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states of matter
Term | Definition |
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chemical reaction | the process in which atoms are rearranged and chemical bonds are broken and formed to produce a chemical change of a substance. |
chemical formula | a combination of chemical symbols and numbers to represent a substance. |
chemical equation | a representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products. |
reactant | a substance that participates in a chemical reaction. |
product | a substance that forms in a chemical reaction. |
law of conservation of mass | the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes. |
endothermic reaction | a chemical reaction that requires energy input, usually as heat. |
exothermic reaction | a chemical reaction in which energy is released to the surroundings, usually as heat. |
law of conservation of energy | the law that states energy cannot be created or destroyed but can be changed from one form to another. |
organic compound | a covalently bonded compound that contains carbon. |
hydrocarbon | an organic compound composed only of carbon hydrogen. |
organic acid | an organic chemical compound that contains one or more carboxyl groups; examples are acetic and lactic acid. |
carbohydrate | a class of molecules that includes sugar, starches,and fiber; contains carbon, hydrogen, and oxygen. |
polymer | a large molecule that is formed by more than five monomers, or small units. |