Chemistry Crossword

2. This is released in combustion alongside carbon dioxide (5)
3. A resource that is being used up more quickly than it is made - it will run out (6)
4. A saturated hydrocarbon, forms only single bonds (6)
6. The positive particle found in the nucleus(6)
9. A reaction where fuel burns in oxygen (10)
10. The bigger number next to an element that is the same as the number of protons plus the number of neutrons (4, 6)
11. An unsaturated hydrocarbon, contains at least one carbon-carbon double bond (6)
12. Released by cows (7)
14. A mixture formed over millions of years from dead organisms e.g. plankton (5,3)

1. The greenhouse gas which is released by car engines (6,7)
4. The smaller number next to an element that is the same as the number of protons (6, 6)
5. The process used to separate out the liquids in crude oil (10,12)
7. The negative particle, found in shells around (8) the nucleus
8. A resources that can be replenished as it is used up (9)
13. The neutral particle found in the nucleus (7)