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Thermochemistry & Food

Thermochemistry & Food. Food has a stored energy content that is measured in Calories 1 Calorie = 4.18 kJ. Thermochemistry & Food. 3 main sources: Proteins – 4 Cal/g Carbohydrate – 4 Cal/g Fat – 9 Cal/g. Thermochemistry & Food. Example:

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Thermochemistry & Food

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  1. Thermochemistry & Food • Food has a stored energy content that is measured in Calories • 1 Calorie = 4.18 kJ

  2. Thermochemistry & Food • 3 main sources: • Proteins – 4 Cal/g • Carbohydrate – 4 Cal/g • Fat – 9 Cal/g

  3. Thermochemistry & Food • Example: • How much chemical energy (kJ) is released from a single banana (70.0 Cal)? 70.0 Cal 4.18 kJ = 293 kJ 1 Cal

  4. Thermochemistry & Food • Interesting fact: The energy from a banana can be “burned” just by sitting for 58 minutes!

  5. Thermochemistry & Food • Example: • A cheeseburger is “burned” in a lab experiment that caused 10.0 L of water to increase in temperature 51.0 ºC. How many Calories was the cheeseburger?

  6. Thermochemistry & Food • Hint: 10.0 L of H2Ois 10,000 g of water! q = 2,130,000 J or 2130 kJ

  7. Thermochemistry & Food 2130 kJ 1 Cal = 510. Cal 4.18 kJ Interesting Fact: it would take 390 minutes to “burn” this amount of energy by sitting (6.5 hours!)

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