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Which of these means changing state from solid directly to gas? A B C D (b) An object has a mass of 7.22 × 10^−2 kg and a volume of 2.69 × 10^−5 m^3 - Edexcel - GCSE Physics Combined Science - Question 2 - 2023 - Paper 2

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Which of these means changing state from solid directly to gas? A B C D (b) An object has a mass of 7.22 × 10^−2 kg and a volume of 2.69 × 10^−5 m^3. Calculate the ... show full transcript

Worked Solution & Example Answer:Which of these means changing state from solid directly to gas? A B C D (b) An object has a mass of 7.22 × 10^−2 kg and a volume of 2.69 × 10^−5 m^3 - 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 substance changes directly from a solid to a gas without passing through the liquid state.

Step 2

Calculate the density, ρ, of the object.

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Answer

To calculate the density, we will use the formula:

ρ=mVρ = \frac{m}{V}

Where:

  • m = mass = 7.22 × 10^−2 kg
  • V = volume = 2.69 × 10^−5 m^3

Substituting the values:

ρ=7.22×10−2 kg2.69×10−5 m3ρ = \frac{7.22 \times 10^{-2} \text{ kg}}{2.69 \times 10^{-5} \text{ m}^3}

Calculating this gives:

ρ≈2680 kg/m3ρ ≈ 2680 \text{ kg/m}^3

Step 3

State the unit.

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Answer

The unit for density is kg/m³.

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