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
711–720 of 869
Question 711
3 marks · Easy
Answer and see the solution →The table shows observations during a student's preparation of hydrated copper(II) sulfate from copper(II) oxide and dilute sulfuric acid.
Step Observation Add excess copper(II) oxide to warm acid Black solid remains Filter the mixture Blue solution collected Heat solution until nearly saturated Blue crystals begin to form when cooled (a)[1 mark]What does the black solid remaining in the beaker show about the reaction?
(b)[1 mark]Why is the solution filtered at this stage?
(c)[1 mark]Explain how the appearance of blue crystals shows the solution is nearly saturated.
Question 712
1 mark · Easy
Answer and see the solution →State why crystallisation is used instead of evaporation to dryness when preparing hydrated salts.
Question 713
3 marks · Easy
Answer and see the solution →Hydrated magnesium sulfate crystals can be prepared using magnesium and dilute sulfuric acid.
(a)[1 mark]Write the balanced symbol equation for the reaction.
(b)[1 mark]State the gaseous product formed.
(c)[1 mark]Write the equation for the crystallisation reaction to form hydrated magnesium sulfate.
Question 714
2 marks · Easy
Answer and see the solution →A student uses 50 cm³ of dilute sulfuric acid in a beaker to prepare a soluble salt. Give the two reasons for heating the acid gently in this experiment.
Question 715
2 marks · Normal
Answer and see the solution →Describe how you would prepare pure, hydrated zinc sulfate crystals starting from zinc oxide and dilute sulfuric acid.
Question 716
4 marks · Normal
Answer and see the solution →(a)[1 mark]State what would be produced if copper(II) sulfate solution was heated to dryness instead of being left to crystallise.
(b)[2 marks]Explain why crystallisation is used to obtain hydrated copper(II) sulfate crystals rather than evaporating to dryness.
(c)[1 mark]Describe a test to confirm if the product is a hydrated salt.
Question 717
3 marks · Normal
Answer and see the solution →Write a balanced chemical equation for the reaction between magnesium carbonate and dilute sulfuric acid to form magnesium sulfate. State the products and their physical states.
Question 718
3 marks · Normal
Answer and see the solution →A student tries to make a pure sample of hydrated magnesium sulfate crystals using magnesium and dilute sulfuric acid.
Explain, in steps, what the student must do to obtain pure crystals and why each step is necessary.
Question 719
4 marks · Normal
Answer and see the solution →A student attempts to make hydrated nickel(II) sulfate crystals. Step Observation Add nickel(II) oxide to warm dilute sulfuric acid Black solid gradually disappears More nickel(II) oxide added Some solid remains at the bottom Filter the mixture Green solution collected Heat solution until some water evaporates Residue remains green Cool the solution Green crystals form (a)[1 mark]Explain why nickel(II) oxide is added in excess (step 2).
(b)[1 mark]Describe the purpose of step 3 (filtration).
(c)[1 mark]Explain why the solution is cooled after heating (step 5).
(d)[1 mark]Suggest a reason why it would be incorrect to heat the green solution to dryness in step 4.
Question 720
1 mark · Normal
Answer and check →Which of the following is the correct balanced equation for the reaction of copper(II) oxide with dilute sulfuric acid to make copper(II) sulfate?
- A.\ce{CuO(s) + H2SO4(aq) -> CuSO4(aq) + H2O(l)}
- B.\ce{CuO(aq) + H2SO4(s) -> CuSO4(l) + H2O(aq)}
- C.\ce{CuSO4(s) + H2SO4(aq) -> CuO(aq) + H2O(l)}
- D.\ce{Cu(s) + H2SO4(aq) -> CuSO4(aq) + H2(g)}