Which sample is a pure substance in the chemical sense?
[1]
A
Sea water that contains several dissolved salts
B
Air that contains nitrogen, oxygen and argon
C
Copper wire that contains only copper atoms
D
Steel that contains iron atoms and carbon atoms
Markscheme
8.1 Purity, formulations and chromatography Questions
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.