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Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating An object has a mass of 7.22 x 10²⁰ kg and a volume of 2.69 x 10⁵ m³ - Edexcel - GCSE Physics - Question 3 - 2023 - Paper 2

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Which-of-these-means-changing-state-from-solid-directly-to-gas?---A--condensing---B--freezing---C--melting---D--sublimating----An-object-has-a-mass-of-7.22-x-10²⁰-kg-and-a-volume-of-2.69-x-10⁵-m³-Edexcel-GCSE Physics-Question 3-2023-Paper 2.png

Which of these means changing state from solid directly to gas? A condensing B freezing C melting D sublimating An object has a mass of 7.22 x 10²⁰ kg... 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 An object has a mass of 7.22 x 10²⁰ kg and a volume of 2.69 x 10⁵ m³ - Edexcel - GCSE Physics - Question 3 - 2023 - Paper 2

Step 1

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

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Answer

The correct option is D: sublimating, as sublimation refers to the process where a substance changes from a solid state directly to a gas without passing through the liquid phase.

Step 2

Calculate the density, ρ, of the object.

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Answer

To calculate the density, we can use the formula:

ho=mV ho = \frac{m}{V}

Substituting the given values:

ρ=7.22×1020 kg2.69×105 m3\rho = \frac{7.22 \times 10^{20} \text{ kg}}{2.69 \times 10^{5} \text{ m}^3}

Evaluating this gives:

ρ≈2680 kg/m3\rho \approx 2680 \text{ kg/m}^3

Step 3

State the unit.

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Answer

The unit of density is kg/m³.

Step 4

Suggest two sentences that the student could have included to provide a more complete description of the correct procedure.

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Answer

  1. I ensured that the metal was fully submerged in the water, so it displaced the correct volume.
  2. I recorded the initial water level before adding the metal to accurately determine the volume displaced.

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