Question 17N.3.SL.TZ0.01d
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.SL.TZ0.01d |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Explain | Question number | d | Adapted from | N/A |
To investigate the thermal properties of water, students placed hot water in two thin plastic cups and measured their rate of cooling. The sides of one cup were covered with tissue paper soaked in hot water; the other cup was left uncovered. The temperature was recorded with a thermometer every 4 minutes for 20 minutes. The temperature in the laboratory was 18 °C.
[Source: © International Baccalaureate Organization 2017]
[Source: © International Baccalaureate Organization 2017]
Explain, with reference to the thermal properties of water, how this experiment helps demonstrate how humans respond to overheating.
[3]
a. water has a high latent heat/high heat of vaporization
b. energy required to evaporate water «from the tissue paper»
c. evaporation of water leads to cooling
d. sweat produced by skin in response to heat
e. «evaporation of» sweat cools the body
Do not accept specific heat
[Max 3 Marks]
