6. (a) Describe, in terms of particles, two differences between a solid and a liquid of the same substance. 1. 2. (b) Figure 13 shows the dimensions of a solid block of concrete. Density of concrete, ρ = 2100 kg/m³. Calculate the mass of the concrete block. Use the equation: m = ρ x V (c) Figure 14 shows a shed made mostly of concrete blocks. State two practical ways to reduce heat loss from this shed. 1. 2. (d) A student has two metal strips and a ruler, as shown in Figure 15. A teacher tells the student that • one metal strip is made of aluminium • the other metal strip is made of stainless steel. The student looks up data in a reference book, finding some density values: density of aluminium = 2710 kg/m³ density of stainless steel = 7850 kg/m³ The student has access to more of the same metal strips, if needed, and may ask for any extra measuring devices. 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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6. (a) 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

Question 6

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

Worked Solution & Example Answer:6. (a) 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

In a solid, particles are closely packed in a fixed arrangement, whereas in a liquid, they are more loosely packed and can move freely.
Particles in a solid vibrate around fixed positions, while particles in a liquid have more kinetic energy and can flow past one another.

Step 2

Calculate the mass of the concrete block.

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Answer

To find the mass of the concrete block, we first need to calculate its volume.

The formula for volume (V) of a rectangular block is:

$V = ext{length} imes ext{width} imes ext{height}$
Inserting the given dimensions:

$V = 1.5 ext{ m} imes 1.0 ext{ m} imes 0.20 ext{ m} = 0.3 ext{ m}^3$

Next, we can calculate the mass using the density equation:

ho imes V$$ Where: - Density (ρ) = 2100 kg/m³ - Volume (V) = 0.3 m³ Substituting these values: $$m = 2100 ext{ kg/m}^3 imes 0.3 ext{ m}^3 = 630 ext{ kg}$$

Step 3

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

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Answer

Use double glazed windows to provide better insulation.
Apply insulation cladding on the walls to create an additional layer of thermal resistance.

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

Measure the length and width of the metal strip using a ruler for accurate dimensions.
Measure the thickness of the strip with a calliper for precision.
Calculate the volume using the formula:

$V = ext{length} imes ext{width} imes ext{thickness}$ .
Determine the mass of the strip using an electronic balance.
Finally, use the density formula:

$ext{Density} = rac{ ext{mass}}{ ext{volume}}$ to find the density for both strips and compare it with the known values of aluminium and stainless steel.

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6. (a) 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

Worked Solution & Example Answer:6. (a) 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

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

Calculate the mass of the concrete block.

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

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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