Caloric Content of Food Lab

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Lab 7 “Caloric Content of Food” Quiara Scrima no partner location: my home Chem 101 4/11/15 Abstract: The purpose of this lab was to measure the energy content in various foods through burning them and capturing the heat released to a known mass of water in a calorimeter. Calories and Joules were units utilized to measure the heat captured. The results of this experiment showed that the peanut had the most energy per gram (1.8 kcal), then the chip (1.7 kcal), then the marshmallow (0.82 kcal). Hypothesis/ purpose: the purpose of the lab is to familiarize ourselves with the calorie and joule through measuring the various amounts of heat released burning foods, to measure the energy contained in the food items. My hypothesis is that the peanut will be the most energy dense food, as it is the most rich in fats (9 calories per gram) , whereas carbohydrates and proteins only have 4 calories per gram. Procedures: materials: lighter aluminium foil metal fork marshmallows peanuts potato chips water 100 mL beaker burner stand safety goggles scale 500 g test tube clamp holder thermometer Methods: 1. Weigh 100 mL beaker 2. half fill beaker with water - 50 mL, re-weigh. 3. Calculate net weight of water used & record temperature. 4. Place burner on top of aluminum foil and add beaker of water on top of burner stand. 5. Marshmallow: weigh the mass of the marshmallow and the mass of fork. Then place marshmallow on fork & light it with lighter. a. When marshmallow is burning, hold under the water beaker and stir the water with thermometer. b. Once marshmallow completely burnt, weigh the fork + marshmallow, then calculate new net weight of marshmallow . c.. record final temperature of water, then dump out water and refill beaker as before. 6. Peanut: weigh the mass of the peanut. a. light peanut, holding it with long skewer. Hold under the beaker as before and stir with thermometer.

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