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2.2 Materials Materials

2.2 Materials Materials. Breithaupt pages 162 to 171. AQA AS Specification. 11. 1 Density. The density of a substance is defined as its mass per unit volume. Density ρ ( rho) = mass (kg) volume ( m 3 )

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2.2 Materials Materials

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  1. 2.2 MaterialsMaterials Breithaupt pages 162 to 171

  2. AQA AS Specification

  3. 11. 1 Density The density of a substance is defined as its mass per unit volume. Density ρ ( rho) = mass (kg) volume ( m3 ) The unit for density is the kilogram per cubic metre kg / m3 Note: 1 g cm-3 is the same as 1000 kg m-3

  4. Question Calculate the weight of a gold ingot of dimensions (20 x 10 x 4) cm volume of gold = 800 cm3[ 20x10 - 2 x 10x10 - 2 x 4x10 - 2 ] = 800 x10 - 6 m3 mass = volume x density = 800 x10 - 6 x 19 300 = 15.4 kg weight = 15.4 x 9.81 N weight of gold ingot = 152 N

  5. 11. 1 Density

  6. Density examples 7 900 10-25 to 10-15 0.0989 11 300 13 500 0.179 19 100 1.29 19 300 700 osmium 22 610 0.534 150 000 1000 1017 850to1400 2 700 > 4 x 1017

  7. Answers Complete: 6 g cm-3 1.5 m3 64 g 3 g cm-3

  8. 11. 1 Density Density ρ = mass (kg) volume ( m3) r = 0.05m h = 0.15m Density of Gold = 19.3 kg / m3 Volume of sphere = 4/3 π r3 If r = 2 cm calculate the mass of gold. Mass of Aluminium = 3.18 kg Volume of cylinder = π r2h Calculate the density of aluminium.

  9. 11. 1 Density Density ρ = mass (kg) volume ( m3) Hint: first work out the masses of each metal present

  10. Internet Links • Balloons & Bouyancy- PhET - Experiment with a helium balloon, a hot air balloon, or a rigid sphere filled with different gases. Discover what makes some balloons float and others sink. • Density Lab - Explore Science • Floating Log- Explore Science .

  11. Notes on Densityfrom Breithaupt pages 162 & 163 • Define what is meant by density, include the equation. • Calculate (a) the volume of copper that has a mass of 178 kg; (b) the mass of 14.4m3 of air; (c) the density of a solid of mass 2000kg and volume 3m3. • State the density of (a) a metallic solid; (b) water & (c) air • (a) Explain why a density of 1000 kgm-3 is the same as one of 1 g cm-3. (b) What is the density of water in g mm-3? • Explain how to measure the density of (a) a regular solid; (b) a liquid and (c) an irregular solid. • Try the Summary Questions on page 163

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