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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 × 10² kg and a volume of 2.69 × 10⁻⁵ m³ - Edexcel - GCSE Physics: Combined Science - Question 2 - 2023 - Paper 2

Question 2

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 × 10² kg and a... show full transcript

Worked Solution & Example Answer: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 × 10² kg and a volume of 2.69 × 10⁻⁵ m³ - Edexcel - GCSE Physics: Combined Science - Question 2 - 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. Sublimation is the process where a solid changes directly into a gas without going through a liquid state.

Step 2

Calculate the density, ρ, of the object.

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Answer

To calculate the density, we use the formula:

ρ = \frac{m}{V}

Substituting the values from the question:

ρ = \frac{7.22 \times 10^{2} \text{ kg}}{2.69 \times 10^{-5} \text{ m}^{3}}\

Now performing the calculation:

ρ ≈ 2680 \text{ kg/m}^{3}

Therefore, the density is approximately 2680 kg/m³.

The unit for density is kg/m³.

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