| A | B |
|---|
| polymer | long chain molecule - repeating unit |
| monomer | simple molecule |
| methane | alkane |
| ethene | alkene |
| isomers | two or more molecules - same formula different structures |
| cracking | forming shorter chain molecules |
| addition reaction | forming only one product |
| combustion | reaction in which heat and light released |
| oxidation | a reactant gains oxygen as it takes place |
| reduction | reactant loses oxygen in reaction |
| hydrocarbon | contains hydrogen and carbon only |
| saturated | contains only single bonds |
| unsaturated | contains C=C |
| fractional distillation | for separating molecules with different boiling points |
| conditions for cracking | heat and catalyst |
| bromine water decolourised | test for unsaturation |
| boiling point increases | chain length increases |
| fractionating column - top | short chains |
| fractionating column - bottom | long chains |
| crude oil | a mixture |
