A recycling plant tests a sample of recovered solvent V.
Pure solvent V has a boiling point of 98 ∘C98\ ^\circ\text{C}98 ∘C. The sample began to boil at 92 ∘C92\ ^\circ\text{C}92 ∘C and finished boiling at 98 ∘C98\ ^\circ\text{C}98 ∘C.
A technician concludes that the sample is not pure.
Which comment correctly evaluates the technician's conclusion?
The technician's conclusion is not supported because a pure liquid should boil over a range containing the accepted temperature.
The technician's conclusion is supported because the sample finished boiling at exactly the accepted boiling point of solvent V.
The technician's conclusion is supported because the sample boils over a range of temperatures.
The technician's conclusion is not supported because reaching the accepted temperature shows that the sample is pure.
113 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.