| A | B |
|---|
| catalyst | lowers the activation energy |
| temperature | measure of the kinetic energy (motion) of molecules |
| endothermic reaction | energy is absorbed (enters) |
| exothermic reaction | energy is released (exits) |
| Law of conservation of mass | mass of reactants equals mass of products |
| Law of conservation of energy | energy is neither created nor destroyed |
| reactant | left side of equation, enters reactions |
| product | right side of equation, produced by reaction |
| covalent bond | 2 or more nonmetals share electrons |
| ionic bond | a metal and a nonmetal transfer electrons |
| molecule | 2 or more atoms formed by a covalent bond |
| diatomic molecule | covalent bonding between atoms of the same element |
| crystal lattice | arrangement of ions in an ionic bond |
| valence electrons | electrons in the outermost energy level that are involved in bonding |
