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Question 19N.2.HL.TZ0.b(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.b(ii)
Level HL Paper 2 Time zone TZ0
Command term Explain Question number b(ii) Adapted from N/A
b(ii).
[Maximum mark: 2]
19N.2.HL.TZ0.b(ii)

explain why the entropy of the gas decreases.

[2]

Markscheme

ALTERNATIVE 1

«from b(i)» Q is negative 

S=QT AND S is negative 

 

ALTERNATIVE 2

T and/or V decreases ✔

less disorder/more order «so S decreases» ✔

 

ALTERNATIVE 3

T decreases ✔

S=K×lnT2T1<0 ✔

 

NOTE: Answer given, look for a valid reason that S decreases.