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3 Quantitative chemistry

3 Quantitative chemistry

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Question 12

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 Quantitative chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /3 Quantitative chemistry

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