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Elements, compounds and mixtures

Elements, compounds and mixtures

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Question 2

A mixture contains benzoic acid and silicon dioxide. A pure sample of benzoic acid can be recovered 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.

crystalsdissolvefilterfiltrateresiduesolutionsolvent \begin{array}{|ccccccc|} \hline \text{crystals} & \text{dissolve} & \text{filter} & \text{filtrate} & \text{residue} & \text{solution} & \text{solvent} \\ \hline \end{array} crystals​dissolve​filter​filtrate​residue​solution​solvent​​
  • Add the mixture to hot water and stir to ____________________ (1) the benzoic acid.
  • Filter the hot mixture. The silicon dioxide remains on the filter paper as the ____________________ (2).
  • The benzoic acid ____________________ (3) passes through the filter paper.
  • Allow the hot liquid to cool slowly in an ice bath so that ____________________ (4) of benzoic acid form.
  • Finally, ____________________ (5) the cold mixture to isolate the pure solid benzoic acid 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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