DP Chemistry (last assessment 2024)

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Question 18M.2.sl.TZ2.5a

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.sl.TZ2.5a
Level sl Paper 2 Time zone TZ2
Command term Distinguish Question number a Adapted from N/A
a.
[Maximum mark: 1]
18M.2.sl.TZ2.5a

A mixture of 1.00 mol SO2(g), 2.00 mol O2(g) and 1.00 mol SO3(g) is placed in a 1.00 dm3 container and allowed to reach equilibrium.

2SO2(g) + O2(g) ⇌  2SO3(g)

(a)

Distinguish between the terms reaction quotient, Q, and equilibrium constant, Kc.

[1]

Markscheme

Q: non-equilibrium concentrations AND Kc: equilibrium concentrations

OR

Q: «measured» at any time AND Kc: «measured» at equilibrium

[1 mark]

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