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 block of concrete. Density of concrete, ρ = 2100 kg/m³. Calculate the mass of the concrete block. Use the equation: m = ρ × V mass of concrete block = ______________________ kg (c) 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 22. 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 = 2710kg/m³ density of stainless steel = 7850kg/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. Total for Question 9 = 13 marks.

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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

Question 9

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

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.
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:

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

Here, the dimensions are:

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

Calculating the volume:

$V = 1.5 imes 1.0 imes 0.2 = 0.3 ext{ m}^3$

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

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

Measure the length and width of each strip using the ruler to calculate the cross-sectional area.
Weigh each strip using a precise scale to determine their mass.
Calculate the volume of each strip by measuring their dimensions and using the formula for volume of rectangular solids: $V = ext{length} imes ext{width} imes ext{height}$
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.

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

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

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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