| A | B |
|---|
| organic compounds | contain the element carbon |
| hydrocarbon | made up of hydrogen and carbon atoms |
| saturated hydrocarbons | carbon atoms are single-bonded |
| unsaturated hydrocarbons | carbon atoms are double or triple bonded |
| isomers | identical chemical formulas but different molecular structures |
| aromatic compounds | contain the benzene ring structure |
| substituted hydrocarbon | hydrogen atoms replaced by other elements |
| alcohol | hydrogen replaced by OH group(hydroxyl) |
| polymer | huge molecules made of smaller organic molecules |
| protein | formed from amino acids |
| nucleic acid | control the activities and reproduction of cells |
| carbohydrates | contain twice as many hydrogen atoms as oxygen atoms |
| lipid | fats and oils |
| biomass | energy source made from wood, crops, and animal waste |
| biogas | mixture of gases produced from biomass |
| energy farming | growing plants to use as fuel |
| gasohol | biomass fuel mixture of ethanol and gasoline |
