Multiple Choice
Passage
A student performed an experiment to determine the energy content of a sample of potato chips. The chips were blended and then freeze-dried to remove moisture from the sample. Freeze-drying, or lyophilisation, is the preferred dehydration process for food calorimetry due to its minimal impact on nutritional content. Lyophilisation removes water from frozen food samples at low pressure through sublimation. The water is later collected in a cooled condensation chamber to prevent damage to any electric components.After freeze-drying, the sample was ground into a dry homogenous powder. A 1-g sample of the powder was placed in a bomb cell, an enclosed steel-walled container, and pressurized to 25 atm with pure oxygen to ensure complete combustion. The bomb cell was submerged in 500 g of water at room temperature (25°C) in an enclosed and thermally insulated calorimetry device. The sample was combusted using an electric fuse. The temperature of the surrounding water was measured with a glass thermometer every 30 s for several minutes (Figure 1) .
Figure 1 Temperature of the water in the bomb calorimeterThe energy content of food is given in units of dietary calories (Cal) , which is equal to 4.185 kJ, or 1,000 gram calories (cal) . A gram calorie is the amount of energy required to increase 1 g of water by 1°C.
Adapted from Jumpertz R, Venti CA, Le DS, et al., Food label accuracy of common snack foods. Obesity 2013 Wiley-Blackwell.
-If the student repeated the experiment by replacing the water in the calorimetry device with an ice bath at 0°C, how would the experimental results differ?
A) The temperature of the water would increase to 10°C.
B) The temperature of the water would begin to increase at a later time.
C) The heat released when ice melts increases the measured temperature.
D) The amount of heat released from the combustion reaction would increase.
Correct Answer:

Verified
Correct Answer:
Verified
Q162: Passage<br>Osteoporosis is a degenerative bone condition in
Q163: <img src="https://d2lvgg3v3hfg70.cloudfront.net/MD0008/.jpg" alt=" A 4-μF capacitor
Q164: Which of the following procedures best describes
Q165: Passage<br>Hydrostatic weighing is a technique used to
Q166: The relationship between the length of a
Q168: <img src="https://d2lvgg3v3hfg70.cloudfront.net/MD0008/.jpg" alt=" Four charged particles
Q169: Passage<br>In the event of end-stage heart failure,
Q170: Which of the following color transitions best
Q171: Passage<br>A student performed an experiment to determine
Q172: Passage<br>A student performed an experiment to determine