| Date | May 2016 | Marks available | 1 | Reference code | 16M.1.HL.TZ0.2 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Identify | Question number | 2 | Adapted from | N/A |
Question
Why is sweat a good coolant for the body?
A. The arterioles that transfer water to sweat move closer to the skin surface when it is hot.
B. Breaking H bonds between water molecules in sweat requires energy from body heat.
C. Sweat contains minerals such as sodium chloride.
D. Sweat is non-polar.
Markscheme
B
Examiners report
This question was a good discriminator; good candidates had the right answer while weaker candidates did not realize that it is the breaking of the H bonds between water molecules that makes it a good coolant.
