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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

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Question 6

An environmental analyst investigated the mass of microplastics in a local river downstream from an industrial area.

The analyst used the following method:

  1. Filter a 50 cm3 sample of the river water through a fine mesh.
  2. Dry the collected microplastic residue in a desiccator.
  3. Measure the mass of the dry microplastics obtained.
  4. Repeat the experiment three more times.

Table 1

SampleMass of microplastic residue (g)
10.045
20.041
30.048
40.042
a.

Calculate the mean mass of the microplastic residue.

[2]
b.

A 150 cm3 sample of water collected from a different location was found to contain 0.36 g of microplastics. Calculate the mass of microplastics in 1000 cm3 of this water.

[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.

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