You have been asked to experimentally determine the Calorie (1 Calorie = 1000 ca
ID: 1070284 • Letter: Y
Question
You have been asked to experimentally determine the Calorie (1 Calorie = 1000 calories) values of various desserts. You realize that a combustion reaction is analogous to the digestive reaction occurring during metabolism and the amount of energy released from combustion will tell us how much nutritional energy we can expect from the food. You then need to apply the principles of calorimetry to measure the energy released by the desserts upon combustion. After some research, you discover that calorimetry of combustion reactions is performed in an instrument called a bomb calorimeter, which is shown below. The name “bomb” refers to the inner chamber of the calorimeter that can withstand great increases in pressure.
4. Stainless steel is not a good insulator, but is instead a good conductor. Why is the bomb made of this type of material? Fill in the blanks using words from the table below.
The heat from the reaction cannot be measured within the______ . The heat is instead measured using the temperature of the_______ , and an insulator would not allow for______ .
6. After combusting cotton candy in a bomb calorimeter, you look into the inner chamber and notice that the cotton candy seems to be completely gone. Where did it go?
The products are _________ ["gases", "liquids", "solids", "aqueous"] , so they__________ ["are vapors", "flowed out through the porous container", _____________"plated to the inside of the container"] and are not visible.
bomb condensation electrodes expansion heat transfer reaction sample cup waterExplanation / Answer
4. Stainless steel is not a good insulator, but is instead a good conductor. Why is the bomb made of this type of material? Fill in the blanks using words from the table below.
The heat from the reaction cannot be measured within the bomb. The heat is instead measured using the temperature of the water, and an insulator would not allow for heat transfer.
6. After combusting cotton candy in a bomb calorimeter, you look into the inner chamber and notice that the cotton candy seems to be completely gone. Where did it go?
The products are gases, so they are vapors and are not visible.
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