Scientists use different techniques to separate mixtures.
Name the separation technique used to:
separate sand from water
obtain salt crystals from salt solution
obtain pure water from ink
separate ethanol from a mixture of ethanol and water
A student has a mixture of sand and salt. The student adds water to the mixture, stirs it and then filters it. Give the reason why adding water allows the sand and salt to be separated.
Give the name of the substance left on the filter paper and the name used for the liquid that passes through the filter paper.
48 exam-style questions on Edexcel GCSE Chemistry 3.2 Methods of separating and purifying substances, covering 3.2.1 Pure substances and mixtures, 3.2.2 Techniques for separating mixtures, 3.2.3 Paper chromatography and Rf values, and 3.2.4 Making water potable. Each one has a worked solution and a mark scheme showing where the marks go.