FS HN 167 Study Guide - Final Guide: High High, Chromosome, Cholecystokinin
4 Dec 2018
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Briefly describe how it works: calorimeter measures the amount of heat lost or gained, bomb calorimeter measures the amount of heat released after combustion or burning. The substance you are trying to measure is placed in a bomb (high pressure container with wires adding gases and chemicals to ignite the burning process) submerged in water in a larger container. The change in internal energy is measured and then converted to kcals for food labels and food labs. Why are these values typically lower than values derived from a bomb calorimeter: carbohydrate- 4 kcals/gram, protein- 4 kcal/gram, fat-9 kcal/gram, alcohol- 7 kcal/gram, the bomb calorimeter measures in internal energy which is carbohydrate- 16. 7kj/gram, fat- 37. 7kj/gram, protein- 16. 7kj/gram: the heat of combustion in a bomb calorimeter for protein is 5. 6 kcal/g, yet on a food label it tells me that protein has 4 kcal/g.
