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Properties of Solids

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Properties of Solids

Use the evidence in each task to investigate how solids behave. Show calculations with units, and explain what the evidence supports. Density = mass ÷ volume. Assume measurements are reliable unless a question asks you to evaluate them.

What makes a solid?

A community workshop is choosing materials for a small footbridge and a protective case. You are the science adviser. Use particle ideas and measured properties to make defensible recommendations.

1.A metal cube keeps its shape when moved from a bench into a box. Explain this behaviour using the arrangement and motion of particles in a solid.
2.A solid steel ball is pressed hard in a vice but does not visibly change shape. Which statement best explains why?
  • Its particles are far apart and move freely.
  • Its particles are closely packed and strongly resist being pushed into new positions.
  • Its particles have no motion at all.
  • Its particles spread out to fill the vice.
3.A block of wax is warmed and expands slightly, but it remains solid. Describe what happens to its particles and why the block can still keep its overall shape.

Density evidence

The workshop tests four solid samples. Each sample is a regular block. Use the measurements below; density is measured in g/cm³.

Sample A: mass 54 g; volume 20 cm³. Material: aluminium.

Sample B: mass 78 g; volume 10 cm³. Material: steel.

Sample C: mass 18 g; volume 20 cm³. Material: pine wood.

Sample D: mass 40 g; volume 20 cm³. Material: acrylic.

4.Calculate the density of Samples A and B. Include the equation, substitution and correct units.
5.Order Samples A, B, C and D from lowest to highest density. Show the density for each sample to support your order.
6.Two blocks have the same volume, 20 cm³. One is pine (18 g) and one is acrylic (40 g). Explain what the difference in their masses tells you about their densities.
7.A sample has a mass of 96 g and a density of 8.0 g/cm³. Calculate its volume and show your working.

Choose and evaluate materials

The footbridge needs a strong, dense material for a compact support. The protective case should be light enough to carry. Density alone does not measure strength, so avoid claiming more than the evidence allows.

8.Which tested sample is the best density-based choice for a compact bridge support? Give its density and explain one limitation of your recommendation.
9.Which sample would be the lightest choice for a case of a fixed volume of 100 cm³? Calculate its expected mass using the sample data.
10.A student says, “A larger solid object must have a greater density than a smaller one.” Is this correct? Use density ideas to correct the claim.
11.A metal block has mass 120 g. Water in a measuring cylinder rises from 50 mL to 65 mL when the block is fully submerged. Calculate the block’s volume and density. State one assumption in this method.

3 printable pages

  • Properties of Solids, page 1 of 3: What makes a solid?

    Page 1

  • Properties of Solids, page 2 of 3: Density evidence

    Page 2

  • Properties of Solids, page 3 of 3: Choose and evaluate materials

    Page 3

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