1. Which one of the following statements about crude oil is NOT correct?
- A. Crude oil is a renewable resource
- B. Most compounds in crude oil are hydrocarbons
- C. Crude oil is the remains of ancient biomass that was buried in mud
- D. Crude oil is a mixture of a very large number of compounds
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Q2-5: Crude oil is separated into different fractions by fractional distillation. |
Terry Joyce | CC by S.A. 2.0
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2. Before entering the column the crude oil must be ..
- A. cooled to condense it
- B. cooled to evaporate it
- C. heated to condense it
- D. heated to evaporate it
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3. As the molecules in crude oil rise up the fractionating column they …
- A. cool down and evaporate
- B. cool down and condense
- C. heat up and condense
- D. heat up and evaporate
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4. The physical property which allows the different fractions in crude oil to be collected at different heights in the column is ..
- A. boiling point
- B. density
- C. melting point
- D. viscosity
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5. The fraction which collects at the top of the column has …
- A. small molecules with a low boiling point
- B. small molecules with a high boiling point
- C. large molecules with a low boiling point
- D. large molecules with a high boiling point
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Q6-7: Four fractions obtained from fractional distillation of crude oil are heavy fuel oil, petrol, kerosene and diesel. The fraction which ….. |
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| 6. ...has the highest boiling point is
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| 7. ...contains molecules with the least number of carbon atoms is
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8. As the number of carbon atoms in a hydrocarbon molecule increases the flamability, boiling point and viscosity change in the following way:
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flamability |
Boiling point |
viscosity |
| A |
decreases |
decreases |
decreases |
| B |
decreases |
increases |
increases |
| C |
increases |
increases |
decreases |
| D |
increases |
increases |
increases |
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9. The correct word equation for the complete combustion of a hydrocarbon fuel is ..
- A. fuel + oxygen → carbon dioxide + water
- B. fuel + oxygen → carbon dioxide + hydrogen
- C. fuel + oxygen → carbon monoxide + water
- D. fuel + oxygen → carbon monoxide + hydrogen
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10.
Hydrocarbons are molecules containing…
- A. carbon and hydrogen atoms
- B. carbon and hydrogen atoms only
- C. only single C-C and C-H bonds
- D. at least one double C=C bond
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