DP Chemistry (last assessment 2024)

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Question 17N.3.hl.TZ0.a

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Date November 2017 Marks available [Maximum mark: 1] Reference code 17N.3.hl.TZ0.a
Level hl Paper 3 Time zone TZ0
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
17N.3.hl.TZ0.a

The heme groups in cytochromes contain iron ions that are involved in the reduction of molecular oxygen.

State the half-equation for the reduction of molecular oxygen to water in acidic conditions.

[1]

Markscheme

O2 + 4H+ (aq) + 4e– → 2H2O (l)

Accept any balanced equation with any integer or fractional coefficients.

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