1. Why does distillation work?
- Because the liquids are made of one pure substance
- Because it has the right conditions
- Because the liquids have different boiling points
- Because the liquids are mixed up
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2. Fractional distillation is a...
- good way to separate things
- chemical reaction
- physical change
- thermal decomposition reaction
3. What is cracking?
- Burning fuel to make energy
- Making small hydrocarbons into bigger hydrocarbons
- Breaking large hydrocarbons into smaller, more useful hydrocarbons as well as an alkene, which is used for polmerisation
- Crude oil is separated into different fractions, with a similar number of carbon atoms
4. Why do large hydrocarbons have high boiling points?
- They just do
- As there are less weak intermolecular forces to break, we can just us a lot of thermal energy to break them
- As there are more weak intermolecular forces between the hydrocarbon molecules that are needed to be broken, more thermal energy is needed to break these forces thus giving it a high boiling point
- They have longer hydrocarbon chains so more energy is needed to break the chains
5. During fractional distillation...
- crude oil stays as crude oil
- substances with high boiling points condense at the bottom and substances with lower boiling points condense at the top
- substances with low boiling points condense at the bottom and substances with high boiling points condense at the top
- hydrocarbons are chemically separated into smaller hydrocarbons