The heat energy produced when the human body metabolises 1 gram of fat is__________?
Correct answer: C. 39 KJ
- A. 30 KJ
- B. 1 KJ
- C. 39 KJ
- D. 29 KJ
Explanation
Fat supplies approximately 39 kJ of energy per gram when metabolised, so 1 g fat releases about 39 kJ and option c is correct. This high value results from the oxidation of energy-rich carbon-hydrogen bonds. Students may choose 29 kJ because it is close to the energy value of protein or carbohydrate, which provide about 17 kJ/g rather than 39 kJ/g.
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About Exothermic and Endothermic Reactions
Exothermic reactions release heat to the surroundings and have negative enthalpy change, while endothermic reactions absorb heat and have positive enthalpy change. The topic uses energy profiles to identify reactants, products and activation energy, and includes bond energy, enthalpy diagrams, calorimetry and Hess's law for calculating overall heat changes.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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