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14,600 | NDQ_017397 | hydrogen bonding | in water, hydrogen bonds hold together | null | null | Multiple Choice | a. hydrogen and oxygen atoms in the same molecule., b. hydrogen and oxygen atoms in different molecules., c. hydrogen atoms in different molecules., d. hydrogen atoms in the same molecule. | b |
14,601 | NDQ_017398 | hydrogen bonding | polar molecules tend to have lower boiling points than nonpolar molecules. | null | null | Multiple Choice | a. true, b. false | b |
14,602 | NDQ_017399 | hydrogen bonding | which of the following compounds has the highest melting point? | null | null | Multiple Choice | a. methane, b. ethylene, c. ammonia, d. water | d |
14,603 | NDQ_017412 | inclined plane | an inclined plane is one of six types of simple machines. | null | null | Multiple Choice | a. true, b. false | a |
14,604 | NDQ_017413 | inclined plane | simple machines that are variations of the inclined plane include the | null | null | Multiple Choice | a. screw., b. lever., c. wedge., d. two of the above | d |
14,605 | NDQ_017414 | inclined plane | examples of inclined planes include | null | null | Multiple Choice | a. ramps., b. playground slides., c. ladders., d. all of the above | d |
14,606 | NDQ_017418 | inclined plane | mechanical advantage is the ratio of input force to output force. | null | null | Multiple Choice | a. true, b. false | b |
14,607 | NDQ_017419 | inclined plane | the mechanical advantage of an inclined plane is always | null | null | Multiple Choice | a. less than 1., b. equal to 1., c. greater than 1., d. equal to zero. | c |
14,608 | NDQ_017420 | inclined plane | the more gradual the slope of an inclined plane, the greater its mechanical advantage is. | null | null | Multiple Choice | a. true, b. false | a |
14,609 | NDQ_017422 | inertia | only moving objects have inertia. | null | null | Multiple Choice | a. true, b. false | b |
14,610 | NDQ_017423 | inertia | newtons first law of motion is also called the law of inertia. | null | null | Multiple Choice | a. true, b. false | a |
14,611 | NDQ_017425 | inertia | which object has the greatest inertia? | null | null | Multiple Choice | a. 5-kg rock, b. 6-kg box of feathers, c. 7-kg bag of groceries, d. 8-kg bowling ball | d |
14,612 | NDQ_017427 | inertia | once an object starts moving, inertia keeps it moving without any additional force being applied to the object. | null | null | Multiple Choice | a. true, b. false | a |
14,613 | NDQ_017433 | intensity and loudness of sound | intensity is a measure of a sound waves | null | null | Multiple Choice | a. speed., b. frequency., c. wavelength., d. energy. | d |
14,614 | NDQ_017435 | intensity and loudness of sound | an 80-decibel sound is 20 times louder than a 60-decibel sound. | null | null | Multiple Choice | a. true, b. false | b |
14,615 | NDQ_017437 | intensity and loudness of sound | the intensity of sound depends on the | null | null | Multiple Choice | a. amplitude of the sound waves produced by the sound source., b. distance the sound waves have traveled from the sound source., c. speed at which the sound waves traveled from the sound source., d. two of the above | d |
14,616 | NDQ_017438 | intensity and loudness of sound | as distance from the sound source increases, the area covered by the sound waves decreases. | null | null | Multiple Choice | a. true, b. false | b |
14,617 | NDQ_017439 | intensity and loudness of sound | amplitude is a measure of the size of sound waves. | null | null | Multiple Choice | a. true, b. false | a |
14,618 | NDQ_017440 | intensity and loudness of sound | which sound is considered to be extremely loud? | null | null | Multiple Choice | a. dishwasher, b. lawn mower, c. vacuum cleaner, d. two of the above | b |
14,619 | NDQ_017442 | internal combustion engines | all combustion engines | null | null | Multiple Choice | a. burn fuel to produce thermal energy., b. change thermal energy to kinetic energy., c. burn fuel inside the engine., d. two of the above | d |
14,620 | NDQ_017443 | internal combustion engines | in an internal combustion engine, fuel is burned in the | null | null | Multiple Choice | a. cylinders., b. valves., c. spark plugs., d. pistons. | a |
14,621 | NDQ_017446 | internal combustion engines | a car engine provides the kinetic energy needed to | null | null | Multiple Choice | a. turn the wheels., b. apply the brakes., c. power the lights., d. two of the above | a |
14,622 | NDQ_017449 | internal combustion engines | all cars have at least eight cylinders. | null | null | Multiple Choice | a. true, b. false | b |
14,623 | NDQ_017450 | internal combustion engines | the more pistons a car has, the greater the cars power is. | null | null | Multiple Choice | a. true, b. false | a |
14,624 | NDQ_017455 | international system of units | what is the basic unit of mass in the international system of units? | null | null | Multiple Choice | a. ounce, b. pound, c. gram, d. kilogram | c |
14,625 | NDQ_017456 | international system of units | the prefix that multiplies a basic si unit by 0.01 is | null | null | Multiple Choice | a. kilo-, b. deci-, c. centi-, d. milli- | c |
14,626 | NDQ_017459 | international system of units | a kilogram equals one-thousandth of a gram. | null | null | Multiple Choice | a. true, b. false | b |
14,627 | NDQ_017463 | ionic bonding | how do ionic bonds form? | null | null | Multiple Choice | a. Atoms of metallic elements give up electrons to atoms of nonmetallic elements., b. Atoms of nonmetallic elements give up electrons to atoms of metallic elements., c. Atoms of metallic elements accept electrons from atoms of nonmetallic elements., d. two of the above | a |
14,628 | NDQ_017464 | ionic bonding | in an ionic bond, the metallic ion is always a positive ion. | null | null | Multiple Choice | a. true, b. false | a |
14,629 | NDQ_017465 | ionic bonding | positive ions are named by adding the suffix ide to the first part of the element name. | null | null | Multiple Choice | a. true, b. false | b |
14,630 | NDQ_017467 | ionic bonding | ionic bonds form only between metals and nonmetals. | null | null | Multiple Choice | a. true, b. false | a |
14,631 | NDQ_017468 | ionic bonding | atoms of the element sodium want to give up an electron because sodium atoms | null | null | Multiple Choice | a. already have seven valence electrons., b. do not need any electrons., c. have just one valence electron., d. form negative metal ions. | c |
14,632 | NDQ_017469 | ionic bonding | metals in group 2 of the periodic table form ionic bonds with nonmetals in group | null | null | Multiple Choice | a. 15., b. 16., c. 17., d. 18. | b |
14,633 | NDQ_017473 | ionic compounds | ionic compounds form when ions of two different elements share electrons. | null | null | Multiple Choice | a. true, b. false | b |
14,634 | NDQ_017474 | ionic compounds | an ionic compound is always neutral in charge. | null | null | Multiple Choice | a. true, b. false | a |
14,635 | NDQ_017476 | ionic compounds | how are ionic compounds named? | null | null | Multiple Choice | a. The positive ion comes first in the compound name., b. The negative ion comes first in the compound name., c. The ion in the higher-numbered period comes first in the compound name., d. two of the above | a |
14,636 | NDQ_017478 | ionic compounds | properties of ionic compounds include | null | null | Multiple Choice | a. high melting point., b. ability to conduct electricity., c. brittleness., d. two of the above | d |
14,637 | NDQ_017480 | ionic compounds | uses of ionic compounds include | null | null | Multiple Choice | a. making fireworks., b. detecting moisture., c. melting ice., d. all of the above | d |
14,638 | NDQ_017484 | ions | an iodine atom has 53 protons. how many electrons does an iodine anion have? | null | null | Multiple Choice | a. at least 54, b. 53 or more, c. 53 or less, d. none of the above | a |
14,639 | NDQ_017485 | ions | what is the name of the ion represented by the following symbol? o2- | null | null | Multiple Choice | a. oxygen ion, b. dioxide, c. oxide, d. none of the above | c |
14,640 | NDQ_017486 | ions | the process in which ions form is called ionization. | null | null | Multiple Choice | a. true, b. false | a |
14,641 | NDQ_017487 | ions | ways in which ions may form include | null | null | Multiple Choice | a. exposure to radiation., b. transfer of electrons between atoms., c. sharing of electrons between atoms., d. two of the above | d |
14,642 | NDQ_017488 | ions | ions are very unreactive. | null | null | Multiple Choice | a. true, b. false | b |
14,643 | NDQ_017489 | ions | ions are deflected by a magnetic field. | null | null | Multiple Choice | a. true, b. false | a |
14,644 | NDQ_017492 | isomers | only unsaturated hydrocarbons have isomers. | null | null | Multiple Choice | a. true, b. false | b |
14,645 | NDQ_017493 | isomers | which statement about the isomers of a given hydrocarbon is true? | null | null | Multiple Choice | a. They have the same chemical formula., b. They have the same structural formula., c. They have the same number of carbon atoms., d. two of the above | d |
14,646 | NDQ_017496 | isomers | how many isomers does pentane have? | null | null | Multiple Choice | a. 1, b. 2, c. 3, d. 4 | c |
14,647 | NDQ_017497 | isomers | some hydrocarbons have billions of isomers. | null | null | Multiple Choice | a. true, b. false | a |
14,648 | NDQ_017500 | isomers | the more branching an isomer has, the lower its melting point is. | null | null | Multiple Choice | a. true, b. false | a |
14,649 | NDQ_017502 | isotopes | all isotopes form naturally. | null | null | Multiple Choice | a. true, b. false | b |
14,650 | NDQ_017503 | isotopes | all isotopes are radioactive. | null | null | Multiple Choice | a. true, b. false | b |
14,651 | NDQ_017506 | isotopes | deuterium is an isotope of | null | null | Multiple Choice | a. oxygen., b. helium., c. carbon., d. hydrogen. | d |
14,652 | NDQ_017507 | isotopes | how many neutrons does the isotope in question 6 have? | null | null | Multiple Choice | a. one, b. two, c. three, d. four | a |
14,653 | NDQ_017512 | kinetic energy | things with kinetic energy can do work. | null | null | Multiple Choice | a. true, b. false | a |
14,654 | NDQ_017516 | kinetic energy | an objects mass has a greater influence on its kinetic energy than does its velocity. | null | null | Multiple Choice | a. true, b. false | b |
14,655 | NDQ_017517 | kinetic energy | how much kinetic energy does a 50-kg object have if it is moving at a velocity of 2 m/s? | null | null | Multiple Choice | a. 200 J, b. 100 J, c. 50 J, d. none of the above | b |
14,656 | NDQ_017518 | kinetic energy | if the object in question 6 slows down to a velocity of 1 m/s, how much kinetic energy does it have? | null | null | Multiple Choice | a. 100 J, b. 50 J, c. 25 J, d. none of the above | c |
14,657 | NDQ_017520 | kinetic energy | energy can be measured in the si unit n m. | null | null | Multiple Choice | a. true, b. false | a |
14,658 | NDQ_017524 | kinetic theory of matter | if particles of matter do not have enough kinetic energy to slide past one another, then the matter exists as a | null | null | Multiple Choice | a. gas., b. solid., c. liquid., d. plasma. | b |
14,659 | NDQ_017525 | kinetic theory of matter | the particles of solids do not have enough energy to move. | null | null | Multiple Choice | a. true, b. false | b |
14,660 | NDQ_017526 | kinetic theory of matter | as the kinetic energy of particles of matter increases, the distance between the particles | null | null | Multiple Choice | a. vibrates., b. increases., c. decreases., d. remains constant. | b |
14,661 | NDQ_017528 | kinetic theory of matter | scientists think that the particles of all matter are in constant motion. | null | null | Multiple Choice | a. true, b. false | a |
14,662 | NDQ_017530 | kinetic theory of matter | particles of liquids have enough energy to separate from other liquid particles. | null | null | Multiple Choice | a. true, b. false | b |
14,663 | NDQ_017533 | law of conservation of momentum | whenever an action and reaction occur, momentum is | null | null | Multiple Choice | a. created., b. destroyed., c. transferred., d. none of the above | c |
14,664 | NDQ_017534 | law of conservation of momentum | when momentum is transferred from one object to another, their combined momentum remains the same. | null | null | Multiple Choice | a. true, b. false | a |
14,665 | NDQ_017543 | law of reflection | when light reflects off a smooth surface, it forms a clear image. | null | null | Multiple Choice | a. true, b. false | a |
14,666 | NDQ_017544 | law of reflection | the type of reflection described in question 3 is called | null | null | Multiple Choice | a. normal reflection., b. diffuse reflection., c. regular reflection., d. none of the above | c |
14,667 | NDQ_017545 | law of reflection | rays of light are reflected in many different directions in | null | null | Multiple Choice | a. specular reflection., b. regular reflection., c. diffuse reflection., d. all of the above | c |
14,668 | NDQ_017546 | law of reflection | the image formed when light rays are reflected as described in question 5 is blurry or fuzzy. | null | null | Multiple Choice | a. true, b. false | a |
14,669 | NDQ_017550 | law of reflection | the angles of reflection and incidence are measured relative to a line that is parallel to the reflective surface. | null | null | Multiple Choice | a. true, b. false | b |
14,670 | NDQ_017552 | lens | a lens reflects light and forms an image. | null | null | Multiple Choice | a. true, b. false | b |
14,671 | NDQ_017553 | lens | the less curved the surface of a lens is, the more the lens refracts light. | null | null | Multiple Choice | a. true, b. false | b |
14,672 | NDQ_017556 | lens | the image of an object formed by a concave lens is always | null | null | Multiple Choice | a. on the same side of the lens as the object., b. smaller than the object., c. right-side up., d. all of the above | d |
14,673 | NDQ_017557 | lens | a concave lens forms only real images. | null | null | Multiple Choice | a. true, b. false | b |
14,674 | NDQ_017558 | lens | a convex lens forms a virtual image when the object is | null | null | Multiple Choice | a. closer to the lens than the focus is., b. farther from the lens than the focus is., c. the same distance from the lens as the focus is., d. on the opposite side of the lens from the focus. | a |
14,675 | NDQ_017564 | lever | levers that change the direction of the force are | null | null | Multiple Choice | a. first class levers., b. second class levers., c. third class levers., d. all of the above | a |
14,676 | NDQ_017567 | lever | examples of first-class levers include | null | null | Multiple Choice | a. see saws., b. wheelbarrows., c. rakes., d. two of the above | a |
14,677 | NDQ_017568 | lever | all of the following are third-class levers except | null | null | Multiple Choice | a. brooms., b. hockey sticks., c. rakes., d. wheelbarrows. | d |
14,678 | NDQ_017569 | lever | a second class lever always has an ideal mechanical advantage less than 1. | null | null | Multiple Choice | a. true, b. false | b |
14,679 | NDQ_017570 | lever | a third class lever always applies the output force over a greater distance than the input force. | null | null | Multiple Choice | a. true, b. false | a |
14,680 | NDQ_017573 | light | sunlight carries the complete range of wavelengths of electromagnetic waves. | null | null | Multiple Choice | a. true, b. false | a |
14,681 | NDQ_017574 | light | light includes | null | null | Multiple Choice | a. visible light., b. ultraviolet light., c. infrared light., d. all of the above | d |
14,682 | NDQ_017577 | light | sources of infrared light include | null | null | Multiple Choice | a. the sun., b. flames., c. living things., d. all of the above | d |
14,683 | NDQ_017578 | light | visible light with the highest frequencies appears to our eyes as the color | null | null | Multiple Choice | a. red., b. yellow., c. green., d. violet. | d |
14,684 | NDQ_017579 | light | ultraviolet light can be used to kill bacteria in food. | null | null | Multiple Choice | a. true, b. false | a |
14,685 | NDQ_017581 | lipid classification | lipids are biochemical compounds that include fats and oils. | null | null | Multiple Choice | a. true, b. false | a |
14,686 | NDQ_017585 | lipid classification | all lipids contain | null | null | Multiple Choice | a. oxygen., b. nitrogen., c. phosphorus., d. two of the above | a |
14,687 | NDQ_017587 | lipid classification | lipids known as fats consist of saturated fatty acids. | null | null | Multiple Choice | a. true, b. false | a |
14,688 | NDQ_017588 | lipid classification | unsaturated fatty acids contain only single bonds between carbon atoms. | null | null | Multiple Choice | a. true, b. false | b |
14,689 | NDQ_017603 | longitudinal wave | a longitudinal wave is a type of mechanical wave. | null | null | Multiple Choice | a. true, b. false | a |
14,690 | NDQ_017606 | longitudinal wave | in a longitudinal wave, particles of the medium vibrate in a direction that is perpendicular to the direction the wave travels. | null | null | Multiple Choice | a. true, b. false | b |
14,691 | NDQ_017608 | longitudinal wave | earthquakes cause longitudinal waves called p waves. | null | null | Multiple Choice | a. true, b. false | a |
14,692 | NDQ_017609 | longitudinal wave | a longitudinal wave that carries more energy has particles that are | null | null | Multiple Choice | a. closer together in rarefactions., b. father apart in compressions., c. the same distance apart everywhere., d. none of the above | d |
14,693 | NDQ_017611 | magnetic field reversal | earths magnetic poles have switched places repeatedly in the past. | null | null | Multiple Choice | a. true, b. false | a |
14,694 | NDQ_017615 | magnetic field reversal | scientists know for certain why magnetic field reversals occur. | null | null | Multiple Choice | a. true, b. false | b |
14,695 | NDQ_017616 | magnetic field reversal | evidence for magnetic field reversals | null | null | Multiple Choice | a. covers 100s of millions of years., b. was discovered on the ocean floor., c. comes from the magnetic domains of rocks., d. all of the above | d |
14,696 | NDQ_017617 | magnetic field reversal | when did the last magnetic reversal occur? | null | null | Multiple Choice | a. more than 330 million years ago, b. about 300 million years ago, c. about 100 million years ago, d. less than 1 million years ago | d |
14,697 | NDQ_017618 | magnetic field reversal | rocks on the ocean floor far from a ridge | null | null | Multiple Choice | a. are older than rocks close to the ridge., b. always have reversed polarity., c. keep reversing the polarity of their magnetic domains., d. two of the above | a |
14,698 | NDQ_017619 | magnetic field reversal | after magma hardens, the alignment of magnetic domains reverses with each magnetic field reversal. | null | null | Multiple Choice | a. true, b. false | b |
14,699 | NDQ_017622 | magnets | only bar magnets have north and south magnetic poles. | null | null | Multiple Choice | a. true, b. false | b |
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