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008Chemical Reaction
Chemical Reactions/Formulas/Law of Conservation of Mass
Term | Definition |
---|---|
Chemical change | the formation of a new substance with different properties; cannot be undone by physical means |
Chemical equation | a representation of a chemical reaction by symbols and numbers |
Chemical formula | a representation of a molecule or compound in which the elements are represented by their symbols and subscripts represent the number of atoms of each element |
Chemical reaction | a change caused by the interaction of two or more substances (reactants) resulting in the formation of new substances (products) |
Coefficient | the number placed in front of a chemical formula in a chemical equation; represents the number of molecules of that substance |
Compound | a substance made of two or more elements |
Law of conservation of mass | matter is not created or destroyed; only rearranged |
Molecule | combined atoms of the same element (e.g., O2) |
Precipitate | the formation of solids from a solution |
Product | substance(s) resulting from a chemical reaction |
Reactant | substances that are combined and changed during a chemical reaction |
Subscript | the number written to the right and slightly below an element in a chemical formula; represents the number of atoms of an element present in a chemical formula |