Quick quiz on the basics of C1a

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  • Created by: iram_f
  • Created on: 29-05-14 14:07

1. What is cracking?

  • Crude oil is separated into different fractions, with a similar number of carbon atoms
  • Breaking large hydrocarbons into smaller, more useful hydrocarbons as well as an alkene, which is used for polmerisation
  • Making small hydrocarbons into bigger hydrocarbons
  • Burning fuel to make energy
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2. Why do large hydrocarbons have high boiling points?

  • They just do
  • 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
  • As there are less weak intermolecular forces to break, we can just us a lot of thermal energy to break them

3. During fractional distillation...

  • hydrocarbons are chemically separated into smaller hydrocarbons
  • substances with high boiling points condense at the bottom and substances with lower boiling points condense at the top
  • crude oil stays as crude oil
  • substances with low boiling points condense at the bottom and substances with high boiling points condense at the top

4. Why does distillation work?

  • Because the liquids have different boiling points
  • Because it has the right conditions
  • Because the liquids are mixed up
  • Because the liquids are made of one pure substance

5. Small hydrocarbons...

  • are often liquid
  • are always solid
  • have a low boiling point and are gaseous
  • have a high boiling point
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