10 questions🇬🇧English
🎈 Ideal Gases & Kinetic Theory – A-level
Physics · A-level — heat capacity, latent heat, gas laws, pV = nRT and the kinetic theory of gases
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Questions
A gas is at a temperature of 27 °C. What is this temperature in kelvin?
27 K
300 K
246 K
327 K
20s
For a fixed mass of gas at constant temperature, Boyle's law states that the pressure of the gas is:
Independent of its volume
Directly proportional to its volume
Inversely proportional to its volume
Directly proportional to its temperature in °C
20s
What does the specific latent heat of a substance measure?
Energy to raise the temperature of 1 kg by 1 K
Energy to change the state of 1 kg at constant temperature
Energy to raise 1 kg of the substance to boiling point
Energy to change the state of 1 mol at 0 °C
20s
How much energy is needed to heat 2.0 kg of water by 10 K? The specific heat capacity of water is 4200 J kg⁻¹ K⁻¹.
840 000 J
84 000 J
42 000 J
8400 J
30s
How much energy is needed to melt 0.50 kg of ice at 0 °C? The specific latent heat of fusion of ice is 3.3 × 10⁵ J kg⁻¹.
6.6 × 10⁵ J
3.3 × 10⁵ J
1.65 × 10⁴ J
1.65 × 10⁵ J
30s
A gas occupies 2.0 L at 300 K. It is heated to 450 K at constant pressure. What is its new volume?
2.5 L
1.3 L
4.5 L
3.0 L
30s
Which of these is an assumption of the kinetic theory of an ideal gas?
Collisions between molecules are perfectly elastic
Molecules take up most of the container's volume
All molecules move at the same speed
Molecules attract each other strongly
30s
Approximately how many moles of gas are in 0.024 m³ at 100 kPa and 300 K? Take R = 8.31 J mol⁻¹ K⁻¹.
About 100 mol
About 0.1 mol
About 10 mol
About 1 mol
60s
The absolute temperature of an ideal gas is doubled from 300 K to 600 K. By what factor does the rms speed of its molecules change?
×√2
×4
×2
×2√2
30s
What is the mean kinetic energy of a gas molecule at 300 K? Take k = 1.38 × 10⁻²³ J K⁻¹.
2.1 × 10⁻²¹ J
4.1 × 10⁻²¹ J
1.2 × 10⁻²⁰ J
6.2 × 10⁻²¹ J
30s