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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 12

A student investigated the mass of dissolved solids in a brand of mineral water.

The student used the following method:

  1. Measure 100 cm3 of the mineral water sample.
  2. Heat the sample in an evaporating basin until all the water has evaporated.
  3. Measure the mass of the solid residue that remains.
  4. Repeat the experiment three more times.

Table 1

SampleMass of solid residue (g)
10.24
20.26
30.23
40.27
a.

Calculate the mean mass of the solid residue.

[2]
b.

A 250 cm3 sample of mineral water from a different source was found to contain 0.85 g of dissolved solids. Calculate the mass of dissolved solids in 1000 cm3 of this mineral 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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