| A | B |
|---|
| Chemistry | study of matter and how matter changes |
| Decomposition Reaction | breaking down compound into elements |
| Activation Energy | Energy needed to start a reaction |
| Endothermic | absorbing energy |
| Exothermic | giving off energy |
| Chemical Change | something new formed; bonds are broken or formed |
| Physical Change | nothing new formed |
| Chemical Equation | shortened way to show chemical reaction |
| Energy | Every chemical reaction involves a change in this |
| Open System | matter can enter or escape |
| Closed System | matter cannot enter or escape |
| Inhibitor | decreases rate of chemical reaction |
| Chemical Formula | H2O |
| Subscript | number following symbol that shows how much of that element you have |
| Coefficient | number written in front of formula to show number of molecules |
| Enzyme | speeds up reactions |
| Conservation of Mass | matter cannot be created or destroyed |
| exothermic reaction has | less energy than reactants |
| combustion | exothermic reaction |
| endothermic reactions | require more energy to break bonds in reactants than is released |
