Across
- 1. __________ can be added to alkenes to turn them into alkanes.
- 5. When hydrocarbons burn, this gas is produced.
- 6. Incomplete combustion produces not carbon dioxide, but carbon _____________.
- 7. Cracking needs high temperatures and a ___________________.
- 8. These compounds have the general formula CnH2n+2
- 11. The correct name for aircraft fuel is what?
- 12. One of the heaviest fractions of crude oil is tar, also known as _______________.
Down
- 1. Compounds that contain hydrogen and carbon only are called this.
- 2. Substances in crude oil can be separated by fractional ___________________.
- 3. This substance was made by heat and pressure on dead marine plants and animals over a long period of time.
- 4. Alkenes turn ___________ water colourless.
- 7. This process makes useful hydrocarbon molecules, including alkenes.
- 9. CO2 is a _______ gas which contributes to global warming..
- 10. Alkenes contain a double __________.