Chemistry Unit 1 Revision Questions

Revision Questions based on the Edexcel GCSE chemistry specification for 2014.

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C1: Chemistry in our World
Topic 1 ­ The Earth's sea and atmosphere
1. What produced the gases that formed the early atmosphere?
2. What did the early atmosphere contain?
3. Why are there different sources of information about the atmosphere? Why does
this make it difficult to be precise about the early atmosphere?
4. How did condensation of water vapour form oceans?
5. How was the amount of carbon dioxide in the atmosphere reduced?
6. How did the growth of primitive plants affect the composition of the atmosphere?
7. How can you investigate the proportion of oxygen in the atmosphere?
8. What is the current composition of the atmosphere?
9. What causes small changes in the atmosphere?
Topic 2 ­ Materials from the Earth
1. What are igneous rocks formed from? What are they made of? What is an example?
2. What are two examples of sedimentary rocks?
3. How are sedimentary rocks formed?
4. What may sedimentary rocks contain? What are they susceptible to?
5. What is an example of a metamorphic rock?
6. How are metamorphic rocks formed?
7. What types of rock exist in the Earth's crust and are all forms of calcium carbonate?
8. What are the economic, environmental and social effects of quarrying limestone?
9. Why is so much calcium carbonate needed? What is it used for?
10. What is thermal decomposition? How does this affect calcium carbonate?
11. How can you investigate the ease of thermal decomposition of carbonates?
12. How does thermal decomposition differ for different metal carbonates?
13. What are atoms in terms of experiments? Are they created or destroyed? What
happens instead?
14. What effect does water have on calcium oxide?
15. What is produced when calcium hydroxide dissolves in water?
16. What can a precipitation reaction show practically in terms of mass before and after a
reaction?
17. How can calcium oxide, calcium hydroxide and calcium carbonate be used to
neutralise soil acidity?
18. How can calcium carbonate remove acidic gases from coal-fired power stations?
How does this protect the environment?
Topic 3 ­ Acids
1. Where is hydrochloric acid produced in humans? What does this do?

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What are indigestion remedies?
3. How can you investigate the effectiveness of different indigestion remedies?
4. What are acids neutralised by?
5. What does hydrochloric acid, nitric acid and sulphuric acid produce?
6. What is electrolysis?
7. How can you investigate electrolysis of dilute hydrochloric acid?
8. What is the chemical test for hydrogen?
9. What is the chemical test for chlorine?
10. Where can chlorine be obtained from? How?
11. What is chlorine? What can this lead to?
12.…read more

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What is the chemical test for carbon dioxide?
8. What can the incomplete combustion of hydrocarbons produce?
9. How does carbon monoxide behave?
10. What are the problems caused by an incomplete combustion?
11. Why do impurities in some hydrocarbon fuels result in the production of sulphur
dioxide?
12. What are some problems associated with acid rain? What causes this?
13. How do various gases in the atmosphere trap heat? What does this cause?
14. Why does the Earth's temperature vary?
15.…read more

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