| Term | Definition |
| Organic Compound | any compound of carbon and another element |
| Hydrocarbon | any class of coumpounds containing only one carbon, methane, ethyl, or benzene |
| Isomers | two or more substances that are made of the same elements in the same proportions, but differ in the arrangement of atoms |
| Saturated Hydrocarbon | when the chain carries the complete set of hydrogen atoms |
| Alkanes | hydrocarbons that are connected by single bonds |
| Straight chains | an arrangement of atoms of the same type that form an unbranched open chain |
| Branched Chains | an open chain of atoms that has one or more side chains attached to it |
| Rings | a group of atoms linked by bonds [closed chains] |
| Unsaturated Hydrocarbon | when the chain does not carry the complete set of hydrogen atoms |
| Alkenes | any group of open chaine hydrocarbons that are linked together by double bonds |
| Alkynes | open chained hydrocarbons that are linked together by triple bonds |
| Aromatic hydrocarbons | hydrocarbons that taste and smell good; have strong odors |
| Combustion of fossil fuels | when carbon dioxide and water mix together |
| Complete Combustion | combustion out in the open; when fire burns carbon dioxide is made when the fumes mix with oxygen... |
| Acid Rain | rain containing acids that combine with water because of indsutrial gas emissions; burning of hydrocarbons |
| Polymers | natural: cotton, silk, flax; synthetic: nylon, rubber, polyethylene |
| Monomer | a molecule with low molecular weight that can react with identical or different molecules of low molecular weight in order to form a polymer |
| Photosynthesis | sunlight is the main source of energy; creates sugar and oxygen |