DP Chemistry (last assessment 2024)
Question 17N.3.sl.TZ0.3a
| Date | November 2017 | Marks available | [Maximum mark: 1] | Reference code | 17N.3.sl.TZ0.3a |
| Level | sl | Paper | 3 | Time zone | TZ0 |
| Command term | Estimate | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
17N.3.sl.TZ0.3a
Sodium chloride, NaCl, can be spread on icy roads to lower the freezing point of water.
The diagram shows the effects of temperature and percentage by mass of NaCl on the composition of a mixture of NaCl and H2O.
(a)
Estimate the lowest freezing point of water that can be reached by adding sodium chloride.
[1]
Markscheme
–21 «ºC»
