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