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Elements, compounds and mixtures

Elements, compounds and mixtures

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Question 9
a.

The table shows some mixtures and methods of separation.

Identify the best method of separation for each mixture.

SeparationChromatographySimple distillationFiltrationFractional distillation
P: yellow dye from a mixture of food dyes
Q: propanone from a mixture of propanone and water
R: clay from a mixture of clay and water
S: pure water from sea water
[4]
b.

Which of the mixtures PPP, QQQ, R R\,R or S S\,S contains an insoluble solid?

[1]
c.

Pure dry crystals of copper(II) sulfate can be obtained from copper(II) sulfate solution by crystallisation.

The following steps describe the method, but they are in the wrong order:

  • A: allow the solution to cool to room temperature
  • B: pour the mixture of crystals and solution through filter paper
  • C: heat the solution to evaporate some of the water
  • D: put the crystals in a warm place to dry
  • E: dip a glass rod into the solution to see if crystals form

Show the correct sequence of steps by writing the letters in the empty boxes below. One letter has been filled in for you:

AEAAA \boxed{\phantom{\text{A}}} \quad \boxed{\text{E}} \quad \boxed{\phantom{\text{A}}} \quad \boxed{\phantom{\text{A}}} \quad \boxed{\phantom{\text{A}}} A​E​A​A​A​
[2]
Markscheme

Elements, compounds and mixtures Questions

  1. IGCSE
  2. /Chemistry
  3. /Elements, compounds and mixtures

29 exam-style questions on Edexcel IGCSE Chemistry Elements, compounds and mixtures. Each one has a worked solution and a mark scheme showing where the marks go.

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