12.4 - Energy in foods
Name________________
Question: Which substance has the most energy; crackers, popcorn, marshmallows, or
cereal? Why?
Hypothesis:
Procedure:
50 ml of water in flask
Data/ Calculations:
• Energy absorbed by water = energy in the food
• Energy of water = Cp x m x ΔT
• J = 4.18 j/gC x 50.0 grams x ΔT
Substance
Mass
before
Mass
after
Mass
change
Temp
change
J
kJ
kJ/g
Cereal
Marshmallow
Popcorn
Crackers
Conclusion:
1. Which substance has the most energy in them (kJ/g) ?
2. Why do foods burn?
3. Put substance in order of least energy to greatest.
4. Calculate the calories (1 Calorie = 4.18 kJ) in 50 grams of popcorn?
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