DP Chemistry (last assessment 2024)
Question 23M.3.SL.TZ1.10
| Date | May 2023 | Marks available | [Maximum mark: 4] | Reference code | 23M.3.SL.TZ1.10 |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Deduce, Outline, Write | Question number | 10 | Adapted from | N/A |
10.
[Maximum mark: 4]
23M.3.SL.TZ1.10
Biofuels can be synthesized or converted to make them more usable.
(a)
Write the equation for the fermentation of glucose, C6H12O6, to produce ethanol.
[1]
Markscheme
C6H12O6 → 2C2H5OH + 2CO2 ✓
(b)
Deduce the equation for the reaction of the triglyceride shown with methanol.
[2]
Markscheme
ester product ✓
glycerol AND correct balancing ✓
(c)
Outline the essential feature needed for a molecule to convert light energy into chemical energy.
[1]
Markscheme
conjugated bonds/alternating C=C bonds/delocalized electrons/bonding ✓
Accept ‘alternating single and double bonds’.
Do not accept ‘many double bonds’.