| A | B |
|---|
| Activation energy | the minimum amount of energy required to start a chemical reaction |
| catalyst | a material that increases the rate of a chemical reaction by lowering the activation energy |
| chemical change | a change in matter that produces a new substance |
| chemical equation | a short way to show a chemical reaction using symblos not words |
| coefficient | number placed in front of chemical formula in an equation |
| combustion | a rapid reaction between oxygen and fuel that produces thermal energy |
| concentration | the amount of one material dissolved in a given amout of another material |
| conversation of mass | the principle that states that matter is neither crested nor destroyed during a chemical reaction |
| decomposition | a chemical reaction that breaks down a compound into simpler products |
| endothermic reaction | a reaction that absorbs energy in the form of heat |
| enzyme | a biological catalyst that lowers the activiation energy for reactions in cells |
| exothermic reaction | a reaction that releasesenergy in the form of heat |
| inhibitor | a material that decreases the rate of a chemical reaction |
| precipitate | a solid that forms from a solution during a chemical reaction |
| products | substances formed as the result of a chemical reaction |
| reactants | substances that enter into a chemical reaction |
| replacement | a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places |
| synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
