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Density of Different Liquids

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Density of Different Liquids

Three liquids have been poured into a clear measuring cylinder. Use mass, volume and density to work out what is happening. Show calculations with units. Assume the liquids do not mix and form layers.

Work out the densities

Density describes how much mass is packed into a certain volume. Use density = mass ÷ volume.

1.A 50 mL sample of golden syrup has a mass of 70 g. Calculate its density in g/mL.
2.A 100 mL sample of water has a mass of 100 g. What is its density?
3.A 100 mL sample of cooking oil has a mass of 92 g. Work out its density. Is it more or less dense than water?

Solve the layering puzzle

Mere has a clear jar containing equal volumes of golden syrup, water and cooking oil. She pours them in carefully. Use your results to predict their positions.

4.Arrange golden syrup, water and cooking oil from the top layer to the bottom layer.
5.Explain why the golden syrup forms the bottom layer. Include the word density in your explanation.
6.Which statement best explains why the cooking oil floats on the water?
  • The oil has a lower density than water.
  • The oil has a greater mass than water in every sample.
  • The oil is always warmer than water.
  • The oil has no mass.
7.True or false? If two liquid samples have the same volume, the sample with the greater mass has the greater density.
TrueFalse

Test the idea

Think carefully about how density relates to mass and volume.

8.A small bottle holds 40 mL of a liquid with a mass of 48 g. Calculate the liquid’s density.
9.A student says, “A large sample must be denser than a small sample because it has more mass.” Explain what information is needed to compare their densities fairly.
10.A 60 mL liquid sample has a density of 0.8 g/mL. Calculate its mass. Include the correct unit.

2 printable pages

  • Density of Different Liquids, page 1 of 2: Work out the densities, Solve the layering puzzle

    Page 1

  • Density of Different Liquids, page 2 of 2: Test the idea

    Page 2

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