Across
- 2. Number of fractions in the process of refining crude oil
- 6. Coal is a form of __________ energy
- 7. ______ impurities must be removed as they block the active sites of the catalysts used in later chemical processes.
- 8. Burning of fuels
- 10. Crude oil is made of alkanes, aromatic compounds and ____
Down
- 1. Process to refine crude oil
- 3. Minimum number of carbon atoms that can be found in the fractions.
- 4. Most efficient form of coal
- 5. Fossil fuels are produced through _________ respiration
- 9. Most abundant fossil fuel