Answers to AQA GCSE Density (Combined science)
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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Ernest Rutherford and the Nuclear Model
Niels Bohr changing the Nuclear Model
Discovering the Proton and Neutron
Measuring radiation from radioactivity
Radiation types and properties
Random nature of radioactive decay
Radioactive contamination or irradiation
Hazards of contamination and irradiation
Studies on the effects of radiation on humans