| A | B |
|---|
| reactant | compounds on the left of the reaction arrow |
| product | compounds on the right of the reaction arrow |
| precipitate | a product settling out of a solution |
| effervescence | bubbling off of a product |
| catalyst | a substance that changes the rate of the reaction without being either a reactant or product |
| activation energy | energy required to start a reaction |
| exothermic reaction | a reaction that gives off energy to the surrounding |
| endothermic reaction | a reaction that absorbs energy from the surroundings |
| conservation of mass | a chemical law stating that the mass of the products equals the mass of the reactants |
| conservation of atoms | a chemical law stating that the number of each kind of atom must be the same on the product side of the reaction arrow as on the reactant side of the reaction arrow |
| activated complex | the reactants and the energy necessary for the reaction to begin |
| spectator ions | ions in solution both at the beginning and the end of a reaction |
| decomposition reaction | reaction in which a large complex substance breaks down into smaller substances |
| synthesis reaction | reaction in which small substances are combined into a more complex substance |
| combustion | reaction involving a flammable substance and oxygen |
| ----> | yields |
| ∆H | add heat |
| <=> | a reversible reaction |
