Chemistry Unit 3 Revision Questions

Revision Questions based on the Edexcel GCSE chemistry specification for 2014

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C3: Chemistry in action
Topic 1 ­ Qualitative Analysis
1. What are the different types of analysis? What does that mean?
2. Why must the test for an ion be unique?
3. What tests show the presence of ions and which ions do they show?
4. What do these tests do for chemists doing what?
Topic 2 ­ Quantitative Analysis
1. How can you calculate the concentration of solutions? What is the unit?
2. What have some areas of the country done to make the water hard?
3. What are some problems caused by hard water?
4. What two things can hard water be? How can boiling affect one of these?
5. How can hard water be softened
6. What can the amount of substance be measured in?
7. How can you convert masses of substances into moles of particles of the
8. How can you convert in g dm -3 into mol dm -3 and vice versa?
9. What happens if soluble salts are prepared from an acid and an insoluble reactant?
10. What happens if soluble salts are prepared from an acid and a soluble reactant?
11. What is an acid-based titration?
12. How can you carry out simple acid-based titrations?
13. How can you calculate an unknown concentration of a solution or unknown volume
by using the results of titrations?
Topic 3 ­ Electrolytic Processes
1. What are electrolytes?
2. What happens in the movement of ions during electrolysis?
3. What can oxidation involve
4. Where does reduction occur? Where does oxidation occur?
5. How do you write half equations for reactions? Write one for molten potassium
6. How is sodium manufactured?
7. Where can sodium be used?
8. How are the products formed in the electrolysis of sodium chloride solution?
9. What does the electrolysis of aqueous solutions give? Rather than what?
10. How do products form in the process of electrolysis, using inert electrodes, of some
electrodes including, copper chloride solution, copper sulphate solution, sodium
sulphate solution and molten lead bromide?
11. How is copper purified by electrolysis?

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How can electroplating be used to improve the appearance and/or resistance to
corrosion of metal objects?
Topic 4 ­ Gases, Equilibria and Ammonia
1. What does one mole of any gas occupy in dm3 at room temperature and
atmospheric pressure? What is this known as?
2. How can you use molar volume and balances equations in calculations involving the
masses of solids and volumes of gases?
3. What is avogadros law? How can you use this to calculate volumes of gases?
4.…read more

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What are the uses of esters and polyesters?
15. What can polyesters be recycled to form?
16. What are oils and fats?
17. How can oils and fats be broken down?
18. How does soap remove dirt or grease?
19.…read more



Brilliant! But an answer sheet would be useful too :3

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