Chemistry revision

3. A substance that is not mixed or adulterated with any other substance or material.
4. phase The liquid or gas that flows through a chromatography system, moving the materials in a mixture.
5. Units that make up a polymer
8. A substance that speeds up a reaction without being used up
10. It contains two or more types of atom joined together
11. hydrocarbon Compounds that contains at least one double covalent bond between carbon atoms
14. phase The solid or liquid that allows the material in the mixtures to bind with it in a chromatography system.
16. The process of the breaking down of hydrocarbons (alkanes) to make more useful smaller hydrocarbons
17. point The temperature at which a substances melt. Turning from solid to a liquid

1. oil A mixture of different sized hydrocarbon molecules
2. It contains just one type of atom
6. A substance that has two or more elements or compound
7. Molecules that are made from hydrogen and carbon atoms only
9. A word to describe how easily a liquid flows
12. decomposition It is the breakdown of compounds into simpler substances by heating
13. Compounds that only contains single covalent bonds between carbon atoms
15. point The temperature at which a substances boils. Turning from a liquid to a gas.