Questions and Answers
What are naphthalene balls, used to repel moths and insects, obtained from?
Coal tar
What is the origin of the word 'petroleum'?
Greek
Which natural resource is petrol and diesel obtained from?
Petroleum
What is the main component of coal that undergoes carbonisation to form coal?
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What was the original use of coal gas in London and New York?
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Which natural processes led to the burial of dense forests under the soil, eventually forming coal?
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What is the main use of coke obtained from coal processing in industries?
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Which petroleum product is a black, thick liquid with an unpleasant smell?
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What is the primary difference between coal tar and coal gas?
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Why should coal and petroleum resources be used judiciously?
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Which of the following is NOT a product obtained by refining petroleum?
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What is the primary reason behind fossil fuels being exhaustible natural resources?
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Study Notes
Fossil Fuels
- Naphthalene balls, used to repel moths and insects, are obtained from coal tar.
- The word 'petroleum' originates from the Greek words 'petra' meaning rock and 'oleum' meaning oil.
Coal Formation
- Coal is formed from the carbonisation of plant material, primarily cellulose, found in dense forests.
- The natural processes that led to the burial of dense forests under the soil, eventually forming coal, are geological events such as flooding and volcanic eruptions.
Coal Products
- Coke, obtained from coal processing, is primarily used in industries as a reducing agent.
- Coal tar is a black, thick liquid with an unpleasant smell, used in various applications.
- Coal gas was originally used for street lighting in London and New York.
Petroleum Products
- Petrol (gasoline) and diesel are obtained from petroleum, a natural resource.
- Coal gas and coal tar are two distinct products obtained from coal processing, differing in their composition and uses.
Conservation of Resources
- Coal and petroleum resources should be used judiciously due to their exhaustible nature.
- Fossil fuels are exhaustible natural resources because they take millions of years to form, and their rate of consumption is higher than their rate of formation.
- Soil is not a product obtained by refining petroleum.
