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inter of matter
| Term | Definition |
|---|---|
| chemical reaction | is the proccess in which atoms are rearranged to produce new substances |
| chemical formula | use chemical symbols and numbers to represent a given substances |
| chemical equation | is an expression that uses symbols to show the relationship between starting substances and the substances that are produced by a chemical reaction |
| reactant | are the substances that participate in a chemical reaction. their chemical formulas are written on the left |
| producter | are the substances formed in a reaction. Their chemical formulas are written on the right |
| law of conservation of mass | States that matter is neither created nor destroyed in ordinary physical and created nor destroyed in ordinary physical and chemical changes |
| endothermic reaction | chemicalreaction that requires energy input usually as heat |
| exothermic reaction | a chemical reaction in which energy is relesed to the surroundings usally as heat |
| law of conservation of energey | states that energy cannot be created or destroyed |