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NDQ_017859 | the lift off of a rocket is a(n) | a. combined force, b. action force, c. reaction force, d. two of the above | c | Lesson: newtons third law
Action and Reaction:
Newtons third law of motion explains how Jerod starts his skateboard moving. This law states that every action has an equal and opposite reaction. This means that forces always act in pairs. First an action occursJerod pushes against the ground with his foot. Then a react... |
NDQ_017861 | noble gases are the elements in group 17 of the periodic table. | a. true, b. false | b | Lesson: noble gases
What Are Noble Gases:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). All noble gases are colorless and odorless. They a... |
NDQ_017862 | noble gases are nonreactive elements. | a. true, b. false | a | Lesson: noble gases
What Are Noble Gases:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). All noble gases are colorless and odorless. They a... |
NDQ_017863 | noble gases include | a. oxygen, b. nitrogen, c. argon, d. all of the above | c | Lesson: noble gases
What Are Noble Gases:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). All noble gases are colorless and odorless. They a... |
NDQ_017864 | all noble gases are | a. odorless, b. colorless, c. radioactive, d. two of the above | d | Lesson: noble gases
What Are Noble Gases:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). All noble gases are colorless and odorless. They a... |
NDQ_017865 | noble gases have high boiling points. | a. true, b. false | b | Lesson: noble gases
What Are Noble Gases:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). All noble gases are colorless and odorless. They a... |
NDQ_017870 | examples of nonmetals include | a. carbon, b. phosphorus, c. sulfur, d. all of the above | d | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017872 | there are fewer nonmetals than there are elements in any other class. | a. true, b. false | b | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017873 | properties of nonmetals include | a. high boiling point, b. ability to conduct heat, c. dull appearance, d. none of the above | c | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017874 | all nonmetals are very reactive. | a. true, b. false | b | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017877 | nonmetals are located on the right side of the periodic table. | a. true, b. false | a | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017879 | most of the elements that make up the human body are nonmetals. | a. true, b. false | a | Lesson: nonmetals
What Are Nonmetals:
Nonmetals are elements that generally do not conduct electricity. They are one of three classes of elements (the other two classes are metals and metalloids.) Nonmetals are the second largest of the three classes after metals. They are the elements located on the right side of the... |
NDQ_017881 | the fuel used in nuclear power plants is | a. krypton-92, b. barium-141, c. uranium-235, d. none of the above | c | Lesson: nuclear fission
What Is Nuclear Fission:
Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium- 235, like the one pictured in the Fi... |
NDQ_017883 | what is missing from the following nuclear equation for the fissioning of uranium-235? kr + ba + ? + energy 235 141 | a. 1 electron, b. 2 protons, c. 3 neutrons, d. 4 positrons | c | Lesson: nuclear fission
What Is Nuclear Fission:
Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium- 235, like the one pictured in the Fi... |
NDQ_017887 | in a nuclear power plant, the energy from nuclear reactions is used to boil water. | a. true, b. false | a | Lesson: nuclear fission
What Is Nuclear Fission:
Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium- 235, like the one pictured in the Fi... |
NDQ_017888 | nuclear power plants do not produce air pollution. | a. true, b. false | a | Lesson: nuclear fission
What Is Nuclear Fission:
Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium- 235, like the one pictured in the Fi... |
NDQ_017889 | nuclear energy is a renewable energy resource. | a. true, b. false | b | Lesson: nuclear fission
What Is Nuclear Fission:
Nuclear fission is the splitting of the nucleus of a radioactive atom into two smaller nuclei. This type of reaction releases a great deal of energy from a very small amount of matter. Fission of a tiny pellet of radioactive uranium- 235, like the one pictured in the Fi... |
NDQ_017891 | nuclear fusion occurs inside | a. stars, b. planets, c. nuclear power plants, d. two of the above | a | Lesson: nuclear fusion
What Is Nuclear Fusion:
In nuclear fusion, two or more small nuclei combine to form a single, larger nucleus. You can see an example in the Figure 1.1. In this example, nuclei of two hydrogen isotopes (tritium and deuterium) fuse to form a helium nucleus. A neutron and a tremendous amount of ene... |
NDQ_017892 | fusion of two hydrogen nuclei produces | a. a helium nucleus, b. a neutron, c. energy, d. all of the above | d | Lesson: nuclear fusion
What Is Nuclear Fusion:
In nuclear fusion, two or more small nuclei combine to form a single, larger nucleus. You can see an example in the Figure 1.1. In this example, nuclei of two hydrogen isotopes (tritium and deuterium) fuse to form a helium nucleus. A neutron and a tremendous amount of ene... |
NDQ_017894 | nuclear fusion produces dangerous radioactive wastes. | a. true, b. false | b | Lesson: nuclear fusion
What Is Nuclear Fusion:
In nuclear fusion, two or more small nuclei combine to form a single, larger nucleus. You can see an example in the Figure 1.1. In this example, nuclei of two hydrogen isotopes (tritium and deuterium) fuse to form a helium nucleus. A neutron and a tremendous amount of ene... |
NDQ_017896 | the fuel needed for nuclear fusion is plentiful. | a. true, b. false | a | Lesson: nuclear fusion
What Is Nuclear Fusion:
In nuclear fusion, two or more small nuclei combine to form a single, larger nucleus. You can see an example in the Figure 1.1. In this example, nuclei of two hydrogen isotopes (tritium and deuterium) fuse to form a helium nucleus. A neutron and a tremendous amount of ene... |
NDQ_017899 | scientists are a long way from developing the technology needed to use nuclear fusion to produce electricity. | a. true, b. false | a | Lesson: nuclear fusion
What Is Nuclear Fusion:
In nuclear fusion, two or more small nuclei combine to form a single, larger nucleus. You can see an example in the Figure 1.1. In this example, nuclei of two hydrogen isotopes (tritium and deuterium) fuse to form a helium nucleus. A neutron and a tremendous amount of ene... |
NDQ_017903 | nitrogen bases in dna include | a. adenine, b. uracil, c. ribose, d. two of the above | a | Lesson: nucleic acid classification
What Are Nucleic Acids:
Nucleic acids are one of four classes of biochemical compounds. (The other three classes are carbohydrates, proteins, and lipids.) Nucleic acids include RNA (ribonucleic acid) as well as DNA (deoxyribonucleic acid). Both types of nucleic acids contain the ele... |
NDQ_017904 | the backbone of a nucleic acid consists of alternating nitrogen bases. | a. true, b. false | b | Lesson: nucleic acid classification
What Are Nucleic Acids:
Nucleic acids are one of four classes of biochemical compounds. (The other three classes are carbohydrates, proteins, and lipids.) Nucleic acids include RNA (ribonucleic acid) as well as DNA (deoxyribonucleic acid). Both types of nucleic acids contain the ele... |
NDQ_017907 | functions of rna include | a. copying the genetic code in dna, b. carrying the genetic code to the cytoplasm, c. helping to make proteins based on the genetic code, d. all of the above | d | Lesson: nucleic acid classification
What Are Nucleic Acids:
Nucleic acids are one of four classes of biochemical compounds. (The other three classes are carbohydrates, proteins, and lipids.) Nucleic acids include RNA (ribonucleic acid) as well as DNA (deoxyribonucleic acid). Both types of nucleic acids contain the ele... |
NDQ_017908 | dna is found only in the nucleus of cells. | a. true, b. false | a | Lesson: nucleic acid classification
What Are Nucleic Acids:
Nucleic acids are one of four classes of biochemical compounds. (The other three classes are carbohydrates, proteins, and lipids.) Nucleic acids include RNA (ribonucleic acid) as well as DNA (deoxyribonucleic acid). Both types of nucleic acids contain the ele... |
NDQ_017941 | optical instruments include | a. microscopes, b. telescopes, c. cameras, d. all of the above | d | Lesson: optical instruments
Optics and Optical Instruments:
Optics is the study of visible light and the ways it can be used to extend human vision and do other tasks. Knowledge of light was needed for the invention of optical instruments such as microscopes, telescopes, and cameras, in addition to optical fibers. The... |
NDQ_017942 | optical instruments use lenses and mirrors to form images. | a. true, b. false | a | Lesson: optical instruments
Optics and Optical Instruments:
Optics is the study of visible light and the ways it can be used to extend human vision and do other tasks. Knowledge of light was needed for the invention of optical instruments such as microscopes, telescopes, and cameras, in addition to optical fibers. The... |
NDQ_017943 | a compound microscope has | a. two concave lenses, b. two convex lenses, c. one concave lens and one convex lens, d. none of the above | b | Lesson: optical instruments
Optics and Optical Instruments:
Optics is the study of visible light and the ways it can be used to extend human vision and do other tasks. Knowledge of light was needed for the invention of optical instruments such as microscopes, telescopes, and cameras, in addition to optical fibers. The... |
NDQ_017944 | the magnifications of all the lenses of a microscope are added together to yield the overall magnification. | a. true, b. false | b | Lesson: optical instruments
Optics and Optical Instruments:
Optics is the study of visible light and the ways it can be used to extend human vision and do other tasks. Knowledge of light was needed for the invention of optical instruments such as microscopes, telescopes, and cameras, in addition to optical fibers. The... |
NDQ_017946 | the part of a camera that focuses light to form an image is the | a. aperture, b. shutter, c. lens, d. film or sensor | c | Lesson: optical instruments
Optics and Optical Instruments:
Optics is the study of visible light and the ways it can be used to extend human vision and do other tasks. Knowledge of light was needed for the invention of optical instruments such as microscopes, telescopes, and cameras, in addition to optical fibers. The... |
NDQ_017952 | the shape of the path in question 2 is | a. round, b. circular, c. elliptical, d. none of the above | c | Lesson: orbital motion
What Is Orbital Motion:
Earth and many other bodiesincluding asteroids, comets, and the other planetsmove around the sun in curved paths called orbits. Generally, the orbits are elliptical, or oval, in shape. You can see the shape of Earths orbit in the Figure 1.1. Because of the suns relatively... |
NDQ_017953 | objects that have orbital motion include | a. moons, b. satellites, c. asteroids, d. all of the above | d | Lesson: orbital motion
What Is Orbital Motion:
Earth and many other bodiesincluding asteroids, comets, and the other planetsmove around the sun in curved paths called orbits. Generally, the orbits are elliptical, or oval, in shape. You can see the shape of Earths orbit in the Figure 1.1. Because of the suns relatively... |
NDQ_017957 | it takes earth 24 hours to complete each orbit. | a. true, b. false | b | Lesson: orbital motion
What Is Orbital Motion:
Earth and many other bodiesincluding asteroids, comets, and the other planetsmove around the sun in curved paths called orbits. Generally, the orbits are elliptical, or oval, in shape. You can see the shape of Earths orbit in the Figure 1.1. Because of the suns relatively... |
NDQ_017958 | comets do not have orbital motion. | a. true, b. false | b | Lesson: orbital motion
What Is Orbital Motion:
Earth and many other bodiesincluding asteroids, comets, and the other planetsmove around the sun in curved paths called orbits. Generally, the orbits are elliptical, or oval, in shape. You can see the shape of Earths orbit in the Figure 1.1. Because of the suns relatively... |
NDQ_017959 | an object with orbital motion is constantly accelerating. | a. true, b. false | a | Lesson: orbital motion
What Is Orbital Motion:
Earth and many other bodiesincluding asteroids, comets, and the other planetsmove around the sun in curved paths called orbits. Generally, the orbits are elliptical, or oval, in shape. You can see the shape of Earths orbit in the Figure 1.1. Because of the suns relatively... |
NDQ_017971 | which of the following properties characterizes bases? | a. ability to react with metals, b. sour taste, c. bitter taste, d. two of the above | c | Lesson: ph concept
Strength of Acids and Bases:
Acids are ionic compounds that produce positively charged hydrogen ions (H+ ) when dissolved in water. Acids taste sour and react with metals. Bases are ionic compounds that produce negatively charged hydroxide ions (OH ) when dissolved in water. Bases taste bitter and d... |
NDQ_017972 | examples of acids include | a. antacid tablets, b. vinegar, c. drain cleaner, d. all of the above | b | Lesson: ph concept
Strength of Acids and Bases:
Acids are ionic compounds that produce positively charged hydrogen ions (H+ ) when dissolved in water. Acids taste sour and react with metals. Bases are ionic compounds that produce negatively charged hydroxide ions (OH ) when dissolved in water. Bases taste bitter and d... |
NDQ_017973 | the strength of an acid depends on how many hydrogen ions it produces when it dissolves in water. | a. true, b. false | a | Lesson: ph concept
Strength of Acids and Bases:
Acids are ionic compounds that produce positively charged hydrogen ions (H+ ) when dissolved in water. Acids taste sour and react with metals. Bases are ionic compounds that produce negatively charged hydroxide ions (OH ) when dissolved in water. Bases taste bitter and d... |
NDQ_017975 | an example of a weak base is sodium hydroxide. | a. true, b. false | a | Lesson: ph concept
Strength of Acids and Bases:
Acids are ionic compounds that produce positively charged hydrogen ions (H+ ) when dissolved in water. Acids taste sour and react with metals. Bases are ionic compounds that produce negatively charged hydroxide ions (OH ) when dissolved in water. Bases taste bitter and d... |
NDQ_017978 | acidity is the hydrogen ion concentration of a solution. | a. true, b. false | a | Lesson: ph concept
Strength of Acids and Bases:
Acids are ionic compounds that produce positively charged hydrogen ions (H+ ) when dissolved in water. Acids taste sour and react with metals. Bases are ionic compounds that produce negatively charged hydroxide ions (OH ) when dissolved in water. Bases taste bitter and d... |
NDQ_017982 | the reactants of photosynthesis include | a. oxygen, b. chlorophyll, c. carbon dioxide, d. two of the above | a | Lesson: photosynthesis reactions
Food From Light:
Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_017983 | the products of photosynthesis include | a. energy, b. carbon dioxide, c. water, d. oxygen | d | Lesson: photosynthesis reactions
Food From Light:
Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_017986 | photosynthesis changes light energy to chemical energy. | a. true, b. false | a | Lesson: photosynthesis reactions
Food From Light:
Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_017987 | photosynthesis takes place in a single chemical reaction. | a. true, b. false | b | Lesson: photosynthesis reactions
Food From Light:
Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_017988 | organisms that undergo photosynthesis include | a. plants, b. cyanobacteria, c. algae, d. all of the above | d | Lesson: photosynthesis reactions
Food From Light:
Most of the energy used by living things comes either directly or indirectly from the sun. Thats because sunlight provides the energy for photosynthesis. This is the process in which plants and certain other organisms synthesize glucose (C6 H12 O6 ). The process uses c... |
NDQ_018032 | a position-time graph shows how far an object has traveled at any given time since it started moving. | a. true, b. false | a | Lesson: position time graphs
Graphing Position and Time:
The motion of an object can be represented by a position-time graph like Graph 1 in the Figure 1.1. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time. A position-time graph shows how far an objec... |
NDQ_018033 | a position-time graph shows the direction(s) the moving object has traveled relative to the starting position. | a. true, b. false | a | Lesson: position time graphs
Graphing Position and Time:
The motion of an object can be represented by a position-time graph like Graph 1 in the Figure 1.1. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time. A position-time graph shows how far an objec... |
NDQ_018034 | the slope of a position-time graph can be used to find the moving objects | a. velocity, b. position, c. acceleration, d. none of the above | a | Lesson: position time graphs
Graphing Position and Time:
The motion of an object can be represented by a position-time graph like Graph 1 in the Figure 1.1. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time. A position-time graph shows how far an objec... |
NDQ_018036 | the steeper the line on a position-time graph, the faster the objects motion is changing. | a. true, b. false | a | Lesson: position time graphs
Graphing Position and Time:
The motion of an object can be represented by a position-time graph like Graph 1 in the Figure 1.1. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time. A position-time graph shows how far an objec... |
NDQ_018037 | what is the formula for calculating the average velocity of a moving object? | a. average velocity = d/t, b. average velocity = t/d, c. average velocity = d x t, d. average velocity = d + t | a | Lesson: position time graphs
Graphing Position and Time:
The motion of an object can be represented by a position-time graph like Graph 1 in the Figure 1.1. In this type of graph, the y-axis represents position relative to the starting point, and the x-axis represents time. A position-time graph shows how far an objec... |
NDQ_018041 | a person or object may have stored energy because of its | a. shape, b. position, c. velocity, d. two of the above | d | Lesson: potential energy
Stored Energy:
The diver has energy because of her position high above the pool. The type of energy she has is called potential energy. Potential energy is energy that is stored in a person or object. Often, the person or object has potential energy because of its position or shape. Q: What is... |
NDQ_018044 | an objects potential energy due to gravity depends on its | a. weight, b. acceleration, c. height above the ground, d. two of the above | d | Lesson: potential energy
Stored Energy:
The diver has energy because of her position high above the pool. The type of energy she has is called potential energy. Potential energy is energy that is stored in a person or object. Often, the person or object has potential energy because of its position or shape. Q: What is... |
NDQ_018047 | a stretched rubber band has potential energy. | a. true, b. false | a | Lesson: potential energy
Stored Energy:
The diver has energy because of her position high above the pool. The type of energy she has is called potential energy. Potential energy is energy that is stored in a person or object. Often, the person or object has potential energy because of its position or shape. Q: What is... |
NDQ_018048 | food and batteries both contain potential energy. | a. true, b. false | a | Lesson: potential energy
Stored Energy:
The diver has energy because of her position high above the pool. The type of energy she has is called potential energy. Potential energy is energy that is stored in a person or object. Often, the person or object has potential energy because of its position or shape. Q: What is... |
NDQ_018054 | compared with a less powerful device, a more powerful device can do | a. more work in the same time, b. the same work in less time, c. less work in the same time, d. two of the above | d | Lesson: power
What Is Power:
Power is a measure of the amount of work that can be done in a given amount of time. Power can be represented by the equation: Power = Work Time In this equation, work is measured in joules (J) and time is measured in seconds (s), so power is expressed in joules per second (J/s). This is t... |
NDQ_018056 | if a microwave does 3000 j of work in 3 seconds, its power is | a. 9000 w, b. 3300 w, c. 2700 w, d. 1000 w | d | Lesson: power
What Is Power:
Power is a measure of the amount of work that can be done in a given amount of time. Power can be represented by the equation: Power = Work Time In this equation, work is measured in joules (J) and time is measured in seconds (s), so power is expressed in joules per second (J/s). This is t... |
NDQ_018057 | if you know power and time, you can calculate work with the equation | a. work = power x time, b. work = power/time, c. work = time/power, d. none of the above | a | Lesson: power
What Is Power:
Power is a measure of the amount of work that can be done in a given amount of time. Power can be represented by the equation: Power = Work Time In this equation, work is measured in joules (J) and time is measured in seconds (s), so power is expressed in joules per second (J/s). This is t... |
NDQ_018072 | to hit the bulls eye of a target, you have to aim an arrow | a. at the center of the bulls eye, b. above the bulls eye, c. below the bulls eye, d. to one side of the bulls eye | b | Lesson: projectile motion
Combining Forces:
When the archer releases the bowstring, the arrow will be flung forward toward the top of the target where shes aiming. But another force will also act on the arrow in a different direction. The other force is gravity, and it will pull the arrow down toward Earth. The two fo... |
NDQ_018074 | examples of objects that have projectile motion include | a. moons of planets, b. artificial satellites, c. paintballs, d. all of the above | c | Lesson: projectile motion
Combining Forces:
When the archer releases the bowstring, the arrow will be flung forward toward the top of the target where shes aiming. But another force will also act on the arrow in a different direction. The other force is gravity, and it will pull the arrow down toward Earth. The two fo... |
NDQ_018075 | when an arrow is shot from a bow, forces acting on the arrow include the | a. elastic force of the bow, b. force of gravity, c. force of friction, d. all of the above | d | Lesson: projectile motion
Combining Forces:
When the archer releases the bowstring, the arrow will be flung forward toward the top of the target where shes aiming. But another force will also act on the arrow in a different direction. The other force is gravity, and it will pull the arrow down toward Earth. The two fo... |
NDQ_018077 | a cannonball shot from a cannon has projectile motion. | a. true, b. false | a | Lesson: projectile motion
Combining Forces:
When the archer releases the bowstring, the arrow will be flung forward toward the top of the target where shes aiming. But another force will also act on the arrow in a different direction. The other force is gravity, and it will pull the arrow down toward Earth. The two fo... |
NDQ_018078 | an object with projectile motion constantly changes direction. | a. true, b. false | a | Lesson: projectile motion
Combining Forces:
When the archer releases the bowstring, the arrow will be flung forward toward the top of the target where shes aiming. But another force will also act on the arrow in a different direction. The other force is gravity, and it will pull the arrow down toward Earth. The two fo... |
NDQ_018081 | an example of an acid is hcl. | a. true, b. false | a | Lesson: properties of acids
What Are Acids:
Acids are ionic compounds that produce positive hydrogen ions (H+ ) when dissolved in water. Ionic compounds are compounds that contain positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles by gaining ... |
NDQ_018082 | all acids taste sour. | a. true, b. false | a | Lesson: properties of acids
What Are Acids:
Acids are ionic compounds that produce positive hydrogen ions (H+ ) when dissolved in water. Ionic compounds are compounds that contain positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles by gaining ... |
NDQ_018084 | when acids react with metals, they produce | a. hydrogen gas, b. a salt, c. a base, d. two of the above | d | Lesson: properties of acids
What Are Acids:
Acids are ionic compounds that produce positive hydrogen ions (H+ ) when dissolved in water. Ionic compounds are compounds that contain positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles by gaining ... |
NDQ_018087 | which statement about ph is true? | a. a neutral solution has a ph of 0, b. an acid has a ph greater than 7, c. an acid has a ph less than 7, d. a very weak acid has a ph close to 0 | c | Lesson: properties of acids
What Are Acids:
Acids are ionic compounds that produce positive hydrogen ions (H+ ) when dissolved in water. Ionic compounds are compounds that contain positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles by gaining ... |
NDQ_018089 | litmus paper is the only indicator of acids. | a. true, b. false | b | Lesson: properties of acids
What Are Acids:
Acids are ionic compounds that produce positive hydrogen ions (H+ ) when dissolved in water. Ionic compounds are compounds that contain positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles by gaining ... |
NDQ_018092 | an example of a base is sodium hydroxide (naoh). | a. true, b. false | a | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018093 | bases feel slippery to the touch. | a. true, b. false | a | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018095 | bases can react with metals. | a. true, b. false | b | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018096 | bases turn red litmus paper blue. | a. true, b. false | a | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018098 | bases are used to make | a. soaps, b. cleaning products, c. concrete, d. all of the above | d | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018099 | the strongest bases have ph values close to | a. 0, b. 5, c. 7, d. 14 | d | Lesson: properties of bases
What Are Bases:
Bases are ionic compounds that produce negative hydroxide ions (OH ) when dissolved in water. An ionic com- pound contains positive metal ions and negative nonmetal ions held together by ionic bonds. (Ions are atoms that have become charged particles because they have either... |
NDQ_018101 | properties of electromagnetic waves include | a. speed, b. frequency, c. wavelength, d. all of the above | d | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018102 | all electromagnetic waves travel at the same speed through space. | a. true, b. false | a | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018105 | higher-frequency electromagnetic waves have less energy. | a. true, b. false | b | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018106 | some electromagnetic waves have wavelengths shorter than the diameter of an atom. | a. true, b. false | a | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018107 | all electromagnetic waves have frequencies of less than 1000 waves per second. | a. true, b. false | b | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018108 | the highest-frequency electromagnetic waves | a. include visible light, b. are harmful, c. have the longest wavelengths, d. two of the above | b | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018109 | which equation shows the relationship of wave speed to wavelength and wave frequency? | a. speed = wavelength x frequency, b. speed = wavelength/frequency, c. speed = frequency/wavelength, d. none of the above | a | Lesson: properties of electromagnetic waves
Speed of Electromagnetic Waves:
All electromagnetic waves travel at the same speed through empty space. That speed, called the speed of light, is about 300 million meters per second (3.0 x 108 m/s). Nothing else in the universe is known to travel this fast. The sun is about ... |
NDQ_018121 | proteins are the most numerous and diverse biochemical compounds. | a. true, b. false | a | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018122 | elements that make up proteins include | a. nitrogen, b. phosphorus, c. hemoglobin, d. two of the above | a | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018125 | there are hundreds of different amino acids. | a. true, b. false | b | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018126 | what determines the shape of a protein? | a. amino acid sequence of each chain, b. folding of each amino acid chain, c. number of amino acid chains, d. all of the above | d | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018128 | examples of proteins by function include | a. hormones, b. antibodies, c. enzymes, d. all of the above | d | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018129 | some proteins carry other materials in the blood. | a. true, b. false | a | Lesson: protein classification
Meet the Proteins:
Hemoglobin is a compound in the class of compounds called proteins. Proteins are one of four classes of biochemi- cal compounds, which are compounds in living things. (The other three classes are carbohydrates, lipids, and nucleic acids.) Proteins contain carbon, hydro... |
NDQ_018131 | protons are one of three main types of particles that make up atoms. | a. true, b. false | a | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018132 | protons are found only in the atomic nucleus. | a. true, b. false | a | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018133 | which of the following correctly describes a proton? | a. it has an electrical charge of +2, b. it has a mass of 1 mg, c. it has a diameter of 1.7 x 10-27 km, d. none of the above | d | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018134 | in the sun, protons of hydrogen atoms | a. fission to form energy, b. fuse to form helium nuclei, c. melt to form light, d. none of the above | b | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018135 | the atoms of different elements have | a. different numbers of protons, b. different types of protons, c. the same number of protons, d. two of the above | a | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018137 | what are protons made of? | a. gluons, b. neutrons, c. quarks, d. two of the above | d | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018139 | protons have less mass than electrons. | a. true, b. false | b | Lesson: protons
What Is a Proton:
A proton is one of three main particles that make up the atom. The other two particles are the neutron and electron. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass o... |
NDQ_018144 | a flagpole pulley is a | a. fixed pulley, b. moveable pulley, c. compound pulley, d. none of the above | a | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
NDQ_018145 | the ideal mechanical advantage of a pulley is equal to the number of rope segments pulling up on the load. | a. true, b. false | a | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
NDQ_018146 | a moveable pulley changes the direction of the input force. | a. true, b. false | b | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
NDQ_018147 | a zip-line pulley is a moveable pulley. | a. true, b. false | a | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
NDQ_018148 | which type(s) of pulley can have a mechanical advantage greater than 2? | a. fixed pulley, b. moveable pulley, c. compound pulley, d. two of the above | c | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
NDQ_018149 | all pulleys increase the force applied to the pulley. | a. true, b. false | b | Lesson: pulley
What Is a Pulley:
A pulley is a simple machine that consists of a rope and grooved wheel. The rope fits into the groove in the wheel, and pulling on the rope turns the wheel. Pulleys are generally used to lift objects, especially heavy objects. The object lifted by a pulley is called the load. The force... |
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