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Elements, compounds and mixtures

Elements, compounds and mixtures

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Question 5

A mixture contains copper(II) sulfate and sand. Crystals of pure copper(II) sulfate can be obtained from this mixture using the method described below.

Use words from the box to complete the sentences. You may use each word once, more than once, or not at all.

crystalsdissolveevaporatefiltersolutionsolvent \begin{array}{|cccccc|} \hline \text{crystals} & \text{dissolve} & \text{evaporate} & \text{filter} & \text{solution} & \text{solvent} \\ \hline \end{array} crystals​dissolve​evaporate​filter​solution​solvent​​
  • Grind the mixture into a fine powder.
  • Add the powder to hot water and stir to ____________________ (1)\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (1)}____________________ (1) the copper(II) sulfate.
  • Filter the mixture. The copper(II) sulfate ____________________ (2)\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (2)}____________________ (2) passes through the filter paper, leaving behind the insoluble sand.
  • Heat the filtrate to ____________________ (3)\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (3)}____________________ (3) some of the water.
  • Leave the saturated solution to cool so that ____________________ (4)\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (4)}____________________ (4) of copper(II) sulfate form.
  • Finally, ____________________ (5)\text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_ (5)}____________________ (5) the cold mixture to separate the crystals from the remaining liquid.
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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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