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Question 22M.2.SL.TZ2.b.ii

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Date May 2022 Marks available [Maximum mark: 2] Reference code 22M.2.SL.TZ2.b.ii
Level SL Paper 2 Time zone TZ2
Command term Discuss Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
22M.2.SL.TZ2.b.ii

A fixed mass of an ideal gas is contained in a cylinder closed with a frictionless piston. The volume of the gas is 2.5 × 10−3 m3 when the temperature of the gas is 37 °C and the pressure of the gas is 4.0 × 105 Pa.

Energy is now supplied to the gas and the piston moves to allow the gas to expand. The temperature is held constant.

Discuss, for this process, the changes that occur in the internal energy of the gas.

[2]

Markscheme

internal energy is constant ✓


internal energy depends on kinetic energy/temperature «only»

OR

since temperature/kinetic energy is constant ✓

 

Do not award MP2 for stating that “temperature is constant” unless linked to the correct conclusion, as that is mentioned in the stem.

Award MP2 for stating that kinetic energy remains constant.

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