Answers to AQA GCSE Density
Practice Questions
1.A small gemstone has a mass of 60g and a volume of 1.5 x 10-2 m3. Calculate the density in kg/m3
Density = mass/volume
60g = 0.06kg
Density = 0.06/1.5 x 10-2
Density = 4 kg/m3
2.Calculate the mass of a sphere which has a volume of 9 x 10-2 m3 and density of 3.2 x 10-3 kg/m3.
Density = mass/volume
Mass = Density x volume
Mass = 3.2 x 10-3 x 9 x 10-2
Mass = 2.9 x 10-4kg
3. Use the image below of a roll of plastic film to help you to answer the following question.
The film has a density of 3000 kg/m3 and mass of 20kg. If the film is uncoiled and laid flat it has a length of 3m x 1m. Calculate the thickness of the film.
Density = mass/volume
Volume = mass/density
Volume = 20/3000 = 6.67 x 10-3 m3
When the object is laid flat and uncoiled it will exist as a cuboid
Volume = length x width x thickness
6.67 x 10-3 m3 = 3m x 1m x thickness
Thickness = 6.67 x 10-3/(3 x 1)
Thickness = 2.22 x 10-3m
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