Question 19M.3.sl.TZ2.12a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.sl.TZ2.12a |
| Level | sl | Paper | 3 | Time zone | TZ2 |
| Command term | State | Question number | a | Adapted from | N/A |
This question is about biofuel.
The structure of chlorophyll is given in section 35 of the data booklet.
State the feature of the chlorophyll molecule that enables it to absorb light in the visible spectrum.
[1]
large/extensive «electronic» conjugation
OR
«contains» many alternate single and double bonds
OR
extended system of alternating double and single bonds [✔]
Note: Student response must indicate a large or extended system to award mark.
This question was not well answered as many students missed the idea of the system being a large/extensive/extended or containing many alternating single and double bonds. Although fewer students than expected received a mark, examiners did note there were more student who wrote about conjugation or alternating single and double bonds (but were missing the idea of the system being large) which is an improvement from previous sessions.
