DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.13d
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.3.sl.TZ0.13d |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Outline | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 1]
17N.3.sl.TZ0.13d
Much of our energy needs are still provided by the refined products of crude oil.
(d)
Outline how water and carbon dioxide absorb infrared radiation.
[1]
Markscheme
bond length changes
OR
«asymmetric» stretching «of bonds»
OR
bond angle changes/bends
OR
polarity/dipole «moment» changes
OR
a dipole «moment» is created «when the molecule absorbs IR»
Accept “vibration of bonds” OR appropriate diagram
