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9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics - Question 9 - 2021 - Paper 1

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9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance. 1. 2. (b) Figure 20 shows the dimensions of a solid bl... show full transcript

Worked Solution & Example Answer:9. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance - Edexcel - GCSE Physics - Question 9 - 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 a solid, the particles are closely packed together, resulting in a definite shape, whereas in a liquid, the particles are less closely packed and can move freely, giving the liquid an indefinite shape.

  2. The particles in a solid vibrate in fixed positions due to strong intermolecular forces, while in a liquid, the particles can slide past one another because the intermolecular forces are weaker.

Step 2

Calculate the mass of the concrete block.

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Answer

To find the mass of the concrete block, we will first calculate its volume using the formula for volume:

V=extlengthimesextwidthimesextheightV = ext{length} imes ext{width} imes ext{height}

Here, the dimensions are:

  • Length = 1.5 m
  • Width = 1.0 m
  • Height = 0.20 m

Calculating the volume:

V=1.5imes1.0imes0.2=0.3extm3V = 1.5 imes 1.0 imes 0.2 = 0.3 ext{ m}^3

Now, using the density of concrete to find the mass:

ho imes V$$ Substituting in the values: $$m = 2100 ext{ kg/m}^3 imes 0.3 ext{ m}^3 = 630 ext{ kg}$$ Therefore, the mass of the concrete block is 630 kg.

Step 3

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

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Answer

  1. Use cladding or extra insulation on the walls to prevent heat from escaping.

  2. Double the thickness of the concrete used in the walls to create a more effective barrier against heat loss.

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 accurately, the student should follow these steps:

  1. Measure the length and width of each strip using the ruler to calculate the cross-sectional area.

  2. Weigh each strip using a precise scale to determine their mass.

  3. Calculate the volume of each strip by measuring their dimensions and using the formula for volume of rectangular solids: V=extlengthimesextwidthimesextheightV = ext{length} imes ext{width} imes ext{height}

  4. Finally, apply the density formula: ext{Density} = rac{ ext{Mass}}{ ext{Volume}} to find the density of each strip and confirm which metal corresponds to the known densities of aluminium and stainless steel.

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