Fuels Quiz
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5 questions, one answer each
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1. What elements does a hydrocarbon contain?
- A. Carbon and oxygen only
- B. Carbon and hydrogen only
- C. Carbon, hydrogen and oxygen
- D. Hydrogen and oxygen only
2. Which fraction of crude oil is used as fuel for cars?
- A. Bitumen
- B. Kerosene
- C. Petrol
- D. Fuel oil
3. In fractional distillation, why do short-chain hydrocarbons collect near the top of the column?
- A. They are denser than long-chain hydrocarbons
- B. They have lower boiling points so remain as vapour until they reach the cooler top
- C. They react with oxygen at the top
- D. They are added to the column at the top
4. A gas boiler burns with a yellow, sooty flame and produces a smell of fumes. What does this suggest?
- A. Complete combustion is occurring
- B. Incomplete combustion is occurring, likely producing carbon monoxide and soot
- C. The gas is not a hydrocarbon
- D. The flame temperature is too high
5. A company wants to increase the yield of petrol from a barrel of crude oil that naturally contains more long-chain fractions than short-chain ones. Which process should they use, and why?
- A. Fractional distillation, because it creates new short-chain molecules
- B. Cracking, because it breaks large saturated hydrocarbons into smaller, more useful molecules
- C. Combustion, because it converts hydrocarbons directly into petrol
- D. Fermentation, because it produces alkanes from sugars