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: