DP Chemistry (last assessment 2024)

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Question 17N.2.sl.TZ0.a

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.2.sl.TZ0.a
Level sl Paper 2 Time zone TZ0
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
17N.2.sl.TZ0.a

Many reactions are in a state of equilibrium.

The following reaction was allowed to reach equilibrium at 761 K.

H2 (g) + I2 (g) ⇌ 2HI (g)               ΔHθ < 0

Outline the effect, if any, of each of the following changes on the position of equilibrium, giving a reason in each case.

[2]

Markscheme

Award [1 max] if both effects are correct.

Reason for increasing volume:

Accept “concentration of all reagents reduced by an equal amount so cancels out in Kc expression”.

Accept “affects both forward and backward rates equally”.

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