GCSE AQA Chemistry Ionic, Covalent & Metallic Bond: This question is about zinc and

This question is about zinc and compounds of zinc - AQA - GCSE Chemistry - Question 4 - 2022 - Paper 1

Question 4

This question is about zinc and compounds of zinc. A student produces pure crystals of zinc chloride by reacting zinc oxide with hydrochloric acid. The equation fo... show full transcript

Worked Solution & Example Answer:This question is about zinc and compounds of zinc - AQA - GCSE Chemistry - Question 4 - 2022 - Paper 1

Step 1

Give one observation that the student could make to show that the zinc oxide is in excess.

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Answer

The student could observe that unreacted zinc oxide remains as a solid, indicating it is in excess and does not dissolve.

Step 2

Why is excess zinc oxide used rather than excess hydrochloric acid?

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Answer

Excess zinc oxide can be filtered off easily once the reaction is complete, making the process simpler compared to using excess hydrochloric acid.

Step 3

Name one other compound that the student could add to hydrochloric acid to produce zinc chloride.

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Answer

The student could add zinc hydroxide (Zn(OH)₂) or zinc carbonate (ZnCO₃) to hydrochloric acid to produce zinc chloride.

Step 4

Describe how the student should obtain crystals of zinc chloride from a solution of zinc chloride.

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Answer

The student should heat the solution until the crystallisation point is reached, allowing crystals to form. This can be accomplished by evaporating some water, and then allowing the solution to cool or crystallise.

Step 5

Complete the ionic equation for this reaction.

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Answer

Zn + Cu²⁺ → Zn²⁺ + Cu

Step 6

Why is zinc described as being oxidised in this reaction?

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Answer

Zinc is described as being oxidised because it loses two electrons during the reaction.

Step 7

Complete Figure 7 to show how zinc, copper and another substance can be used to light a lamp.

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Answer

The diagram should illustrate a complete circuit with labeled zinc and copper electrodes placed in an electrolyte solution, connected to a lamp represented by the symbol ⊗.

This question is about zinc and compounds of zinc - AQA - GCSE Chemistry - Question 4 - 2022 - Paper 1

Worked Solution & Example Answer:This question is about zinc and compounds of zinc - AQA - GCSE Chemistry - Question 4 - 2022 - Paper 1

Give one observation that the student could make to show that the zinc oxide is in excess.

Why is excess zinc oxide used rather than excess hydrochloric acid?

Name one other compound that the student could add to hydrochloric acid to produce zinc chloride.

Describe how the student should obtain crystals of zinc chloride from a solution of zinc chloride.

Complete the ionic equation for this reaction.

Why is zinc described as being oxidised in this reaction?

Complete Figure 7 to show how zinc, copper and another substance can be used to light a lamp.

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