Types of chemical reactions

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Question 1
Medium
a.

Which statement about acids and alkalis is correct?

  • Soluble bases are called alkalis.
  • Acids have a pH of greater than 7.
  • Alkalis turn blue litmus paper red.
  • Hydrochloric acid, HCl\text{HCl}HCl, is a weak acid.
[1]
b.

A scientist reacts sulfuric acid with insoluble copper(II) carbonate, CuCO3\text{CuCO}_3CuCO3​.

They repeat the experiment two more times. The table shows their results.

Experiment 1Experiment 2Experiment 3
Mass of copper(II) sulfate, CuSO4\text{CuSO}_4CuSO4​, produced (g)5.625.685.61
Mass of copper(II) carbonate, CuCO3\text{CuCO}_3CuCO3​, remaining (g)1.451.411.46

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)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?

[2]

Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /Types of chemical reactions