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Learning Targets“I Can…”
-Observe how food supplies energy for all animals the form of carbohydrates, lipids, and proteins.
-Determine and compare the energy content of different foods by calorimetry.
Energy in Food
Why do we eat?
• To live!
• We need the energy from food to run, talk, and think
How much food do we need?
• An average person should eat about 2000 kilocalories a day (2000 Calories as noted on food labels)
• This is equivalent to 8360 kilojoules, the metric unit of energy
What you will do
• Use a thermometer to measure temperature changes.
• Monitor the energy given off by food as it burns.
• Determine and compare the energy content of different foods.
Make A Hypothesis
• Which has the most energy (Calories)?– Marshmallow– Popcorn– Nut
Results
Table 3
Calculations Sample 1 Sample 2
Mass of water (g)
t of water (°C)
mass of food (g)
Energy gained by water (J)
Energy content of food (J/g)
Results
Table 4
Calculation Sample 1 Sample 2
mass
t
Energy gained
Energy content
ResultsTable 4
Class results
Food type Food type Food type Food type
Energy content (kJ/g)
Avg:
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