| A | B |
|---|
| atom | smallest unit of matter |
| compound | different atoms of different elements bonded together |
| electrons | energy levels outside of nucleus |
| ion | an atom that has gained or lost one or more electrons |
| ionic bond | formed between oppositely charged ions |
| covalent bond | forms when atoms share a pair of electrons |
| polar molecule | has slightly charged regions |
| nonpolar molecule | does not have charged regions |
| solution | when one substance dissolves in another |
| solvents | dissolve other substances |
| solute | dissolves in another substance |
| acid | releases a hydorgen ion when it dissolves |
| base | removes hydrogen ions from a solution |
| lipids | nonpolar molecules that include fats, oils and cholesterol |
| enzymes | catalysts for chemical reactions in living things |
