Question 21M.2.hl.TZ1.a
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.hl.TZ1.a |
| Level | hl | Paper | 2 | Time zone | TZ1 |
| Command term | Draw | Question number | a | Adapted from | N/A |
Hydrogen peroxide can react with methane and oxygen to form methanol. This reaction can occur below 50°C if a gold nanoparticle catalyst is used.
The diagram shows the Maxwell-Boltzmann curve for the uncatalyzed reaction.
Draw a distribution curve at a lower temperature (T2) and show on the diagram how the addition of a catalyst enables the reaction to take place more rapidly than at T1.
[2]
curve higher AND to left of T1 ✔
new/catalysed Ea marked AND to the left of Ea of curve T1 ✔
Do not penalize curve missing a label, not passing exactly through the origin, or crossing x-axis after Ea.
Do not award M1 if curve drawn shows significantly more/less molecules/greater/smaller area under curve than curve 1.
Accept Ea drawn to T1 instead of curve drawn as long as to left of marked Ea.