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
701–710 of 869
Question 701
3 marks · Normal
Answer and see the solution →Copper(II) sulfate can be made by adding excess copper(II) oxide to dilute sulfuric acid.
(a)[1 mark]Explain why an excess of copper(II) oxide is added during the preparation.
(b)[2 marks]Describe what the student should do after all the acid has reacted, to obtain dry copper(II) sulfate crystals.
Question 702
4 marks · Normal
Answer and see the solution →The table below shows the solubility of different ionic compounds in water:
Solubility of Various Ionic Compounds in Water Compound Solubility Potassium nitrate Soluble Sodium chloride Soluble Calcium sulfate Almost insoluble Lead(II) chloride Insoluble Ammonium carbonate Soluble Copper(II) hydroxide Insoluble (a)[1 mark]Name one compound from the table that is insoluble in water.
(b)[1 mark]State the general rule for the solubility of nitrates.
(c)[2 marks]Identify a compound from the table that would be suitable for making a salt by precipitation, and explain your choice.
Question 703
2 marks · Normal
Answer and see the solution →State the solubility rules for (i) all chlorides, and (ii) all hydroxides, in water.
Question 704
2 marks · Hard
Answer and see the solution →State two exceptions to the general solubility of chlorides in water. For each exception, name the insoluble chloride.
Question 705
5 marks · Hard
Answer and see the solution →You are asked to prepare a pure, dry sample of magnesium sulfate in the laboratory using insoluble magnesium carbonate and dilute sulfuric acid.
(a)[2 marks]Explain why magnesium carbonate and sulfuric acid can be used to prepare magnesium sulfate by this method.
(b)[3 marks]Describe the steps you would take to obtain a pure, dry sample of magnesium sulfate from these reactants.
Question 706
2 marks · Hard
Answer and see the solution →State the general solubility rules for carbonates and hydroxides of common metals in water.
Question 707
1 mark · Easy
Answer and see the solution →Write a balanced chemical equation for the reaction between magnesium and dilute sulfuric acid to form magnesium sulfate.
Question 708
3 marks · Easy
Answer and see the solution →A student is making hydrated iron(II) sulfate crystals using dilute sulfuric acid and iron(II) oxide.
(a)[1 mark]State why the student adds excess iron(II) oxide to the acid.
(b)[1 mark]Describe how the student removes the unreacted iron(II) oxide from the mixture.
(c)[1 mark]Explain what the student should do next to obtain hydrated iron(II) sulfate crystals.
Question 709
2 marks · Easy
Answer and see the solution →A student tries to obtain hydrated magnesium sulfate crystals by evaporating the solution to dryness instead of crystallising it.
Explain, in two points, why this method does not produce hydrated crystals.
Question 710
2 marks · Easy
Answer and see the solution →Explain, using balanced equations, why hydrogen gas is produced when magnesium reacts with dilute sulfuric acid to make magnesium sulfate.