Solder is an alloy made by mixing measured masses of tin and lead.
Why is solder a formulation and not a pure substance?
It is a formulation because it contains two metals, and it is not pure because both of them are elements
It is a formulation because it melts over a range, and it is not pure because it is an alloy
It is a formulation because its components are mixed in measured amounts, and it is not pure because it contains two substances
It is a formulation because it is a useful product, and it is not pure because tin and lead are bonded together
40 exam-style questions on AQA GCSE Chemistry 8.1 Purity, formulations and chromatography, covering 8.1.1 Pure substances, 8.1.2 Formulations, and 8.1.3 Chromatography. Each one has a worked solution and a mark scheme showing where the marks go.