1. Chapter 2 Energy and Matter
2.2
Energy and Nutrition

2. Calorimeters A calorimeter is used to measure heat transfer.
can be made with a coffee cup and a thermometer.
indicates the heat lost by a sample
indicates the heat gained by water.

3. Energy and Nutrition
On food labels, energy is shown as the nutritional
Calorie, written with a capital C. In countries other
than the U.S., energy is shown in kilojoules (kJ).
1 Cal = calories
1 Cal = kcal
1 Cal = cal
1 Cal = J
1 Cal = kJ

4. Caloric Food Values Carbohydrate: 4 kcal 1 g Fat (lipid): 9 kcal
The caloric or energy values for foods indicate the
number of kcal(Cal) provided by 1 g of each type of food.
Carbohydrate: 4 kcal
1 g
Fat (lipid): 9 kcal
Protein: 4 kcal

5. Energy Values for Some Foods
TABLE 2.2

6. Energy Requirements
The amount of energy needed each day depends on age, sex, and physical activity.
TABLE 2.3

7. Learning Check
A cup of whole milk contains 12 g of carbohydrate, 9.0 g of fat, and 5.0 g of protein. How many kcal (Cal) does a cup of milk contain?
1) 48 kcal (or Cal)
2) 81 kcal (or Cal)
3) 150 kcal (or Cal)

8. Solution 3) 150 kcal (or Cal)
A cup of whole milk contains 12 g of carbohydrate, 9.0 g of fat, and 5.0 g of protein. How many kcal (Cal) does a cup of milk contain?
3) 150 kcal (or Cal)
12 g carbohydrates x 4 kcal/g = 50 kcal (1 SF)
9.0 g fat x 9 kcal/g = 80 kcal (1 SF)
5.0 g protein x 4 kcal/g = 20 kcal (1 SF)
150 kcal