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 x 10^2 kg and a volume of 2.69 x 10^3 m^3. 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.

GCSE Edexcel Physics Combined Science Density ρ: 6. (a) Which of these means chan

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 x 10^2 kg and a volume of 2.69 x 10^3 m^3 - 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-x-10^2-kg-and-a-volume-of-2.69-x-10^3-m^3-Edexcel-GCSE Physics Combined Science-Question 6-2023-Paper 2.png

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... 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 x 10^2 kg and a volume of 2.69 x 10^3 m^3 - 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. Sublimation is the process where a solid changes directly into a gas without passing through a 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 = \frac{m}{V}

Substituting the values:

Mass, m = 7.22 × 10^2 kg
Volume, V = 2.69 × 10^3 m³

Calculating:

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

Step 3

State the unit.

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Answer

The unit for density is kg/m³.

Step 4

Calculate the melting point of aluminium in kelvin.

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Answer

To convert the melting point of aluminium from Celsius to Kelvin, use the formula:

K = °C + 273.15

Using the given melting point:

Melting point in Celsius = 660 °C

Calculating:

K = 660 + 273.15 = 933.15 K

Thus, the melting point of aluminium in kelvin is approximately 933.15 K.

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 x 10^2 kg and a volume of 2.69 x 10^3 m^3 - Edexcel - GCSE Physics Combined Science - Question 6 - 2023 - Paper 2

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 x 10^2 kg and a volume of 2.69 x 10^3 m^3 - Edexcel - GCSE Physics Combined Science - Question 6 - 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.

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