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NDQ_016758 | the average of a set of values is also called the mode. | a. true, b. false | b | Lesson: descriptive statistics
Using Statistics to Describe a Sample:
The girls in the picture above make up a small samplethere are only four of them. In scientific investigations, samples may include hundreds or even thousands of people or other objects of study. Especially when samples are very large, its important... |
NDQ_016760 | the mode of the set of measurements in question 8 is | a. 24.35 cm, b. 22.51 cm, c. 23.43 cm, d. 20.98 cm | d | Lesson: descriptive statistics
Using Statistics to Describe a Sample:
The girls in the picture above make up a small samplethere are only four of them. In scientific investigations, samples may include hundreds or even thousands of people or other objects of study. Especially when samples are very large, its important... |
NDQ_016772 | terms used to describe relative direction include | a. in, b. up, c. sideways, d. all of the above | d | Lesson: direction
Introducing Direction:
Direction can be described in relative terms, such as up, down, in, out, left, right, forward, backward, or sideways. Direction can also be described with the cardinal directions: north, south, east, or west. On maps, cardinal directions are indicated with a compass rose. You c... |
NDQ_016775 | the direction of motion is a vector. | a. true, b. false | b | Lesson: direction
Introducing Direction:
Direction can be described in relative terms, such as up, down, in, out, left, right, forward, backward, or sideways. Direction can also be described with the cardinal directions: north, south, east, or west. On maps, cardinal directions are indicated with a compass rose. You c... |
NDQ_016780 | if you are facing north, then east is to your | a. left, b. right, c. back, d. none of the above | b | Lesson: direction
Introducing Direction:
Direction can be described in relative terms, such as up, down, in, out, left, right, forward, backward, or sideways. Direction can also be described with the cardinal directions: north, south, east, or west. On maps, cardinal directions are indicated with a compass rose. You c... |
NDQ_016794 | english units of distance include the | a. mile, b. square mile, c. mile per hour, d. all of the above | a | Lesson: distance
What Is Distance:
Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
SI Unit for Distance:
The SI unit for distance is the meter (m). Sho... |
NDQ_016797 | a millimeter is longer than a centimeter. | a. true, b. false | b | Lesson: distance
What Is Distance:
Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
SI Unit for Distance:
The SI unit for distance is the meter (m). Sho... |
NDQ_016798 | a yard is closest in distance to a | a. millimeter, b. centimeter, c. kilometer, d. meter | d | Lesson: distance
What Is Distance:
Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
SI Unit for Distance:
The SI unit for distance is the meter (m). Sho... |
NDQ_016800 | to measure distance in si units, you could use a meter stick. | a. true, b. false | a | Lesson: distance
What Is Distance:
Distance is the length of the route between two points. The distance of a race, for example, is the length of the track between the starting and finishing lines. In a 100-meter sprint, that distance is 100 meters.
SI Unit for Distance:
The SI unit for distance is the meter (m). Sho... |
NDQ_016803 | the doppler effect can occur when the | a. sound source is moving and the listener is stationary, b. listener is moving and the sound source is stationary, c. sound source and listener are moving together, d. two of the above | d | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016804 | sound waves from a police car siren move away from the car in all directions. | a. true, b. false | a | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016805 | sound waves that are closer together have a lower frequency. | a. true, b. false | b | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016806 | as the frequency of sound waves gets lower, a listener perceives the sound to have a higher pitch. | a. true, b. false | b | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016807 | a police car is speeding north with its siren blaring. the sound waves from the siren increase in frequency | a. north of the car, b. south of the car, c. in all directions around the car, d. none of the above | a | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016808 | if you are standing a few blocks north of the police car in question 6, how does its siren sound to you as the car gets closer to your location? | a. the sirens pitch gets higher, b. the sirens pitch gets lower, c. the sirens pitch gets lower and then higher, d. the sirens pitch does not change | a | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016810 | after the police car in question 6 passes your location, how does the siren sound to you? | a. the sirens pitch gets higher, b. the sirens pitch gets lower, c. the sirens pitch gets lower and then higher, d. the sirens pitch does not change | b | Lesson: doppler effect
What Is the Doppler Effect:
The Doppler effect is a change in the frequency of sound waves that occurs when the source of the sound waves is moving relative to a stationary listener. (It can also occur when the sound source is stationary and the listener is moving.) The Figure 1.1 shows how the ... |
NDQ_016813 | which shape of magnet does magnet earth resemble? | a. horseshoe magnet, b. bar magnet, c. disc magnet, d. none of the above | b | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016815 | the place generally referred to as earths magnetic north pole is located closest to | a. 90 degrees north latitude, b. 80 degrees north latitude, c. 70 degrees north latitude, d. 60 degrees north latitude | b | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016816 | earth has two north poles and two south poles. | a. true, b. false | a | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016818 | which of the following statements about earths magnetic field is false? | a. it extends outward from earth in all directions, b. it is strongest at the equator, c. its lines of magnetic force converge at the poles, d. none of the above | b | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016819 | a compass needle always points to earths geographic north pole. | a. true, b. false | b | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016820 | the like poles of two magnets always attract each other. | a. true, b. false | b | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016821 | earths magnetic field is a huge region. | a. true, b. false | a | Lesson: earth as a magnet
Earths Magnetic Poles:
Imagine a huge bar magnet passing through Earths axis, as in the Figure 1.1. This is a good representation of Earth as a magnet. Like a bar magnet, Earth has north and south magnetic poles. A magnetic pole is the north or south end of a magnet, where the magnet exerts t... |
NDQ_016823 | all machines make work easier. | a. true, b. false | a | Lesson: efficiency
Machines and Friction:
A dolly is a machine because it changes a force to make work easier. What is work? In physics, work is defined as the use of force to move an object over a distance. It is represented by the equation: Work = Force x Distance All machines make work easier, but they dont increas... |
NDQ_016824 | you can get more work out of a machine than you put into it. | a. true, b. false | b | Lesson: efficiency
Machines and Friction:
A dolly is a machine because it changes a force to make work easier. What is work? In physics, work is defined as the use of force to move an object over a distance. It is represented by the equation: Work = Force x Distance All machines make work easier, but they dont increas... |
NDQ_016827 | the percent of the work put into a machine (input work) that is actually used to do work (output work) is a measure of the machines | a. power, b. efficiency, c. mechanical advantage, d. none of the above | b | Lesson: efficiency
Machines and Friction:
A dolly is a machine because it changes a force to make work easier. What is work? In physics, work is defined as the use of force to move an object over a distance. It is represented by the equation: Work = Force x Distance All machines make work easier, but they dont increas... |
NDQ_016829 | which equation is used to calculate the efficiency of a machine? | a. efficiency = input distance/output distance x 100%, b. efficiency = input force/output force x 100%, c. efficiency = input work/output work x 100%, d. none of the above | d | Lesson: efficiency
Machines and Friction:
A dolly is a machine because it changes a force to make work easier. What is work? In physics, work is defined as the use of force to move an object over a distance. It is represented by the equation: Work = Force x Distance All machines make work easier, but they dont increas... |
NDQ_016833 | newtons law of gravity was accepted for more than 200 years. | a. true, b. false | a | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016835 | newtons law of gravity explains why gravity occurs. | a. true, b. false | b | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016836 | einsteins concept of gravity involves | a. mass, b. space, c. time, d. all of the above | d | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016837 | einstein explained gravity with his theory of universal gravitation. | a. true, b. false | b | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016838 | einstein developed his theory about gravity by using | a. evidence, b. observations, c. mathematics, d. scientific laws | c | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016840 | einsteins concept of gravity is similar to what happens when you place a bowling ball on the surface of a trampoline. in this analogy, if the bowling ball represents earth, then the surface of the trampoline represents | a. space-time, b. earths gravity, c. earths mass, d. none of the above | a | Lesson: einsteins concept of gravity
It Started with Newton:
In the late 1600s, Isaac Newton introduced his law of gravity, which identifies gravity as a force of attraction between all objects with mass in the universe. The law also states that the strength of gravity between two objects depends on their mass and dis... |
NDQ_016844 | the less an elastic material is stretched or compressed, the greater the force it exerts. | a. true, b. false | b | Lesson: elastic force
Elasticity and Elastic Force:
Something that is elastic can return to its original shape after being stretched or compressed. This property is called elasticity. As you stretch or compress an elastic material like a bungee cord, it resists the change in shape. It exerts a counter force in the opp... |
NDQ_016845 | elastic force causes an elastic material to spring back to its original shape after being stretched or compressed. | a. true, b. false | a | Lesson: elastic force
Elasticity and Elastic Force:
Something that is elastic can return to its original shape after being stretched or compressed. This property is called elasticity. As you stretch or compress an elastic material like a bungee cord, it resists the change in shape. It exerts a counter force in the opp... |
NDQ_016849 | play objects with elasticity include | a. spring toys, b. silly putty, c. modeling clay, d. all of the above | a | Lesson: elastic force
Elasticity and Elastic Force:
Something that is elastic can return to its original shape after being stretched or compressed. This property is called elasticity. As you stretch or compress an elastic material like a bungee cord, it resists the change in shape. It exerts a counter force in the opp... |
NDQ_016851 | an elastic material offers no resistance to forces that change its shape. | a. true, b. false | b | Lesson: elastic force
Elasticity and Elastic Force:
Something that is elastic can return to its original shape after being stretched or compressed. This property is called elasticity. As you stretch or compress an elastic material like a bungee cord, it resists the change in shape. It exerts a counter force in the opp... |
NDQ_016992 | most of the electromagnetic radiation on earth comes from the sun. | a. true, b. false | a | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_016993 | electromagnetic waves with longer wavelengths have | a. higher frequencies, b. more energy, c. faster speeds, d. none of the above | d | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_016995 | electromagnetic waves with the longest wavelengths are | a. gamma rays, b. x rays, c. infrared light, d. radio waves | d | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_016996 | electromagnetic waves with the greatest amount of energy are | a. microwaves, b. ultraviolet light, c. infrared light, d. gamma rays | d | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_016997 | the frequencies of electromagnetic waves range from | a. 104 to 1020 waves/second, b. 108 to 1016 waves/second, c. 1010 to 1014 waves/second, d. none of the above | a | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_016998 | the only electromagnetic waves in sunlight are ultraviolet, infrared, and visible light. | a. true, b. false | b | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_017000 | ultraviolet light has more energy than visible light. | a. true, b. false | a | Lesson: electromagnetic spectrum
Electromagnetic Radiation:
Electromagnetic radiation is energy that travels in waves across space as well as through matter. Most of the electromagnetic radiation on Earth comes from the sun. Like other waves, electromagnetic waves are characterized by certain wavelengths and wave freq... |
NDQ_017002 | electromagnetic waves need a medium in order to transfer energy. | a. true, b. false | b | Lesson: electromagnetic waves
What Are Electromagnetic Waves:
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electro- magnetic waves transfer energy from one place to another. The transfer of energy by electromagnetic waves is called electromagnetic radiation.... |
NDQ_017004 | electromagnetic waves | a. create force fields, b. exert force over a distance, c. can travel through outer space, d. all of the above | d | Lesson: electromagnetic waves
What Are Electromagnetic Waves:
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electro- magnetic waves transfer energy from one place to another. The transfer of energy by electromagnetic waves is called electromagnetic radiation.... |
NDQ_017006 | electromagnetic waves are | a. surface waves, b. transverse waves, c. longitudinal waves, d. none of the above | b | Lesson: electromagnetic waves
What Are Electromagnetic Waves:
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electro- magnetic waves transfer energy from one place to another. The transfer of energy by electromagnetic waves is called electromagnetic radiation.... |
NDQ_017008 | when electromagnetic waves strike matter they may be | a. absorbed, b. reflected, c. refracted, d. any of the above | d | Lesson: electromagnetic waves
What Are Electromagnetic Waves:
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electro- magnetic waves transfer energy from one place to another. The transfer of energy by electromagnetic waves is called electromagnetic radiation.... |
NDQ_017009 | electromagnetic waves may be converted to other forms of energy. | a. true, b. false | a | Lesson: electromagnetic waves
What Are Electromagnetic Waves:
Electromagnetic waves are waves that consist of vibrating electric and magnetic fields. Like other waves, electro- magnetic waves transfer energy from one place to another. The transfer of energy by electromagnetic waves is called electromagnetic radiation.... |
NDQ_017023 | orbitals may be shaped like | a. spheres, b. dumbbells, c. rings, d. all of the above | d | Lesson: electron cloud atomic model
Where Are the Electrons:
Up until about 1920, scientists accepted Niels Bohrs model of the atom. In this model, negative electrons circle the positive nucleus at fixed distances from the nucleus, called energy levels. You can see the model in Figure 1.1 for an atom of the element ni... |
NDQ_017024 | the atomic nucleus is always at the center of an orbital. | a. true, b. false | a | Lesson: electron cloud atomic model
Where Are the Electrons:
Up until about 1920, scientists accepted Niels Bohrs model of the atom. In this model, negative electrons circle the positive nucleus at fixed distances from the nucleus, called energy levels. You can see the model in Figure 1.1 for an atom of the element ni... |
NDQ_017026 | schroedinger thought that electrons | a. are restricted to very specific orbits, b. might travel in waves like light, c. have very precise locations, d. behave like protons and neutrons | b | Lesson: electron cloud atomic model
Where Are the Electrons:
Up until about 1920, scientists accepted Niels Bohrs model of the atom. In this model, negative electrons circle the positive nucleus at fixed distances from the nucleus, called energy levels. You can see the model in Figure 1.1 for an atom of the element ni... |
NDQ_017027 | bohrs atomic model explains all of the behaviors of electrons in atoms of all elements. | a. true, b. false | b | Lesson: electron cloud atomic model
Where Are the Electrons:
Up until about 1920, scientists accepted Niels Bohrs model of the atom. In this model, negative electrons circle the positive nucleus at fixed distances from the nucleus, called energy levels. You can see the model in Figure 1.1 for an atom of the element ni... |
NDQ_017030 | the electron cloud model of the atom is no longer accepted by most scientists. | a. true, b. false | b | Lesson: electron cloud atomic model
Where Are the Electrons:
Up until about 1920, scientists accepted Niels Bohrs model of the atom. In this model, negative electrons circle the positive nucleus at fixed distances from the nucleus, called energy levels. You can see the model in Figure 1.1 for an atom of the element ni... |
NDQ_017062 | like protons and neutrons, electrons consist of smaller particles. | a. true, b. false | b | Lesson: electrons
What Are Electrons:
Electrons are one of three main types of particles that make up atoms. The other two types are protons and neutrons. Unlike protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles. They are a t... |
NDQ_017063 | an electron has an electrical charge of | a. +1, b. -1, c. 0, d. 0 or -1 | b | Lesson: electrons
What Are Electrons:
Electrons are one of three main types of particles that make up atoms. The other two types are protons and neutrons. Unlike protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles. They are a t... |
NDQ_017064 | an electron has about the same mass as a proton. | a. true, b. false | b | Lesson: electrons
What Are Electrons:
Electrons are one of three main types of particles that make up atoms. The other two types are protons and neutrons. Unlike protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles. They are a t... |
NDQ_017065 | atoms always have the same number of electrons as protons. | a. true, b. false | a | Lesson: electrons
What Are Electrons:
Electrons are one of three main types of particles that make up atoms. The other two types are protons and neutrons. Unlike protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles. They are a t... |
NDQ_017070 | what is the maximum number of electrons each orbital can hold? | a. 1, b. 2, c. 4, d. 8 | b | Lesson: electrons
What Are Electrons:
Electrons are one of three main types of particles that make up atoms. The other two types are protons and neutrons. Unlike protons and neutrons, which consist of smaller, simpler particles, electrons are fundamental particles that do not consist of smaller particles. They are a t... |
NDQ_017074 | no two elements are exactly alike. | a. true, b. false | a | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017075 | which of the following substances is not an element? | a. oxygen, b. water, c. nitrogen, d. hydrogen | b | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017076 | which element is attracted by a magnet? | a. silver, b. aluminum, c. lead, d. iron | d | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017077 | which element glows red when electricity flows through it? | a. iron, b. mercury, c. neon, d. copper | c | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017078 | carbon is the most common element in living things. | a. true, b. false | a | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017079 | aristotle correctly identified four of the elements. | a. true, b. false | b | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017080 | the smallest particle of an element is a(n) | a. molecule, b. crystal, c. compound, d. atom | d | Lesson: elements
Pure Substances:
A pure substance is called an element. An element is a pure substance because it cannot be separated into any other substances. Currently, 92 different elements are known to exist in nature, although additional elements have been formed in labs. All matter consists of one or more of t... |
NDQ_017081 | only endothermic chemical reactions involve energy. | a. true, b. false | b | Lesson: endothermic reactions
What Is An Endothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products ... |
NDQ_017083 | in an endothermic reaction, it takes less energy to break bonds in the reactants than is released when new bonds form in the products. | a. true, b. false | b | Lesson: endothermic reactions
What Is An Endothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products ... |
NDQ_017085 | a constant input of energy is needed to keep an endothermic reaction going. | a. true, b. false | a | Lesson: endothermic reactions
What Is An Endothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products ... |
NDQ_017087 | which statement about the chemical reactions of photosynthesis is true? | a. they are endothermic, b. they produce energy in the form of light, c. they can be represented by 6co2 + 6h2o c6h12o6 + 6o2, d. two of the above | d | Lesson: endothermic reactions
What Is An Endothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products ... |
NDQ_017088 | during an endothermic reaction, energy is | a. absorbed, b. released, c. destroyed, d. created | a | Lesson: endothermic reactions
What Is An Endothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called exothermic reactions, more energy is released when new bonds form in the products ... |
NDQ_017094 | when work is done, energy is transferred from one object to another. | a. true, b. false | a | Lesson: energy
Defining Energy:
Energy is defined in science as the ability to move matter or change matter in some other way. Energy can also be defined as the ability to do work, which means using force to move an object over a distance. When work is done, energy is transferred from one object to another. For exampl... |
NDQ_017095 | the si unit for energy is the newton. | a. true, b. false | b | Lesson: energy
Defining Energy:
Energy is defined in science as the ability to move matter or change matter in some other way. Energy can also be defined as the ability to do work, which means using force to move an object over a distance. When work is done, energy is transferred from one object to another. For exampl... |
NDQ_017096 | forms of energy include | a. chemical energy, b. mechanical energy, c. thermal energy, d. all of the above | d | Lesson: energy
Defining Energy:
Energy is defined in science as the ability to move matter or change matter in some other way. Energy can also be defined as the ability to do work, which means using force to move an object over a distance. When work is done, energy is transferred from one object to another. For exampl... |
NDQ_017097 | anything that is moving has kinetic energy. | a. true, b. false | a | Lesson: energy
Defining Energy:
Energy is defined in science as the ability to move matter or change matter in some other way. Energy can also be defined as the ability to do work, which means using force to move an object over a distance. When work is done, energy is transferred from one object to another. For exampl... |
NDQ_017099 | when you run around a track, which type of energy are you demonstrating? | a. mechanical energy, b. potential energy, c. kinetic energy, d. two of the above | d | Lesson: energy
Defining Energy:
Energy is defined in science as the ability to move matter or change matter in some other way. Energy can also be defined as the ability to do work, which means using force to move an object over a distance. When work is done, energy is transferred from one object to another. For exampl... |
NDQ_017101 | energy conversion means saving energy. | a. true, b. false | b | Lesson: energy conversion
Defining Gravity:
Gravity is a force, but not like other forces you may know. Gravity is a bit special. You know that a force is a push or pull. If you push a ball, it starts to roll. If you lift a book, it moves upward. Now, imagine you drop a ball. It falls to the ground. Can you see the fo... |
NDQ_017105 | most electricity comes from the burning of | a. fossil fuels, b. trash, c. wood, d. none of the above | a | Lesson: energy conversion
Defining Gravity:
Gravity is a force, but not like other forces you may know. Gravity is a bit special. You know that a force is a push or pull. If you push a ball, it starts to roll. If you lift a book, it moves upward. Now, imagine you drop a ball. It falls to the ground. Can you see the fo... |
NDQ_017106 | any form of energy can change into any other form of energy. | a. true, b. false | a | Lesson: energy conversion
Defining Gravity:
Gravity is a force, but not like other forces you may know. Gravity is a bit special. You know that a force is a push or pull. If you push a ball, it starts to roll. If you lift a book, it moves upward. Now, imagine you drop a ball. It falls to the ground. Can you see the fo... |
NDQ_017107 | one form of energy can change into two or more other forms of energy. | a. true, b. false | a | Lesson: energy conversion
Defining Gravity:
Gravity is a force, but not like other forces you may know. Gravity is a bit special. You know that a force is a push or pull. If you push a ball, it starts to roll. If you lift a book, it moves upward. Now, imagine you drop a ball. It falls to the ground. Can you see the fo... |
NDQ_017109 | examples of the energy conversion described in question 8 include | a. using a playground slide, b. going up and down stairs, c. bouncing on a trampoline, d. all of the above | d | Lesson: energy conversion
Defining Gravity:
Gravity is a force, but not like other forces you may know. Gravity is a bit special. You know that a force is a push or pull. If you push a ball, it starts to roll. If you lift a book, it moves upward. Now, imagine you drop a ball. It falls to the ground. Can you see the fo... |
NDQ_017112 | electrons can occupy the spaces between energy levels. | a. true, b. false | b | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017113 | electrons in the first energy level have the least amount of energy. | a. true, b. false | a | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017115 | if an atom has just three electrons, they will be located in energy level(s) | a. i and ii, b. i, ii, and iii, c. i only, d. i or ii | a | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017117 | how many electrons can each orbital hold? | a. 1, b. 2, c. 3, d. 4 | b | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017119 | any atom is most stable when its outermost energy level contains | a. a maximum of two electrons, b. a total of eight electrons, c. as many electrons as it can hold, d. fewer electrons than it can hold | c | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017120 | valence electrons determine how reactive an element is. | a. true, b. false | a | Lesson: energy level
What Are Energy Levels:
Energy levels (also called electron shells) are fixed distances from the nucleus of an atom where electrons may be found. Electrons are tiny, negatively charged particles in an atom that move around the positive nucleus at the center. Energy levels are a little like the ste... |
NDQ_017123 | enzymes work by providing activation energy. | a. true, b. false | b | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017124 | enzymes are used up in the reactions they catalyze. | a. true, b. false | b | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017126 | a human enzyme that helps digest starch is | a. pepsase, b. starchase, c. amylase, d. glucase | c | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017127 | which of the following statements about enzymes if false? | a. enzymes are highly specialized for the reactions they catalyze, b. enzymes are very effective at speeding up reactions, c. enzymes are very efficient at catalyzing reactions, d. enzymes usually result in the formation of waste products | d | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017129 | about 100 different enzymes are needed for human life. | a. true, b. false | b | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017130 | enzymes are | a. proteins, b. encoded in dna, c. made in the cells where they are needed, d. all of the above | d | Lesson: enzymes as catalysts
Why Living Things Need Enzymes:
Chemical reactions constantly occur inside the cells of living things. However, under the conditions inside cells, most biochemical reactions would occur too slowly to maintain life. Thats where enzymes come in. Enzymes are catalysts in living things. Like o... |
NDQ_017153 | in an exothermic reaction, the reactants have more stored chemical energy than the products. | a. true, b. false | a | Lesson: exothermic reactions
What Is An Exothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called endothermic reactions, less energy is released when new bonds form in the products t... |
NDQ_017154 | in an exothermic reaction, it takes more energy to break bonds in the reactants than is released when new bonds form in the products. | a. true, b. false | b | Lesson: exothermic reactions
What Is An Exothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called endothermic reactions, less energy is released when new bonds form in the products t... |
NDQ_017156 | all combustion reactions are exothermic reactions. | a. true, b. false | a | Lesson: exothermic reactions
What Is An Exothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called endothermic reactions, less energy is released when new bonds form in the products t... |
NDQ_017158 | which of the following reactions is exothermic? | a. ch4 + f2 ch3f + hf, b. ch4 + 2o2 co2 + 2h2o, c. 2h2o 2h2 + o2, d. two of the above | d | Lesson: exothermic reactions
What Is An Exothermic Reaction:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. In some chemical reactions, called endothermic reactions, less energy is released when new bonds form in the products t... |
NDQ_017163 | a steam engine is an external combustion engine. | a. true, b. false | a | Lesson: external combustion engines
What Is a Combustion Engine:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the thermal energy to do work. There are two types of combustion engines: external and internal. A steam engine is an external combustion engine.
How Exter... |
NDQ_017165 | an external combustion engine | a. burns fuel outside the engine, b. changes kinetic energy to thermal energy, c. runs on electricity, d. all of the above | a | Lesson: external combustion engines
What Is a Combustion Engine:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the thermal energy to do work. There are two types of combustion engines: external and internal. A steam engine is an external combustion engine.
How Exter... |
NDQ_017167 | the kinetic energy of an external combustion engine can be used to | a. turn the wheels of a vehicle, b. turn a turbine, c. run other machines, d. all of the above | d | Lesson: external combustion engines
What Is a Combustion Engine:
A combustion engine is a complex machine that burns fuel to produce thermal energy and then uses the thermal energy to do work. There are two types of combustion engines: external and internal. A steam engine is an external combustion engine.
How Exter... |
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