| A | B |
|---|
| Fuel | a substance that releases useful amounts of energy when burned |
| Oxygen | the gas in the air that fuels react with when they burn |
| Hydrocarbons | Many fuels are -------- |
| Combustion | another word for burn! |
| Complete combustion | makes CO2 and H2O when fuel burns |
| Incomplete combustion | happens when there is not enough oxygen when the fuel burns |
| Carbon monoxide | produced when incomplete combustion takes place |
| Carbon dioxide | contributes to the Greenhouse Effect |
| Exothermic reaction | heat given out during the reaction |
| Endothermic reaction | enrgy absorbed during the reaction |
