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
321–330 of 359 · Easy
Question 321
5 marks · Easy
Answer and see the solution →This question is about the reactions of acids with different substances.
(a)[1 mark]State the general word equation for the reaction between a metal and an acid.
(b)[1 mark]Write a balanced symbol equation for the reaction between magnesium and dilute sulfuric acid.
(c)[1 mark]State the general word equation for the reaction between a metal oxide and an acid.
(d)[2 marks]Name the salt and the other product formed when copper(II) oxide reacts with dilute hydrochloric acid.
Question 322
5 marks · Easy
Answer and see the solution →This question is about preparing soluble salts using different methods.
(a)[1 mark]State why it is necessary to use an excess of the solid when preparing copper(II) sulfate from copper(II) oxide and sulfuric acid.
(b)[1 mark]Give one reason why you do not use the same 'excess solid' method for making sodium sulfate using sodium hydroxide and sulfuric acid.
(c)[1 mark]Give the name of the technique used instead to make sodium sulfate from sodium hydroxide and sulfuric acid.
(d)[2 marks]Explain briefly how you know when to stop adding acid during the preparation of sodium sulfate by this technique.
Question 323
5 marks · Easy
Answer and see the solution →This question is about the formation of crystals when preparing soluble salts.
(a)[2 marks]Explain why crystallisation is used instead of evaporating to dryness when making hydrated copper(II) sulfate crystals.
(b)[3 marks]Describe, in order, the steps taken after completing a titration to obtain pure sodium sulfate crystals from sodium hydroxide and sulfuric acid.
Question 324
5 marks · Easy
Answer and see the solution →This question is about preparing soluble salts and writing chemical equations for their formation.
(a)[2 marks]Write the balanced chemical equation for the reaction used to prepare hydrated magnesium sulfate crystals using magnesium carbonate and dilute sulfuric acid.
(b)[1 mark]A student wants to prepare pure sodium chloride crystals from sodium hydroxide and hydrochloric acid. Write the balanced chemical equation for this reaction.
(c)[1 mark]State one key difference between the methods used for preparing magnesium sulfate crystals and sodium chloride crystals in the laboratory.
(d)[1 mark]Calculate the mass of sodium chloride produced when 0.100 mol of hydrochloric acid reacts completely with sodium hydroxide. (Relative formula mass, NaCl = 58.5)
Question 325
1 mark · Easy
Answer and see the solution →State the colour change observed when ammonia gas is tested with damp red litmus paper.
Question 326
3 marks · Easy
Answer and see the solution →(a)[1 mark]Describe how anhydrous copper(II) sulfate can be used to test an unknown liquid for water.
(b)[1 mark]State the colour change you would see if water is present.
(c)[1 mark]Explain if this test indicates whether the water is pure.
Question 327
2 marks · Easy
Answer and see the solution →Explain why measuring the boiling point of a liquid is used to test the purity of water. What result should you obtain if the water sample is pure?
Question 328
3 marks · Easy
Answer and see the solution →A student tested three samples of gas (A, B, and C) using damp red litmus paper. Their results are recorded in the table below.
Results of gas tests using damp red litmus paper Sample Observation A Red litmus paper turns blue B No change C Red litmus paper turns white (a)[1 mark]Identify the sample that contains ammonia.
(b)[1 mark]Give a reason for your answer to part (a).
(c)[1 mark]Suggest the gas that could be present in sample C.
Question 329
1 mark · Easy
Answer and see the solution →State the melting (freezing) point of pure water at 1 atmosphere pressure.
Question 330
3 marks · Easy
Answer and see the solution →(a)[2 marks]Describe the steps for testing a sample for ammonia gas using litmus paper.
(b)[1 mark]Explain why the litmus paper must be damp.