Types of chemical reactions

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Question 13
Medium
a.

Which statement about acids and alkalis is correct?

  • Acids form H+\text{H}^+H+ ions in aqueous solution.
  • Alkalis have a pH less than 7.
  • Neutralisation is a reaction that only produces hydrogen gas.
  • Sodium hydroxide is an example of an acid.
[1]
b.

A scientist reacts dilute sulfuric acid with insoluble copper(II) carbonate, CuCO3\text{CuCO}_3CuCO3​. They repeat the experiment two more times.

The table below shows their results:

Experiment 1Experiment 2Experiment 3
Mass of copper(II) sulfate, CuSO4\text{CuSO}_4CuSO4​, produced (g)5.435.495.44
Mass of copper(II) carbonate, CuCO3\text{CuCO}_3CuCO3​, remaining (g)1.251.191.24

Calculate the mean mass of copper(II) sulfate, CuSO4\text{CuSO}_4CuSO4​, made. Give your answer to 3 significant figures.

[2]
c.

Complete the balanced symbol equation for the reaction. Include state symbols. H2SO4(aq)+CuCO3(s)→CuSO4(aq)+……………(…… )+……………(…… )\text{H}_2\text{SO}_4(\text{aq}) + \text{CuCO}_3(\text{s}) \rightarrow \text{CuSO}_4(\text{aq}) + \dots\dots\dots\dots\dots (\dots\dots) + \dots\dots\dots\dots\dots (\dots\dots)H2​SO4​(aq)+CuCO3​(s)→CuSO4​(aq)+……………(……)+……………(……)

[2]
d.

How does the scientist remove the unreacted solid copper(II) carbonate, CuCO3(s)\text{CuCO}_3(\text{s})CuCO3​(s)?

[1]
e.

How does the scientist obtain pure dry copper(II) sulfate crystals from copper(II) sulfate solution?

[1]

Types of chemical reactions Questions

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