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Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics Combined Science - Question 6 - 2021 - Paper 1

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Describe, in terms of particles, two differences between a solid and a liquid of the same substance. 1. 2. Figure 13 shows the dimensions of a solid block of conc... show full transcript

Worked Solution & Example Answer:Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics Combined Science - Question 6 - 2021 - Paper 1

Step 1

Describe, in terms of particles, two differences between a solid and a liquid of the same substance.

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Answer

  1. Particles in a solid are closely packed together, whereas particles in a liquid are not as tightly packed and have more space between them.

  2. In a solid, particles vibrate in fixed positions, while in a liquid, particles can move freely past one another.

Step 2

Calculate the mass of the concrete block.

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Answer

To calculate the mass, we first find the volume using the dimensions from Figure 13:

Volume (V) = length × width × height = 1.5 m × 1.0 m × 0.2 m = 0.3 m³.

Now, we can use the formula for mass: m = ρ × V = 2100 kg/m³ × 0.3 m³ = 630 kg.

Step 3

State two practical ways to reduce heat loss from this shed.

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Answer

  1. Use additional insulation around the walls of the shed to minimize heat transfer.

  2. Install double-glazed windows to reduce heat loss through the glass.

Step 4

Plan how the student could confirm the teacher's statements.

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Answer

  1. Measure the length and width of one of the metal strips using the ruler.

  2. Measure the thickness with a caliper for greater accuracy.

  3. Record the measurements and calculate the volume of the strip using the formula: Volume (V) = length × width × thickness.

  4. Weigh the strip using an electronic balance to determine its mass.

  5. Use the density formula: Density (ρ) = mass (m) / volume (V) to find the density and compare it to the known densities of aluminium and stainless steel.

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