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8.1 Purity, formulations and chromatography

8.1 Purity, formulations and chromatography

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Question 9

An industrial chemist analyzes a sample of a premium insect repellent spray. Table 1 shows the mass of each substance in a sample of this mixture.

Table 1

SubstanceMass (g\text{g}g)
Ethanol118.5118.5118.5
DEET32.432.432.4
Lavender oil6.36.36.3
Aloe vera extract2.82.82.8
a.

What general chemical term is given to a mixture that has been designed as a useful product, such as this insect repellent?

[1]
b.

Calculate the percentage by mass of DEET in this sample of insect repellent. Give your answer to 1 decimal place.

[2]
c.

Ethanol in the mixture can be oxidised to form ethanoic acid. What type of reagent is required to react with ethanol to bring about this chemical change?

[1]
Markscheme

8.1 Purity, formulations and chromatography Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Purity, formulations and chromatography

28 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.

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