6 (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 × 10² kg and a volume of 2.69 × 10³ m³. Calculate the density, ρ, of the object. Use the equation ρ = m / V State the unit. density = _______________ 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. melting point of aluminium = _______________________ K

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6 (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 × 10² kg and a volume of 2.69 × 10³ m³ - Edexcel - GCSE Physics: Combined Science - Question 6 - 2023 - Paper 2

Question 6

6 (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 × 10² kg and... show full transcript

Worked Solution & Example Answer:6 (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 × 10² kg and a volume of 2.69 × 10³ m³ - Edexcel - GCSE Physics: Combined Science - Question 6 - 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 is because sublimation refers to the process where a solid changes directly into 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 use the formula:

\rho = \frac{m}{V}

Here, the mass (m) is given as 7.22 × 10² kg and the volume (V) as 2.69 × 10³ m³. Plugging in the values, we have:

\rho = \frac{7.22 \times 10^{2} \text{ kg}}{2.69 \times 10^{3} \text{ m}^{3}} \approx 0.268 \text{ kg/m}^3

Thus, the density of the object is approximately 0.268 kg/m³.

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 the melting point from Celsius to Kelvin, we use the formula:

K = °C + 273.15

For aluminium, the melting point is 660°C. Thus,

K = 660 + 273.15 = 933.15 ext{ K}

So the melting point of aluminium in Kelvin is approximately 933.15 K.

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