Questions
Exam-style questions on your own readings, marked point by point
Questions follow the conventions of the real papers: the context first, a figure or table labelled above, the marks in brackets, a labelled answer line. They are written for Study Hack, and the numbers come from a run, yours once you have done the practical.
03.1 You plotted the mass of the sugar solution (y-axis) against its volume (x-axis). Your line of best fit passes through the origin and the point where the volume is 80 cm³ and the mass is 86.9 g.
Figure 1
Calculate the density of the sugar solution.[2 marks]
- ρ = gradient = 86.9 ÷ 80
- ρ = 1.09 g/cm³
Density = 1.09 g/cm³
- M1ρ = 86.9 ÷ 80 (the gradient), mark awarded
- A1ρ = 1.09 g/cm³, mark awarded
2 marks out of 2
The classic slip, and what the scheme’s note says
ρ = 80 ÷ 86.9 = 0.92 g/cm³0 marks out of 2
Mass ÷ volume, not volume ÷ mass: 86.9 ÷ 80 = 1.09 g/cm³.


