"Edexcel IGCSE Crude Oil Crossword": HTML5 Crossword

Across

4. Used in Cracking (7)
8. Breaking useless long chain molecules into more useful shorter chain molecules (8)
12. A substance that exothermically combusts (4)
13. These forces increase as molecules get bigger (14)
14. Smaller molecules are more ............... (8)
16. Carbon monoxide binds irreversibly with ................ (11)
17. Nitrogen diatomics are generally inert due to their ........... bond (6)
18. Used a fuel in aviation (8)
19. Your 4x4 probably runs on this (6)

Down

1. Non-Metal oxides are ............ (6)
2. Heaviest Fraction (7)
3. Cracking modifies the supply to cater for the ........... (6)
5. This type of combustion yields hazardous products (10)
6. Removing sulphur and nitrogen oxides from waste gases (9)
7. Another word (used in America) for Petrol (8)
9. This impurity is often found in fossil fuels (7)
10. Process that occurs in a tower/column (12)
11. Crude oil is very .............. (7)
12. Crude Oil is a ............. resource (6)
15. Groups of molecules separated according to their similar boiling points (9)