id stringlengths 24 24 | title stringclasses 442
values | context stringlengths 151 3.71k | question stringlengths 1 25.7k | answers dict |
|---|---|---|---|---|
5a836cfde60761001a2eb6b1 | Copper | The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper ... | What percentage of copper is used in paper wires? | {
"text": [],
"answer_start": []
} |
5a836cfde60761001a2eb6b2 | Copper | The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper ... | What percentage of copper is forbidden in roofing and plumbing? | {
"text": [],
"answer_start": []
} |
5a836cfde60761001a2eb6b3 | Copper | The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper ... | What percentage of copper is destroyed by industrial machinery? | {
"text": [],
"answer_start": []
} |
5a836cfde60761001a2eb6b4 | Copper | The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper ... | What property does combining copper with brass or bronze eliminate? | {
"text": [],
"answer_start": []
} |
5a836cfde60761001a2eb6b5 | Copper | The major applications of copper are in electrical wires (60%), roofing and plumbing (20%) and industrial machinery (15%). Copper is mostly used as a pure metal, but when a higher hardness is required it is combined with other elements to make an alloy (5% of total use) such as brass and bronze. A small part of copper ... | What is a plant that copper is combined with to create a smoother texture? | {
"text": [],
"answer_start": []
} |
57097747200fba1400368029 | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What is the explanation for copper's capacity for electrical conductivity? | {
"text": [
"The softness"
],
"answer_start": [
0
]
} |
57097747200fba140036802a | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What metal has a higher thermal conductivity than copper? | {
"text": [
"silver"
],
"answer_start": [
161
]
} |
57097747200fba140036802b | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What is the maximum premissible current density in open air of copper? | {
"text": [
"3.1×106 A/m2"
],
"answer_start": [
500
]
} |
57097747200fba140036802c | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What occurs when copper is placed touching another metal? | {
"text": [
"corrosion"
],
"answer_start": [
655
]
} |
57097747200fba140036802d | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What happens to copper if an electrical current gets too high? | {
"text": [
"it begins to heat excessively"
],
"answer_start": [
550
]
} |
5a8342b6e60761001a2eb4d1 | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What is the explanation for copper's capacity for nuclear conductivity? | {
"text": [],
"answer_start": []
} |
5a8342b6e60761001a2eb4d2 | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What metal has an equal thermal conductivity to copper? | {
"text": [],
"answer_start": []
} |
5a8342b6e60761001a2eb4d3 | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What is the only permissible current density in open air of copper? | {
"text": [],
"answer_start": []
} |
5a8342b6e60761001a2eb4d4 | Copper | The softness of copper partly explains its high electrical conductivity (59.6×106 S/m) and thus also high thermal conductivity, which are the second highest (to silver) among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature mostly originates from scatt... | What occurs when copper is placed apart from another metal? | {
"text": [],
"answer_start": []
} |
570978be200fba1400368039 | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | In what form is copper extracted? | {
"text": [
"copper sulfides"
],
"answer_start": [
37
]
} |
570978be200fba140036803a | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | From what types of mines is copper extracted? | {
"text": [
"open pit mines"
],
"answer_start": [
64
]
} |
570978be200fba140036803b | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What percentage of copper do the deposits have that are extracted? | {
"text": [
"0.4 to 1.0% copper"
],
"answer_start": [
120
]
} |
570978be200fba140036803c | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What country was the top producer of copper in 2005? | {
"text": [
"Chile"
],
"answer_start": [
324
]
} |
570978be200fba140036803d | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What is the name of the process being considered in Arizona that allows copper to be recovered? | {
"text": [
"in-situ leach process"
],
"answer_start": [
494
]
} |
5a8356aae60761001a2eb5c9 | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What form is copper hidden? | {
"text": [],
"answer_start": []
} |
5a8356aae60761001a2eb5ca | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What types of mines is copper invisible? | {
"text": [],
"answer_start": []
} |
5a8356aae60761001a2eb5cb | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What percentage of mercury do the deposits have that are extracted? | {
"text": [],
"answer_start": []
} |
5a8356aae60761001a2eb5cc | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What village was the top producer of copper in 2005? | {
"text": [],
"answer_start": []
} |
5a8356aae60761001a2eb5cd | Copper | Most copper is mined or extracted as copper sulfides from large open pit mines in porphyry copper deposits that contain 0.4 to 1.0% copper. Examples include Chuquicamata in Chile, Bingham Canyon Mine in Utah, United States and El Chino Mine in New Mexico, United States. According to the British Geological Survey, in 20... | What is the name of the process being considered in Australia that allows copper to be recovered? | {
"text": [],
"answer_start": []
} |
57097a0bed30961900e841ca | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What percent of copper is recyclable? | {
"text": [
"100%"
],
"answer_start": [
26
]
} |
57097a0bed30961900e841cb | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What percentage of copper that has been mined is still being used today? | {
"text": [
"80%"
],
"answer_start": [
252
]
} |
57097a0bed30961900e841cc | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What other metal besides copper is 100% recyclable? | {
"text": [
"aluminium"
],
"answer_start": [
5
]
} |
57097a0bed30961900e841cd | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | Name a metal that is recycled more often than copper? | {
"text": [
"aluminium"
],
"answer_start": [
220
]
} |
57097a0bed30961900e841ce | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What is the amount of copper in use, per capita, globally? | {
"text": [
"35–55 kg"
],
"answer_start": [
443
]
} |
5a836015e60761001a2eb61d | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What percent of copper is indestructible? | {
"text": [],
"answer_start": []
} |
5a836015e60761001a2eb61e | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What percentage of copper that has been mined is still in the air today? | {
"text": [],
"answer_start": []
} |
5a836015e60761001a2eb61f | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What other wood besides copper is 100% recyclable? | {
"text": [],
"answer_start": []
} |
5a836015e60761001a2eb620 | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What metal is never recycled? | {
"text": [],
"answer_start": []
} |
5a836015e60761001a2eb621 | Copper | Like aluminium, copper is 100% recyclable without any loss of quality, regardless of whether it is in a raw state or contained in a manufactured product. In volume, copper is the third most recycled metal after iron and aluminium. It is estimated that 80% of the copper ever mined is still in use today. According to the... | What is the amount of copper stolen, per capita, globally? | {
"text": [],
"answer_start": []
} |
57097f5e200fba1400368091 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What pigment color is natural to copper? | {
"text": [
"green"
],
"answer_start": [
32
]
} |
57097f5e200fba1400368092 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What property does the final patina on cooper have? | {
"text": [
"highly resistant to atmospheric corrosion"
],
"answer_start": [
153
]
} |
57097f5e200fba1400368093 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What mixture of compounds is the final patina? | {
"text": [
"carbonate and sulfate"
],
"answer_start": [
287
]
} |
57097f5e200fba1400368094 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What conditions effect the mixture of carbonate and sulfate in copper? | {
"text": [
"environmental"
],
"answer_start": [
354
]
} |
57097f5e200fba1400368095 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What can be done to copper to give it a certain look? | {
"text": [
"finished"
],
"answer_start": [
465
]
} |
5a836eeee60761001a2eb6d7 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What pigment color is fake copper? | {
"text": [],
"answer_start": []
} |
5a836eeee60761001a2eb6d8 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What property does the final patina on copper avoid? | {
"text": [],
"answer_start": []
} |
5a836eeee60761001a2eb6d9 | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What separation of compounds is the final patina? | {
"text": [],
"answer_start": []
} |
5a836eeee60761001a2eb6da | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What conditions have no influence on the mixture of carbonate and sulfate in copper? | {
"text": [],
"answer_start": []
} |
5a836eeee60761001a2eb6db | Copper | The metal's distinctive natural green patina has long been coveted by architects and designers. The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. It can be a mixture of carbonate and sulfate compounds i... | What can be done to sugar to give it a certain look? | {
"text": [],
"answer_start": []
} |
57098140200fba14003680cb | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What are copper salts sometimes used for? | {
"text": [
"suicide attempts"
],
"answer_start": [
59
]
} |
57098140200fba14003680cc | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | When ingested in large amounts what does copper salts produce in humans? | {
"text": [
"copper toxicity"
],
"answer_start": [
95
]
} |
57098140200fba14003680cd | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What is the minimum amount of copper rabbits should have in their diet? | {
"text": [
"3 ppm"
],
"answer_start": [
373
]
} |
57098140200fba14003680ce | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What is a major benefit to rabbits having a higher concentration of copper in their diet? | {
"text": [
"growth rates"
],
"answer_start": [
539
]
} |
57098140200fba14003680cf | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What amount of copper salt is toxic in animals? | {
"text": [
"30 mg/kg"
],
"answer_start": [
254
]
} |
5a8371c6e60761001a2eb71b | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What are copper peppers sometimes used for? | {
"text": [],
"answer_start": []
} |
5a8371c6e60761001a2eb71c | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | When ingested in small amounts what does copper salts produce in humans? | {
"text": [],
"answer_start": []
} |
5a8371c6e60761001a2eb71d | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What is the minimum amount of copper dragons should have in their diet? | {
"text": [],
"answer_start": []
} |
5a8371c6e60761001a2eb71e | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What is a major benefit to dragons having a higher concentration of copper in their diet? | {
"text": [],
"answer_start": []
} |
5a8371c6e60761001a2eb71f | Copper | Gram quantities of various copper salts have been taken in suicide attempts and produced acute copper toxicity in humans, possibly due to redox cycling and the generation of reactive oxygen species that damage DNA. Corresponding amounts of copper salts (30 mg/kg) are toxic in animals. A minimum dietary value for health... | What amount of copper salt is toxic in robots? | {
"text": [],
"answer_start": []
} |
5709828fed30961900e84244 | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | When did Britain first use brass? | {
"text": [
"3rd–2nd century BC"
],
"answer_start": [
49
]
} |
5709828fed30961900e84245 | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | Who were the first copper miners in North America? | {
"text": [
"Native Americans"
],
"answer_start": [
133
]
} |
5709828fed30961900e84246 | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | Where was native copper extracted with primitive tools between 800 and 1600? | {
"text": [
"Isle Royale"
],
"answer_start": [
211
]
} |
5709828fed30961900e84247 | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | What country had a strong copper production in 1000 AD | {
"text": [
"Peru"
],
"answer_start": [
340
]
} |
5709828fed30961900e84248 | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | When did commercial production of copper begin? | {
"text": [
"early 20th century"
],
"answer_start": [
548
]
} |
5a836aeee60761001a2eb68b | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | When did Britain ban use of brass? | {
"text": [],
"answer_start": []
} |
5a836aeee60761001a2eb68c | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | Who were the only copper miners in North America? | {
"text": [],
"answer_start": []
} |
5a836aeee60761001a2eb68d | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | Where was native copper hidden with primitive tools between 800 and 1600? | {
"text": [],
"answer_start": []
} |
5a836aeee60761001a2eb68e | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | What country stopped a strong copper production in 1000 AD? | {
"text": [],
"answer_start": []
} |
5a836aeee60761001a2eb68f | Copper | Britain's first use of brass occurred around the 3rd–2nd century BC. In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. Copper metallurgy was flourishing in South Ameri... | When did commercial production of copper end? | {
"text": [],
"answer_start": []
} |
5709844f200fba1400368107 | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | How many isotopes are there of copper? | {
"text": [
"29"
],
"answer_start": [
10
]
} |
5709844f200fba1400368108 | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What are the two stable isotopes of cooper? | {
"text": [
"63Cu and 65Cu"
],
"answer_start": [
33
]
} |
5709844f200fba1400368109 | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | Which isotope makes up about 69% of natural copper? | {
"text": [
"63Cu"
],
"answer_start": [
64
]
} |
5709844f200fba140036810a | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What is the half life of the copper isotope 68mCu? | {
"text": [
"3.8 minutes"
],
"answer_start": [
360
]
} |
5709844f200fba140036810b | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What is the half life of the copper isotope 67Cu? | {
"text": [
"61.83 hours"
],
"answer_start": [
247
]
} |
5a83518ce60761001a2eb56d | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | How many isotopes are missing in copper? | {
"text": [],
"answer_start": []
} |
5a83518ce60761001a2eb56e | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What are the two dangerous isotopes of copper? | {
"text": [],
"answer_start": []
} |
5a83518ce60761001a2eb56f | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | Which isotope makes up about 74% of natural copper? | {
"text": [],
"answer_start": []
} |
5a83518ce60761001a2eb570 | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What is the half life of the supernatural isotope 68mCu? | {
"text": [],
"answer_start": []
} |
5a83518ce60761001a2eb571 | Copper | There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper; they both have a spin of 3⁄2. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours. Seven metastable isotopes have been characterized, with 68mC... | What is the orbital period of the copper isotope 67Cu? | {
"text": [],
"answer_start": []
} |
5709867b200fba1400368143 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What is the alloy of copper and nickel called? | {
"text": [
"cupronickel"
],
"answer_start": [
39
]
} |
5709867b200fba1400368144 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | what is the alloy of copper and nickel used for? | {
"text": [
"low-denomination coins"
],
"answer_start": [
63
]
} |
5709867b200fba1400368145 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What is the metal composition of a US nickel? | {
"text": [
"75% copper and 25% nickel"
],
"answer_start": [
164
]
} |
5709867b200fba1400368146 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What extraordinary property does the alloy made up of 90% copper and 10% nickel possess? | {
"text": [
"resistance to corrosion"
],
"answer_start": [
297
]
} |
5709867b200fba1400368147 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What color is created when the alloys of copper and aluminium are combined? | {
"text": [
"golden"
],
"answer_start": [
439
]
} |
5a836094e60761001a2eb62f | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What is the liquid of copper and nickel called? | {
"text": [],
"answer_start": []
} |
5a836094e60761001a2eb630 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What is the liquid of copper and nickel never used for? | {
"text": [],
"answer_start": []
} |
5a836094e60761001a2eb631 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What is the wood composition of a US nickel? | {
"text": [],
"answer_start": []
} |
5a836094e60761001a2eb632 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What mundane property does the alloy made up of 90% copper and 10% nickel possess? | {
"text": [],
"answer_start": []
} |
5a836094e60761001a2eb633 | Copper | The alloy of copper and nickel, called cupronickel, is used in low-denomination coins, often for the outer cladding. The US 5-cent coin called a nickel consists of 75% copper and 25% nickel and has a homogeneous composition. The alloy consisting of 90% copper and 10% nickel is remarkable for its resistance to corrosion... | What color is created when the alloys of copper and aluminium are apart? | {
"text": [],
"answer_start": []
} |
5709880eed30961900e842a4 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What is the name of the componds that has more than one alcohol functional group? | {
"text": [
"Polyols"
],
"answer_start": [
0
]
} |
5709880eed30961900e842a5 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What are copper salts used to test? | {
"text": [
"reducing sugars"
],
"answer_start": [
155
]
} |
5709880eed30961900e842a6 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | How is the presence of sugar shown by using Benedict's reagent and Fehling's solution? | {
"text": [
"color change"
],
"answer_start": [
277
]
} |
5709880eed30961900e842a7 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What color does the copper salts turn to using Benedict's reagent and Fehling's solution if sugar is present? | {
"text": [
"reddish"
],
"answer_start": [
310
]
} |
5709880eed30961900e842a8 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What does Schweizer's reagent dissolve? | {
"text": [
"cellulose"
],
"answer_start": [
424
]
} |
5a836387e60761001a2eb64d | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What is the name of the compounds that have no alcohol functional group? | {
"text": [],
"answer_start": []
} |
5a836387e60761001a2eb64e | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What are copper salts used to burn? | {
"text": [],
"answer_start": []
} |
5a836387e60761001a2eb64f | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | How is the presence of sugar hidden by using Benedict's reagent and Fehling's solution? | {
"text": [],
"answer_start": []
} |
5a836387e60761001a2eb650 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What color does the copper salts turn to using Benedict's reagent and Fehling's solution if dust is present? | {
"text": [],
"answer_start": []
} |
5a836387e60761001a2eb651 | Copper | Polyols, compounds containing more than one alcohol functional group, generally interact with cupric salts. For example, copper salts are used to test for reducing sugars. Specifically, using Benedict's reagent and Fehling's solution the presence of the sugar is signaled by a color change from blue Cu(II) to reddish co... | What does Schweizer's reagent grow? | {
"text": [],
"answer_start": []
} |
57098a0b200fba140036816b | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | What started about 4000 years after copper smelting was discovered? | {
"text": [
"Alloying copper with tin to make bronze"
],
"answer_start": [
0
]
} |
57098a0b200fba140036816c | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | What are the first datings of Bronze artifacts from the Vinca culture? | {
"text": [
"4500 BC"
],
"answer_start": [
253
]
} |
57098a0b200fba140036816d | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | When did the Bronze Age began in Southeastern Europe? | {
"text": [
"3700–3300 BC"
],
"answer_start": [
390
]
} |
57098a0b200fba140036816e | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | What was the transition between the Neolithic period and the bronze age called? | {
"text": [
"Chalcolithic"
],
"answer_start": [
632
]
} |
57098a0b200fba140036816f | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | What is an alloy of copper and zinc? | {
"text": [
"Brass"
],
"answer_start": [
855
]
} |
5a836761e60761001a2eb677 | Copper | Alloying copper with tin to make bronze was first practiced about 4000 years after the discovery of copper smelting, and about 2000 years after "natural bronze" had come into general use[citation needed]. Bronze artifacts from the Vinča culture date to 4500 BC. Sumerian and Egyptian artifacts of copper and bronze alloy... | What started about 3000 years after copper smelting was discovered? | {
"text": [],
"answer_start": []
} |
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