Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Inorganic Chemistry
869 practice questions
Topics covered
- The Alkali Metals85 practice questions
- The Halogens86 practice questions
- Gases in the Atmosphere86 practice questions
- Reactivity Series163 practice questions
- Extraction and Uses of Metals128 practice questions
- Acids, Alkalis and Titrations83 practice questions
- Acids, Bases and Salt Preparations156 practice questions
- Chemical Tests68 practice questions
Practice questions
721–730 of 869
Question 721
2 marks · Normal
Answer and see the solution →Give two safety precautions you would take when preparing hydrated iron(II) sulfate crystals using dilute sulfuric acid and iron(II) oxide.
Question 722
4 marks · Normal
Answer and see the solution →(a)[1 mark]Define the term 'hydrated salt'.
(b)[2 marks]Explain, with reference to water of crystallisation, how heating a hydrated salt to dryness changes its formula.
(c)[1 mark]How can you tell if a sample of copper(II) sulfate is hydrated or anhydrous? State what you would observe on heating.
Question 723
2 marks · Hard
Answer and see the solution →When making hydrated zinc sulfate crystals from zinc oxide and sulfuric acid, the final solution is left to cool so that crystals form. Explain, in two points, why crystallisation is used instead of evaporation to dryness to obtain hydrated salt crystals.
Question 724
5 marks · Hard
Answer and see the solution →A student prepares hydrated magnesium sulfate crystals by reacting magnesium carbonate with dilute sulfuric acid.
(a)[2 marks]Write the balanced symbol equation for the reaction between magnesium carbonate and dilute sulfuric acid.
(b)[1 mark]State the state symbols for each product.
(c)[2 marks]During the process, the solution is concentrated and then left to crystallise. Write the equation for the crystallisation step, including water of crystallisation.
Question 725
2 marks · Hard
Answer and see the solution →Describe two steps a student must carry out to obtain pure hydrated copper(II) sulfate crystals from a mixture of copper(II) oxide and dilute sulfuric acid, once the reaction has finished.
Question 726
1 mark · Easy
Answer and see the solution →Explain why the titration method must be used when preparing sodium salts from an acid and an alkali.
Question 727
3 marks · Easy
Answer and see the solution →A student wants to prepare pure potassium chloride crystals from potassium hydroxide solution and hydrochloric acid using titration.
(a)[1 mark]State the first step the student should carry out before adding acid.
(b)[1 mark]Describe how the student should use an indicator to find the endpoint of the reaction.
(c)[1 mark]Once the volumes have been determined, explain what the student must do to obtain pure potassium chloride crystals.
Question 728
2 marks · Easy
Answer and see the solution →Explain the role of methyl orange indicator in an acid–alkali titration to prepare potassium salts. Why does the indicator colour change at the endpoint? (2 marks)
Question 729
2 marks · Easy
Answer and see the solution →A student wants to prepare ammonium sulfate by titrating ammonium hydroxide ( ) with sulfuric acid ( ).
Write the balanced chemical equation for this reaction.
Question 730
1 mark · Easy
Answer and see the solution →State why you cannot use the 'add excess solid, then filter' method to prepare sodium salts from acid and sodium hydroxide.