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8.5E
Chemical Reactions
Question | Answer |
---|---|
Evidence | indication that an event has occurred |
Substance | an element or compound that can only be separated or combined to make substances with new properties by means of a chemical reaction |
Chemical Reaction | the process by which one or more substances change to produce one or more different substances |
Precipitate | a solid that is deposited from a solution |
Endothermic | a process that absorbs heat |
Exothermic | a process that release heat |
Chemical Equation | chemical formulas and symbols written to represent a reaction |
Reactants | a substance that takes part in and undergoes change during a reaction |
Products | substances produced during chemical reactions |
Coefficient | a number placed in front of a chemical symbol or formula in order to balance the equation |
Balanced Chemical Equation | a symbolic representation of a chemical reaction in which both sides of the equation contain equivalent numbers of atoms of each element |
Law of Conservation of Mass | the mass of all reactants must equal the mass of all products; matter us neither created nor destroyed |