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Question 18M.2.HL.TZ1.c

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Date May 2018 Marks available [Maximum mark: 3] Reference code 18M.2.HL.TZ1.c
Level HL Paper 2 Time zone TZ1
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
18M.2.HL.TZ1.c

A closed box of fixed volume 0.15 m3 contains 3.0 mol of an ideal monatomic gas. The temperature of the gas is 290 K.

Explain, with reference to the kinetic model of an ideal gas, how an increase in temperature of the gas leads to an increase in pressure.

[3]

Markscheme

larger temperature implies larger (average) speed/larger (average) KE of molecules/particles/atoms

increased force/momentum transferred to walls (per collision) / more frequent collisions with walls

increased force leads to increased pressure because P = F/A (as area remains constant)

 

Ignore any mention of PV = nRT.

[3 marks]

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