9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22 x 10^2 kg and a volume of 2.69 x 10^-3 m³. Calculate the density, ρ, of the object. Use the equation ρ = m / V State the unit. (c) Aluminium has a melting point of 660 °C. The absolute zero of temperature is -273 °C. (i) Calculate the melting point of aluminium in kelvin. (ii) Describe the motion of particles in liquid aluminium (above 660 °C). Assess which of these materials may be the more suitable to use as thermal insulation in a building. Your answer should compare the properties of fibreglass and polystyrene given in the table.

GCSE Edexcel Physics Kinetic Theory: 9 (a) Which of these means chang

9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22 x 10^2 kg and a volume of 2.69 x 10^-3 m³ - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2

Question 9

9-(a)-Which-of-these-means-changing-state-from-solid-directly-to-gas?---A--condensing---B--freezing---C--melting---D--sublimating----(b)-An-object-has-a-mass-of-7.22-x-10^2-kg-and-a-volume-of-2.69-x-10^-3-m³-Edexcel-GCSE Physics-Question 9-2023-Paper 2.png

9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22... show full transcript

Worked Solution & Example Answer:9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22 x 10^2 kg and a volume of 2.69 x 10^-3 m³ - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2

Step 1

Which of these means changing state from solid directly to gas?

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Answer

The correct answer is D) sublimating. This describes a change of state from solid to gas.

Step 2

Calculate the density, ρ, of the object.

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Answer

To calculate the density, use the formula:

ρ = \frac{m}{V}

Substituting the values:

ρ = \frac{7.22 \times 10^2 \text{ kg}}{2.69 \times 10^{-3} \text{ m}^3}

This gives:
$ρ = 2680 \text{ kg/m}^3$ .

Step 3

State the unit.

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Answer

The unit of density is kg/m³.

Step 4

Calculate the melting point of aluminium in kelvin.

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Answer

To convert from Celsius to Kelvin, use the formula:

K = °C + 273

Therefore:

K = 660 + 273 = 933 ext{ K} $$.

Step 5

Describe the motion of particles in liquid aluminium (above 660 °C).

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Answer

In liquid aluminium, the particles move freely and randomly. They have various speeds and can slide over one another. The kinetic energy of the particles is higher than in the solid state, allowing them to move around more easily.

9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22 x 10^2 kg and a volume of 2.69 x 10^-3 m³ - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2

Worked Solution & Example Answer:9 (a) Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating (b) An object has a mass of 7.22 x 10^2 kg and a volume of 2.69 x 10^-3 m³ - Edexcel - GCSE Physics - Question 9 - 2023 - Paper 2

Which of these means changing state from solid directly to gas?

Calculate the density, ρ, of the object.

State the unit.

Calculate the melting point of aluminium in kelvin.

Describe the motion of particles in liquid aluminium (above 660 °C).

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