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Changes in Matter
Term | Definition |
---|---|
element | a pure substance that cannot be broken down into other substances by chemical or physical means |
atom | the basic particle from which all elements are made |
molecule | a group of two or more atoms held together by chemical bonds |
compound | a substance made of two or more elements chemically combined in a specific ratio |
physical change | a change that alters the form or appearance of matter but does not turn any substance in the matter to a different substance |
chemical change | a change in matter that produces one or more new substances |
thermal energy | the total kinetic and potential energy of all the particles of an object |
exothermic change | a change in which energy is released |
endothermic change | a change in which energy is absorbed |