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Thermal Physics

Quick questions on Kinetic theory and ideal gases explained: H2 Physics Thermal Physics

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is assumptions of the kinetic model?
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An ideal gas is modelled as a large number of identical molecules for which:
What is pressure from molecular motion?
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Deriving the pressure from molecular collisions with the walls gives:
What is q1?
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State four assumptions of the kinetic theory of an ideal gas. [2 marks]
What is q2?
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A gas has pressure 2.0×105 Pa2.0 \times 10^5\ \text{Pa} and volume 1.5×103 m31.5 \times 10^{-3}\ \text{m}^3 at 310 K310\ \text{K}. Find the number of moles (R=8.31R = 8.31). [2 marks]
What is q3?
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Explain why, at the same temperature, helium atoms move faster on average than nitrogen molecules. [2 marks]

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