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Measurement of Energy Results: Temp. Initial Final ml Substance Weight calories cal/gm Differenc Temp Temp Water e Peanut 1 0.3g 29°C 85°C 8 ml 2 0.3g 29°C 79°C 8 ml 0.3g 29°C 82°C 8 ml Peanut shell 1 0.3g 29°C 32°C 8 ml 2 0.3g 29°C 35°C 8 ml 0.3g 29°C 38°C 8 ml Corn grain 1 0.3g 29°C 45°C 8 ml 2 0.3g 29°C 48°C 8 ml 3 0.3g 29°C 50°C 8 ml

Measurement of Energy Results: Temp. Initial Final ml Substance Weight calories cal/gm Differenc Temp Temp Water e Peanut 1 0.3g 29°C 85°C 8 ml 2 0.3g 29°C 79°C 8 ml 0.3g 29°C 82°C 8 ml Peanut shell 1 0.3g 29°C 32°C 8 ml 2 0.3g 29°C 35°C 8 ml 0.3g 29°C 38°C 8 ml Corn grain 1 0.3g 29°C 45°C 8 ml 2 0.3g 29°C 48°C 8 ml 3 0.3g 29°C 50°C 8 ml

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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Animals get their energy from food in a chemical form which is bound in the molecules of carbohydrates, proteins and fats. Food energy is used to perform mechanical work, maintain body tissue, and for growth. Energy we get from food can be measured in terms of calorie or joules. Calorie is the amount of heat required to raise the temperature of 1 gram of water by 1 degree Celsius. 1 kilocalorie = 1,000 calories The amount of food energy is measured by completely burning the dried food in a calorimeter. A calorimeter contains an insulated vessel called the bomb. The bomb is in contact with known amount of water. The water jacket is insulated to prevent heat loss. The heat liberated by the combustion of a specific amount of food is absorbed by water. The amount of heat in food can be computed by getting the difference in the change of temperature. Q (lost by food) = Q (gained by water) Q (gained by water) = m c x T Where m = mass of water in grams; c = specific heat capacity of water ( 1 cal/g °C) and T = change in temperature (°C).
Transcribed Image Text:Animals get their energy from food in a chemical form which is bound in the molecules of carbohydrates, proteins and fats. Food energy is used to perform mechanical work, maintain body tissue, and for growth. Energy we get from food can be measured in terms of calorie or joules. Calorie is the amount of heat required to raise the temperature of 1 gram of water by 1 degree Celsius. 1 kilocalorie = 1,000 calories The amount of food energy is measured by completely burning the dried food in a calorimeter. A calorimeter contains an insulated vessel called the bomb. The bomb is in contact with known amount of water. The water jacket is insulated to prevent heat loss. The heat liberated by the combustion of a specific amount of food is absorbed by water. The amount of heat in food can be computed by getting the difference in the change of temperature. Q (lost by food) = Q (gained by water) Q (gained by water) = m c x T Where m = mass of water in grams; c = specific heat capacity of water ( 1 cal/g °C) and T = change in temperature (°C).
Activity No. 14 Measurement of Energy Results: Temp. Initial Final ml Substance Weight calories cal/gm Differenc Temp Temp Water e Peanut 1 0.3g 29°C 85°C 8 ml 2 0.3g 29°C 79°C 8 ml 3 0.3g 29°C 82°C 8 ml Peanut shell 0.3g 29°C 32°C 8 ml 2 0.3g 29°C 35°C 8 ml 0.3g 29°C 38°C 8 ml Corn grain 1 0.3g 29°C 45°C 8 ml 2 0.3g 29°C 48°C 8 ml 0.3g 29°C 50°C 8 ml
Transcribed Image Text:Activity No. 14 Measurement of Energy Results: Temp. Initial Final ml Substance Weight calories cal/gm Differenc Temp Temp Water e Peanut 1 0.3g 29°C 85°C 8 ml 2 0.3g 29°C 79°C 8 ml 3 0.3g 29°C 82°C 8 ml Peanut shell 0.3g 29°C 32°C 8 ml 2 0.3g 29°C 35°C 8 ml 0.3g 29°C 38°C 8 ml Corn grain 1 0.3g 29°C 45°C 8 ml 2 0.3g 29°C 48°C 8 ml 0.3g 29°C 50°C 8 ml
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