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Phys Sci - Chap 7
vocabulary words
Question | Answer |
---|---|
reactants | substances that undergo change in a chemical reaction |
products | new substances formed as a result of chemical reaction |
chemical equation | a representation of a chemical reaction in which the reactants and products are expressed as formulas |
coefficients | numbers that appear before a formula in a chemical equation to show the relative proportions of each reactant and product |
mole | an amount of a substance that contains approximately 6.02 x 10^23 particles of the substance |
molar mass | the mass of one mole of a substance |
synthesis reaction | a chemical reaction in which 2 or more substance react to form a single substance |
decomposition reaction | a chemical reaction in which a compound breaks down into 2 or more simpler substances |
single-replacement reaction | a chemical reaction in which one element take the place of another element in a compound |
double-replacement action | a chemical reaction in which 2 compounds exchange positive ions and form 2 new compounds |
combustion reaction | a chemical reaction in which a substance reacts rapidly with oxygen, often producing light and heat |
oxidation-reduction reaction | a chemical reaction in which electrons are transferred from one reactant to another |
chemical energy | the energy stored in chemical bonds |
exothermic reaction | a chemical reaction that releases energy to its surroundings |
endothermic reation | a chemical reaction that absorbs energy from its surroundings |
reaction rate | the rate at which reactants change into products over time |
catalyst | a substance that affects the rate of a chemical reaction without being used up in the reaction |
equilibrium | a state in which the forward and reverse paths of a physical or chemical change take place at the same rate |
reversible reaction | a chemical reaction in which the conversion of reactants into products and the conversion of products into reactants happens at the same time |