DP Chemistry (last assessment 2024)
Question 17N.3.hl.TZ0.14a
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.3.hl.TZ0.14a |
| Level | hl | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
17N.3.hl.TZ0.14a
The heme groups in cytochromes contain iron ions that are involved in the reduction of molecular oxygen.
(a)
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.
