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Edexcel IGCSE Chemistry B Elements Compounds and Mixtures Questions

Practise mixtures questions by classifying formulae or diagrams, choosing separation methods and using chromatogram distances or spots.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Classify elements, compounds and mixtures from formulae, names or particle diagrams.
  • Choose filtration, crystallisation, distillation or chromatography for a named mixture.
  • Interpret chromatogram spots and calculate Rf from dye and solvent-front distances.

Covered syllabus points

1.8 Elements, compounds and mixtures1.9 Pure substances and mixtures1.10 Separation techniques1.11 Chromatograms1.12 Rf values1.13 Paper chromatography practical

Question 1

[Maximum number: 2]

This question is about gases.

Question (a)

(a)

The table gives information about five gases.

Table for Question (a) — Edexcel IGCSE Chemistry

Use information from the table to answer these questions.
Each gas may be used once, more than once or not at all.

[ 2 ]

Question (i)

(i)

Give the name of the gas that is a compound.

[ 1 ]

Question (ii)

(ii)

Give a reason why it is not possible to give information for air in the table.

[ 1 ]

Question 2

[Maximum number: 3]

A student has two solids, X and Y .

One of these solids is a pure substance and the other is a mixture.
Describe how the student could identify which solid is pure and which is a mixture by measuring a physical property of each solid.

Question 3

[Maximum number: 2]

This question is about apparatus used in the laboratory.

The diagram shows apparatus used to obtain pure water from sodium chloride solution by simple distillation.

Figure for Question 3 — Edexcel IGCSE Chemistry

Explain why it is necessary for water to flow continuously in and out of the apparatus.

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