| A | B |
|---|
| Chemical reaction | Bond between atoms are broken, new bonds form to make different molucules |
| Elements | Consists of atoms of only one type |
| Molecules | Group of atoms held together by covalent bonds |
| Chemical energy | Energy stored in chemical composition of matter |
| Carbohydrates?Sugars | Provide cell with energy |
| Lipids/Fats | Fats oil waxes found in living things |
| Proteins | Smaller molecules called amino acids linked together into long chains |
| Nucleic Acids | Hold instructions for maintenance, growth reproduction of cell DNA RNA |
| Water | about two thirds of the cell is water 2 atoms of hydrogen bonded to one atom of water |
