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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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| 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 salt. |
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| A value that is used to express the acidity or basicity (alkalinity) of a system. |
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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 oils, 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 precesses. |
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| A 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 shich velocity change3s over time; an object accelerates if its speed direction or both change. |
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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 mearure of the amount of matter in an object. |
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| The constant velocity of a falling 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 the 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 process by which one or more substances change to produce one or more different substances. |
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| A solid that is produces as a result of a chemical reaction in a solution. |
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| A chemical reaction that requires heat. |
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| Law of Conservation of Energy |
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| The law that states that energy can not be created or destroyed but can be changed from one form to another. |
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| A combination of chemical symbols and numbers to represent a substance. |
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| A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products. |
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| A substance or molecule that participates in a chemical reaction. |
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| A substance that forms in a chemical reaction. |
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| Law of conservation of mass |
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| The law that states that mass cannot be created or destroyed in ordinary chemical reactions. |
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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 as viewed from different locations. |
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| The location on the H-R diagram where most stars lie; it has a diagonal pattern form the lower rignht (low temperature and luminosity) to the upper left (high temperature and luminosity.) |
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| Hertzsprung-Russel diagram, a graph that shows the relationship between a star's surface temperature nad the 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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| A rotating cloud of gas and dust from which the sun and planets formed. |
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| The average distanvce between Earth and the sun; approximately 150 million kilometers |
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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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| A notural or artificial body that revolves around a planet. |
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| The change in the sunlit area of one celestial bosy as seen from another celestial body. |
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| An event in which the shadow of one celestial body falls on another. |
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| A small body of ice, rock and cosmic dust that follows an eliptical orbit around the sun and that gives off gas and dust in the form of a tail as it passes close to the sun. |
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| A small, rocky object that orbits the sun; most asteroids are located in a band between the orbits of Mars and Jupiter. |
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| A relatively small, rocky body that travels throughout space. |
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| A brigtht streak of light that results when a meteoroid burns up in Earth's atmosphere. |
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| A meteoroid that reaches Earth's surface without burning up completely. |
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