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6. 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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6. 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 c... show full transcript

Worked Solution & Example Answer:6. 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. In solids, particles are closely packed together, leading to a fixed shape, while in liquids, particles are further apart and can move freely, allowing liquids to take the shape of their container.

  2. The particles in a solid vibrate in fixed positions, whereas in a liquid, the particles can move past one another, resulting in greater fluidity.

Step 2

Calculate the mass of the concrete block.

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Answer

To calculate the volume (V) of the concrete block, we use the dimensions given:

Volume, V = length × width × height = 1.5 m × 1.0 m × 0.20 m = 0.3 m³.

Next, 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 double glazing for the windows to enhance insulation.

  2. Apply extra insulation or cladding to the walls to minimize heat transfer.

Step 4

Plan how the student could confirm the teacher's statements, by determining the density of each of the strips as accurately as possible.

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Answer

To determine the density of each metal strip:

  1. Measure the length and width of the strip using the ruler.
  2. Measure the thickness with a caliper for greater accuracy.
  3. Calculate the volume of the strip using the formula: Volume = length × width × thickness.
  4. Measure the mass of the strip using an electronic balance.
  5. Finally, compute the density using the formula: Density = mass/volume for each strip.

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