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| an interaction that holds atoms or ions together |
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| a compound made of oppositely charged ions |
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| a chemical compound that is formed by the sharing of electrons |
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| any compond that increases the number of hydronium ions when dissolved in water |
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| a compound that can reversibly change color depending on conditions such as pH |
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| any compound that increases the number of hydroxide ions when dissolved in water |
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| the reaction of an acid and a base to form a neutral solution of water and a salt |
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| a value that is usedto express the acidity or basicity |
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| an ionic compound that forms when a metal atom replaces the hydrogen of an acid |
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| a covalently bonded compound that contains carbon |
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| a class of energy giving nutrients that includes sugars starches and fiber contains carbon hydrogen and oxygen |
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| a fat molecule or a molecule that has similar properties examples include olis, waxes, and steroids |
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| a molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes |
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| molecule made up of subunits called nucleotides |
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| an object's change in position relative to a reference point |
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| the total distance traveled divided by the total time taken |
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| the speed of an object in a particular direction |
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| the rate at which velocity changes over time an object accelerates if its speed, direction or both change |
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| a push or pull exerted on an object in order to change the motion of the object; force has size and direction |
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| the combination of all of the forces action on an object |
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| a force that opposes motion between two surfaces that are in contact |
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| a force of attraction between objects that is due to their masses |
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| a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe |
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| a measure of the amount of matter in an object |
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| the constant velocity of a fallling object when the force of air resistance is equal in magnitude and opposite in direction to the force of gravity |
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| the motion of a body when only the force of gravity is acting on the body |
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| the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth |
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| the tendency of an object to resist being moved or, if the object is moving to resist a change in speed or direction until an outside force acts on the object |
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| the band of colors produced when white light passes through a prism |
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| the brightness of a star as seen from Earth |
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| the brightness that a star would have at a distance of 32.6 light-years from Earth |
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| the distance that light travels in one year; about 9.46 trillion kilometers |
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| an apparent shift in the position of an object when viewed from different locations |
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| the location on the H-R diagram where most stars lie; it has a diagonal pattern from the lower right to the upper left |
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| Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude |
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| a gigantic explosion in which a massive star collapses and throws its outer layers into space |
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| a collection of stars, dust, and gas bound together by gravity |
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| a large cloud of gas and dust in interstellar space; a region in space where stars are born |
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| the theory that all matter and energy in the universe was compressed into an extremely small volume that 13 billion to 15billion years ago expladed and began expanding in all directions |
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| one of the highly dense planets nearest to the sun; Mercury, Venus< Mars and Earth |
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| the counterclockwise spin of a planet or moon as seen from above the planet's North Pole; rotation in the same direction as the sun's rotation |
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| the clockwise spin of a planet or moon as seen from above the planet's North Pole |
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| a planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus or Neptune |
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