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| Chemical equation | a short, easy way to show a chemical reaction, using symbols instead of words |
| Subscript | a number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound |
| Reactants | a substance that enters into a chemical reaction |
| Products | a substance formed as a result of a chemical reaction |
| Conservation of Mass | the principle stating that matter is not created or destroyed during a chemical reaction |
| Coefficient | a number placed in front of a chemical formula in an equation that indicates how many atoms or molecules of each reactant and product are involved in a reaction |
| Synthesis | a chemical reaction in which two or more simple substances combine to form a new, more complex substance |
| Decomposition | a chemical reaction that breaks down a compound into simpler products |
| Replacement reaction | a substance that enters into a chemical reaction |
| Activation energy | the minimum amount of energy needed to start a chemical reaction |
| Concentration | the amount of one material dissolved in a given amount of another material |
| Catalyst | a material that increase the rate of a chemical reaction by lowering the activation energy |
| Enzyme | a biological catalyst that lowers the activation energy of reactions in cells |
| Inhibitor | a material that decreases the rate of a reaction |
| Combustion | a rapid reaction between oxygen and fuel that produces thermal energy |
| Fuel | a material that releases energy when it burns |
