Question 19N.3.SL.TZ0.16b
| Date | November 2019 | Marks available | [Maximum mark: 3] | Reference code | 19N.3.SL.TZ0.16b |
| Level | SL | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | b | Adapted from | N/A |
Three groups of human volunteers were given different amounts of almond nuts added to a controlled diet for a period of 68 days. During that period the amount of energy released in their feces was measured.
[Source: Janet A Novotny, Sarah K Gebauer, David J Baer, Discrepancy between the Atwater factor predicted and
empirically measured energy values of almonds in human diets, The American Journal of Clinical Nutrition,
Volume 96, Issue 2, August 2012, Pages 296–301, https://doi.org/10.3945/ajcn.112.035782]
Describe how the energy content of food may be measured by combustion.
[3]
a. A calorimeter/calorimetry is used ✔
b. food is burned/heated/combusted to release energy/heat ✔
c. the energy/heat is used to heat up water ✔
d. the rise in temperature of the water allows the energy in the food to be calculated ✔
e. energy from the food = specific heat capacity of water x mass of water x temperature rise ✔ Accept alternative correct formula
