| A | B |
|---|
| Law of Conservation of Mass | states that in a chemical reaction matter is neither created nor destroyed |
| Coefficient | large number in a chemical reaction that multiplies that molecule |
| Chemical Equation | an equation that uses chemical formulas and symbols to show the reactants and products in a chemical reaction |
| Subscript | small number that follows and element symbol and tells you how many atoms of that element there are |
| Valence Electrons | electrons in the outer energy level that are involved in chemical bonding |
| Yield sign | Óthe arrow in a chemical equation |
| Reactant | a substance that reacts in a chemical change |
| Product | a substance that is produced in a chemical change |
| Synthesis | type of reaction in which two or more reactants become a single product |
| Decomposition | type of reaction where one reactant becomes 2 or more products |
| Combustion | type of reaction where a fuel reacts with oxygen to produce carbon dioxide and water and heat |
| Single Replacement | type of reaction where a single element reacts with a compound and replaces one of the elements in that compound |
| Double Replacement | type of reaction where two compounds react and swap elements |
| Exothermic | a reaction where energy is released in the form of heat |
| Endothermic | a reaction where energy is absorbed and the resulting products cool down |
| Activation Energy | the amount of energy required to overcome in order for the reaction to proceed on its own |
| Catalyst | substance that changes the rate of a chemical reaction without itself being permanently consumed |
| Energy Diagram | graphical representation of what happens to the energy levels within a reaction over time |
| Fusion | the joining together of the nuclei of two atoms which releases great amounts of energy |
| Fission | the splitting of an atomÕs nucleus which releases great amounts of energy |
| Radioisotopes | an isotope of an element which is radioactive |
| Radiation | the transfer of energy by electromagnetic waves |
| Nuclear Medicine | field of medicine that uses radioisotopes to diagnose and treat many diseases of the body |
