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NDQ_016017 | Hemoglobin is a protein that fights infections in the blood. | a. true, b. false | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016018 | The most abundant biochemical compound is cellulose. | a. true, b. false | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016019 | Hemoglobin transports oxygen through the blood. | a. true, b. false | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016020 | Muscle tissues are composed mainly of fatty acids. | a. true, b. false | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016021 | Organisms use lipids mainly to store energy. | a. true, b. false | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016022 | There are two main types of nucleic acids. | a. true, b. false | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016023 | long carbon chains found in lipids | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | f | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016024 | class of biochemical compounds that includes oils | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016025 | general name given to biochemical polymers | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | e | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016026 | class of biochemical compounds that includes DNA | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | d | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016027 | building blocks of proteins | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | g | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016028 | class of biochemical compounds that includes cellulose | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016029 | class of biochemical compounds that includes enzymes | a. carbohydrates, b. lipids, c. proteins, d. nucleic acids, e. macromolecules, f. fatty acids, g. amino acids | c | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016030 | Which of the following is one of the four main classes of biochemical compounds? | a. sugars, b. starches, c. cellulose, d. carbohydrates | d | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016031 | All biochemical compounds include carbon, hydrogen, and | a. sulfur, b. oxygen, c. nitrogen, d. phosphorus | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016032 | Organisms use carbohydrates mainly for | a. energy, b. cell membranes, c. hormones, d. antibodies | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016033 | The function of a given protein depends on its | a. overall shape, b. sequence of amino acids, c. number of amino acid chains, d. all of the above | d | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016034 | Which statement about saturated fatty acids is true? | a. They have only single bonds between carbon atoms, b. They are used by plants to store energy, c. They make up lipids known as oils, d. They are always in the liquid state | a | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016035 | Nitrogen bases found in both DNA and RNA include | a. glycine, b. adenine, c. thymine, d. uracil | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016036 | Which of the following is a function of RNA? | a. fighting infections, b. reading the genetic code, c. carrying substances in the blood, d. all of the above | b | Lesson: carbon and living things
Biochemical Compounds:
A biochemical compound is any carbon-based compound found in living things. Like hydrocarbons, all biochemi- cal compounds contain hydrogen as well as carbon. However, biochemical compounds also contain other elements, such as oxygen and nitrogen. Almost all bioc... |
NDQ_016037 | Reactants in cellular respiration include | a. oxygen, b. water, c. carbon dioxide, d. two of the above | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016038 | All organisms make food by photosynthesis. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016039 | The synthesis of glucose requires carbon dioxide. | a. true, b. false | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016040 | The human enzyme named pepsin catalyzes the digestion of | a. nucleic acids, b. fatty acids, c. proteins, d. sugars | c | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016041 | Insect-catching plants such as pitcher plants obtain glucose from insects. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016042 | The compound that cells break down to release energy is | a. chlorophyll, b. carbon dioxide, c. water, d. glucose | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016043 | Energy for photosynthesis comes from | a. water, b. soil, c. light, d. chemicals | c | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016044 | Chemical reactions provide living cells with energy. | a. true, b. false | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016045 | Photosynthesis is an exothermic, or energy-releasing, process. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016046 | Which equation correctly represents photosynthesis? | a. C6 H12 O6 + 6O2 + energy 6CO2 + 6H2 O, b. 6CO2 + 6O2 + energy C6 H12 O6 + 6H2 O, c. C6 H12 O6 + 6CO2 + energy 6O2 + 6H2 O, d. 6CO2 + 6H2 O + energy C6 H12 O6 + 6O2 | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016047 | The overall chemical reaction for photosynthesis is represented by the equation: C6 H12 O6 + 6O2 6CO2 | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016050 | Products of cellular respiration include many small, energy-storing molecules. | a. true, b. false | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016051 | Cellular respiration takes place only in organisms that cannot make their own food. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016054 | The process of cellular respiration requires carbon dioxide. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016056 | One of the products of cellular respiration is oxygen. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016057 | All living things need energy just to stay alive. | a. true, b. false | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016059 | Cellular respiration is an endothermic, or energy-absorbing, process. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016061 | Only plants can carry out photosynthesis. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016064 | Cellular respiration occurs in all living cells | a. true, b. false | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016065 | One of the products of cellular respiration is oxygen. | a. true, b. false | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016069 | process in which cells break down glucose and release energy | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016070 | any chemical reaction that takes place in living things | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | b | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016071 | protein that speeds up biochemical reactions | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | g | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016072 | byproduct of photosynthesis | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | c | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016073 | compound that cells use for energy | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | e | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016074 | pigment that captures light energy | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | f | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016075 | process in which certain organisms make glucose | a. photosynthesis, b. biochemical reaction, c. oxygen, d. cellular respiration, e. glucose, f. chlorophyll, g. enzyme | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016076 | All living things need | a. carbon dioxide, b. sunlight, c. energy, d. two of the above | c | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016077 | Reactants in photosynthesis include | a. chlorophyll, b. oxygen, c. glucose, d. water | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016078 | Types of organisms that make their own glucose include | a. algae, b. plants, c. cyanobacteria, d. all of the above | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016079 | All organisms that undergo photosynthesis contain | a. pepsin, b. amylase, c. chlorophyll, d. two of the above | c | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016080 | Cellular respiration releases some energy in the form of | a. heat, b. light, c. motion, d. electricity | a | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016081 | Amylase catalyzes the breakdown of | a. lipids, b. proteins, c. nucleic acids, d. complex carbohydrates | d | Lesson: biochemical reactions
Photosynthesis:
Most of the energy used by living things comes either directly or indirectly from the sun. Sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms (see Figure 9.26) synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_016082 | acceleration always refers to a(n) | a. increase in speed, b. change in speed, c. change in direction, d. change in velocity | d | Lesson: acceleration
Defining Acceleration:
Acceleration is a measure of the change in velocity of a moving object. It measures the rate at which velocity changes. Velocity, in turn, is a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both... |
NDQ_016084 | acceleration is a vector. | a. true, b. false | a | Lesson: acceleration
Defining Acceleration:
Acceleration is a measure of the change in velocity of a moving object. It measures the rate at which velocity changes. Velocity, in turn, is a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both... |
NDQ_016085 | a change in direction without a change in speed is called velocity. | a. true, b. false | b | Lesson: acceleration
Defining Acceleration:
Acceleration is a measure of the change in velocity of a moving object. It measures the rate at which velocity changes. Velocity, in turn, is a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both... |
NDQ_016086 | acceleration can never be negative. | a. true, b. false | b | Lesson: acceleration
Defining Acceleration:
Acceleration is a measure of the change in velocity of a moving object. It measures the rate at which velocity changes. Velocity, in turn, is a measure of the speed and direction of motion, so a change in velocity may reflect a change in speed, a change in direction, or both... |
NDQ_016096 | a heavier object always falls to the ground more quickly than a lighter object. | a. true, b. false | b | Lesson: acceleration due to gravity
Speeding up While Falling Down:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity c... |
NDQ_016097 | what is the velocity of an object that has been falling freely in a vacuum for 4 seconds? | a. 9.8 m/s, b. 10.1 m/s, c. 19.6 m/s, d. 39.2 m/s | d | Lesson: acceleration due to gravity
Speeding up While Falling Down:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity c... |
NDQ_016099 | objects fall toward earth at a constant rate of speed. | a. true, b. false | b | Lesson: acceleration due to gravity
Speeding up While Falling Down:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity c... |
NDQ_016100 | an object will experience more air resistance when it falls if it has greater | a. mass, b. weight, c. gravity, d. surface area | d | Lesson: acceleration due to gravity
Speeding up While Falling Down:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity c... |
NDQ_016101 | objects with different masses have the same gravitational force acting on them. | a. true, b. false | b | Lesson: acceleration due to gravity
Speeding up While Falling Down:
Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity c... |
NDQ_016104 | if a measurement is precise, it must also be accurate. | a. true, b. false | b | Lesson: accuracy and precision
Accuracy:
The accuracy of a measurement is how close the measurement is to the true value. If you were to hit four different golf balls toward an over-sized hole, all of them might land in the hole. These shots would all be accurate because they all landed in the hole. This is illustrate... |
NDQ_016105 | only accurate measurements are precise. | a. true, b. false | b | Lesson: accuracy and precision
Accuracy:
The accuracy of a measurement is how close the measurement is to the true value. If you were to hit four different golf balls toward an over-sized hole, all of them might land in the hole. These shots would all be accurate because they all landed in the hole. This is illustrate... |
NDQ_016109 | which set of measurements best represents precision if the true value is 6.80 kg? | a. 6.80 kg, 6.70 kg, and 6.90 kg, b. 6.75 kg, 6.80 kg, and 6.85 kg, c. 5.80 kg, 6.80 kg, and 7.80 kg, d. 6.10 kg, 5.99 kg, and 6.11 kg | d | Lesson: accuracy and precision
Accuracy:
The accuracy of a measurement is how close the measurement is to the true value. If you were to hit four different golf balls toward an over-sized hole, all of them might land in the hole. These shots would all be accurate because they all landed in the hole. This is illustrate... |
NDQ_016110 | which set of measurements best represents accuracy if the true value is 6.80 kg? | a. 6.80 kg, 6.70 kg, and 6.90 kg, b. 6.75 kg, 6.80 kg, and 6.85 kg, c. 5.80 kg, 6.80 kg, and 7.80 kg, d. 6.10 kg, 5.99 kg, and 6.11 kg | b | Lesson: accuracy and precision
Accuracy:
The accuracy of a measurement is how close the measurement is to the true value. If you were to hit four different golf balls toward an over-sized hole, all of them might land in the hole. These shots would all be accurate because they all landed in the hole. This is illustrate... |
NDQ_016112 | pure water is an example of a neutral substance. | a. true, b. false | a | Lesson: acid base neutralization
Acids Bases and Ions:
An acid is a compound that produces positive hydrogen ions (H+ ) and negative nonmetal ions when it dissolves in water. (Ions are atoms that have become charged by losing or gaining electrons.) Hydrochloric acid (HCl) is an example of an acid. When it dissolves in... |
NDQ_016113 | when an acid dissolves in water, it produces | a. positive hydrogen ions, b. negative nonmetal ions, c. negative metal ions, d. two of the above | d | Lesson: acid base neutralization
Acids Bases and Ions:
An acid is a compound that produces positive hydrogen ions (H+ ) and negative nonmetal ions when it dissolves in water. (Ions are atoms that have become charged by losing or gaining electrons.) Hydrochloric acid (HCl) is an example of an acid. When it dissolves in... |
NDQ_016114 | when a base dissolves in water, it produces | a. positive hydroxide ions, b. positive metal ions, c. negative nonmetal ions, d. two of the above | b | Lesson: acid base neutralization
Acids Bases and Ions:
An acid is a compound that produces positive hydrogen ions (H+ ) and negative nonmetal ions when it dissolves in water. (Ions are atoms that have become charged by losing or gaining electrons.) Hydrochloric acid (HCl) is an example of an acid. When it dissolves in... |
NDQ_016119 | the reaction of hydrochloric acid and calcium carbonate produces | a. water, b. calcium chloride, c. carbon dioxide, d. all of the above | d | Lesson: acid base neutralization
Acids Bases and Ions:
An acid is a compound that produces positive hydrogen ions (H+ ) and negative nonmetal ions when it dissolves in water. (Ions are atoms that have become charged by losing or gaining electrons.) Hydrochloric acid (HCl) is an example of an acid. When it dissolves in... |
NDQ_016123 | only endothermic reactions require activation energy. | a. true, b. false | b | Lesson: activation energy
Getting Started:
Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning... |
NDQ_016125 | the activation energy needed to start combustion in a car engine comes from | a. the gasoline, b. a spark plug, c. a piston, d. the key | b | Lesson: activation energy
Getting Started:
Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning... |
NDQ_016126 | a chemical reaction will not occur unless reactants are moving. | a. true, b. false | a | Lesson: activation energy
Getting Started:
Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning... |
NDQ_016127 | all chemical reactions need a constant input of energy to continue. | a. true, b. false | b | Lesson: activation energy
Getting Started:
Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning... |
NDQ_016128 | exothermic reactions always need less activation energy than endothermic reactions. | a. true, b. false | b | Lesson: activation energy
Getting Started:
Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy. For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning... |
NDQ_016143 | all of the following are alkaline earth metals except | a. barium, b. sodium, c. calcium, d. magnesium | b | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016144 | properties of alkaline earth metals include | a. gray or silver color, b. low density, c. softness, d. all of the above | d | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016145 | all alkaline earth metals have three valence electrons. | a. true, b. false | b | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016146 | alkaline earth metals are the most reactive metals. | a. true, b. false | b | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016147 | alkaline earth metals never exist as pure substances in nature. | a. true, b. false | a | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016150 | diets that are too low in calcium may lead to | a. rickets, b. osteoporosis, c. bone fractures, d. all of the above | d | Lesson: alkaline earth metals
The Second Group:
Barium (Ba) is one of six elements in group 2 of the periodic table, which is shown in Figure 1.1. Elements in this group are called alkaline Earth metals. These metals are silver or gray in color. They are relatively soft and low in density, although not as soft and lig... |
NDQ_016153 | alloys consist only of metallic elements. | a. true, b. false | b | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016154 | most metal objects are made of alloys rather than pure metals. | a. true, b. false | a | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016155 | which of the following is not an alloy? | a. chromium, b. bronze, c. brass, d. steel | a | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016157 | the alloy called stainless steel consists of | a. iron, b. carbon, c. nickel, d. all of the above | d | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016159 | the first alloy ever made was | a. sterling silver, b. steel, c. brass, d. bronze | d | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016160 | brass is an alloy that is used for doorknobs and plumbing fixtures. | a. true, b. false | a | Lesson: alloys
What Are Alloys:
An alloy is a mixture of a metal with one or more other elements. The other elements may be metals, nonmetals, or both. An alloy is formed by melting a metal and dissolving the other elements in it. The molten solution is then allowed to cool and harden. Alloys generally have more usefu... |
NDQ_016165 | an alpha particle is a | a. packet of energy, b. single electron, c. helium nucleus, d. none of the above | c | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016166 | what does the following nuclear symbol represent? | a. alpha particle, b. helium atom, c. helium ion, d. none of the above | a | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016167 | in the nuclear symbol 6 c, the superscript represents the | a. atomic number, b. mass number, c. valence number, d. group number | b | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016168 | in the following nuclear equation for alpha decay, what is the missing subscript that will balance the equation? th + 42 he + energy 238 234 | a. 94, b. 92, c. 90, d. 88 | c | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016169 | an alpha particle consists of one proton and one neutron. | a. true, b. false | b | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016170 | alpha decay is the least dangerous type of radioactive decay. | a. true, b. false | a | Lesson: alpha decay
Why Some Nuclei Decay:
Radioactive elements and isotopes have unstable nuclei. To become more stable, the nuclei undergo radioactive decay. In radioactive decay, the nuclei give off, or emit, radiation in the form of energy and often particles as well. There are several types of radioactive decay, ... |
NDQ_016182 | archimedes was a greek mathematician who lived more than 2000 years ago. | a. true, b. false | a | Lesson: archimedes law
Archimedes Takes a Bath:
Did you ever notice when you get into a bathtub of water that the level of the water rises? More than 2000 years ago, a Greek mathematician named Archimedes noticed the same thing. He observed that both a body and the water in a tub cant occupy the same space at the same... |
NDQ_016185 | archimedes determined that the volume of water displaced by an object placed in the water is equal to the objects | a. weight, b. volume, c. mass, d. density | b | Lesson: archimedes law
Archimedes Takes a Bath:
Did you ever notice when you get into a bathtub of water that the level of the water rises? More than 2000 years ago, a Greek mathematician named Archimedes noticed the same thing. He observed that both a body and the water in a tub cant occupy the same space at the same... |
NDQ_016186 | a bigger object displaces less water than a smaller object. | a. true, b. false | b | Lesson: archimedes law
Archimedes Takes a Bath:
Did you ever notice when you get into a bathtub of water that the level of the water rises? More than 2000 years ago, a Greek mathematician named Archimedes noticed the same thing. He observed that both a body and the water in a tub cant occupy the same space at the same... |
NDQ_016188 | according to archimedes law, the buoyant force acting on an object equals the | a. weight of the object, b. weight of the displaced fluid, c. volume of the object, d. volume of the displaced fluid | b | Lesson: archimedes law
Archimedes Takes a Bath:
Did you ever notice when you get into a bathtub of water that the level of the water rises? More than 2000 years ago, a Greek mathematician named Archimedes noticed the same thing. He observed that both a body and the water in a tub cant occupy the same space at the same... |
NDQ_016189 | archimedes law explains why some very heavy objects can float on water. | a. true, b. false | a | Lesson: archimedes law
Archimedes Takes a Bath:
Did you ever notice when you get into a bathtub of water that the level of the water rises? More than 2000 years ago, a Greek mathematician named Archimedes noticed the same thing. He observed that both a body and the water in a tub cant occupy the same space at the same... |
NDQ_016196 | how does an incandescent light bulb produce visible light? | a. the bulbs filament gets so hot that it glows, b. gas inside the bulb gives off visible light, c. electricity excites neon electrons in the bulb, d. two of the above | a | Lesson: artificial light
Turn on the Lights:
If youre like most people, you dont give it a thought when you flick a switch to turn on a lightat least not until the power goes out and youre left in the dark! When you flick on a light switch, electricity normally flows through the light, and some type of light bulb conv... |
NDQ_016197 | in a fluorescent light bulb, mercury gas gives off visible light. | a. true, b. false | b | Lesson: artificial light
Turn on the Lights:
If youre like most people, you dont give it a thought when you flick a switch to turn on a lightat least not until the power goes out and youre left in the dark! When you flick on a light switch, electricity normally flows through the light, and some type of light bulb conv... |
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