| A | B |
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| chemical equation | Represents a chemical reaction with the use of symbols. |
| chemical reaction | Process in which a new substance is formed. |
| coefficients | Numbers that appear before the chemical formular |
| combustion reaction | Substance reacts with oxygen and produces heat and light. |
| decomposition reaction | Compound breaks down into two or more simpler substances. |
| double-replacement reaction | Two compounds exchange positive ions (metals) and form two new compounds. |
| molar mass | The mass of one mole of a substance. |
| mole | Amount of substance that contains 6.02 x 10^23 atoms. |
| oxidation-reduction reaction | Electrons are transferred from one reactant to another. |
| products | The new substance formed as a result of a chemical reaction. |
| reactants | The substance that undergoes a change in a chemical reaction. |
| single-replacment reaction | One elements takes the place of another element in a compound. |
| synthesis reaction | Two or more substances react to form a single substance. |
| activation energy | Amount of energy needed to break the bonds in the reactants to form the products. |
| catalyst | A substance that affects the rate of a chemical reaction without being used up in the reaction. |
| chemical energy | The energy stored in chemical bonds. |
| concentration | The amount of substance dissolved in a certain amount of liquid. |
| endothermic reaction | A chemical reaction that absorbs energy from its surroundings. |
| exothermic reaction | A chemical reaction that releases energy to its surroundings. |
| law of conservation of mass | Mass cannot be created nor destroyed in a chemical reaction. |
| reaction rate | The rate at which a reactant changes into products over time. |
| surface area | The outside part of outermost layer of something. |
| equilibrium | 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 products into reactants happens at the same time. |
