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

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Presentation transcript:

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: How much chemical energy (kJ) is released from a single banana (70.0 Cal)? 70.0 Cal 1 Cal 4.18 kJ = 293 kJ

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

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?

Thermochemistry & Food Hint: 10.0 L of H 2 O is 10,000 g of water! Hint: 10.0 L of H 2 O is 10,000 g of water! q = 2,130,000 J or 2130 kJ

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