Skip to content

Course home

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

EasyMedium
12345678910111213141516171819202122232425262728293031
Question 12

Copper is extracted from metal ores.

Chalcocite is a copper ore containing a compound with the formula Cu2S\text{Cu}_2\text{S}Cu2​S.

a.

Cu2S\text{Cu}_2\text{S}Cu2​S reacts with oxygen to produce copper(I) oxide and sulfur dioxide. Complete the equation for this reaction. You should balance the equation.

2Cu2S+→2Cu2O+2SO2 2\text{Cu}_2\text{S} + \text{\quad\quad\quad\quad\quad} \rightarrow 2\text{Cu}_2\text{O} + 2\text{SO}_2 2Cu2​S+→2Cu2​O+2SO2​
[1]
b.

Calculate the percentage by mass of copper in Cu2S\text{Cu}_2\text{S}Cu2​S.

Relative atomic masses (ArA_{\text{r}}Ar​):

  • S=32\text{S} = 32S=32
  • Cu=63.5\text{Cu} = 63.5Cu=63.5
[2]
c.

Describe a chemical test to show the presence of sulfate ions (SO42−\text{SO}_4^{2-}SO42−​) in a solution of copper(II) sulfate. Give the result of the test.

  • Test:
  • Result:
[2]
d.

Copper can be extracted from low-grade ores by phytomining. Describe what is meant by phytomining.

[2]
Markscheme

3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations Questions

  1. GCSE
  2. /Chemistry
  3. /3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations

53 exam-style questions on AQA GCSE Chemistry 3.1 Chemical measurements, conservation of mass and the quantitative interpretation of chemical equations, covering 3.1.1 Conservation of mass and balanced chemical equations, 3.1.2 Relative formula mass, 3.1.3 Mass changes when a reactant or product is a gas, and 3.1.4 Chemical measurements. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank