Edexcel IGCSE Chemistry 4.15 Alkene structures
Practise explaining why sulfur impurities in hydrocarbon fuels are a problem when crude oil fractions are burned.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- explain that sulfur impurities burn to form sulfur dioxide or sulfur trioxide
- link sulfur dioxide from fuel combustion to acid rain or a named acid-rain effect
4.15 Sulfur impurities and sulfur dioxide question 1
[Maximum number: 2]
Crude oil is an important source of organic compounds.
Crude oil often contains sulfur as an impurity.
Explain why this is a problem when using crude oil fractions as fuels.
An explanation which links the following two points:
- when sulfur burns, sulfur dioxide / SOX2 is formed
- this causes acid rain
Allow:
- sulfur trioxide / SOX3
- a specified harmful effect of acid rain
- references to causing / exacerbating respiratory problems
- greenhouse gas / causes global warming / climate change
Ignore:
- sulfur oxides
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