DP Chemistry (last assessment 2024)
Question 19M.3.hl.TZ2.9d(i)
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.hl.TZ2.9d(i) |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Suggest | Question number | d(i) | Adapted from | N/A |
d(i).
[Maximum mark: 2]
19M.3.hl.TZ2.9d(i)
Proteins have structural or enzyme functions.
Oil spills are a major environmental problem.
(d(i))
Suggest two reasons why oil decomposes faster at the surface of the ocean than at greater depth.
[2]
Markscheme
Any two of:
surface water is warmer «so faster reaction rate»/more light/energy from the sun [✔]
more oxygen «for aerobic bacteria/oxidation of oil» [✔]
greater surface area [✔]
Examiners report
Many candidates received two marks for this part while some candidates only suggested one reason or repeated the same reason (for example - heat and energy from the sun) even though the question clearly asked for two reasons.
