Density
3 marks · NormalA school laboratory has a large block of wax. A student is asked to determine the density of the wax.
She records the mass as 1.20 kg. She measures the block’s dimensions as 20.0 cm × 10.0 cm × 5.00 cm. Calculate the volume in m³.
Calculate the density of the wax block in kg/m³.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) 0.00100 m³
(b) 1200 kg/m³
Common mistakes: Not converting cm³ to m³; Forgetting units
Show mark scheme and worked solution
Marking points
A1 (a) · 1 mark · Correctly calculates the volume in m³.
M1 (b) · 1 mark · Correct substitution into using SI units. (follow-through)
A2 (b) · 1 mark · Correct final density in kg/m³. (follow-through)
Worked solution
(a) Volume = 20.0 × 10.0 × 5.00 = 1000 cm³ = 1000 × 10⁻⁶ = 0.00100 m³
(b) Density = mass / volume = 1.20 kg / 0.00100 m³ = 1200 kg/m³