Food Labels, Calories, and Joules Name ______

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```					Food Labels, Calories, and Joules                             Name ____________

From “How Stuff Works”

What is a Calorie?

A calorie is a unit of energy. We tend to associate calories with food, but they apply to
anything containing energy. For example, a gallon (about 4 liters) of gasoline contains about
31,000,000 calories.
Specifically, a calorie is the amount of energy, or heat, it takes to raise the temperature of 1
gram of water 1 degree Celsius (1.8 degrees Fahrenheit). One calorie is equal to 4.184
joules, a common unit of energy used in the physical sciences.
Most of us think of calories in relation to food, as in "This can of soda has 200 calories." It
turns out that the calories on a food package are actually kilocalories (1,000 calories = 1
kilocalorie). The word is sometimes capitalized to show the difference, but usually not. A food
calorie contains 4,184 joules. A can of soda containing 200 food calories contains 200,000
regular calories, or 200 kilocalories. A gallon of gasoline contains 31,000 kilocalories.

1. What is defined as the amount of energy needed to raise the temperature of 1
gram of water 1 degree Celsius called?

2. What type of unit is the calorie?

3. How do calorie and Calorie (or food calorie) differ? Which one is actually a
kilocalorie?

4. A Calorie equals ________________ joules.

For the following, show all of your work in order to receive full credit.

5. Look at the following information regarding Calories.
 1 gram of a carbohydrate equals 4 Calories.
 1 gram of a protein equals 4 Calories
 1 gram of a fat equals 9 Calories.

a. A Big Mac from McDonalds has 45 grams of carbohydrates, 25 grams of
protein, and 29 grams of fat. Use this information and the information above to
determine the number of Calories in a Big Mac.
b. How many calories are in a Big Mac?

c. How many joules are in a Big Mac?

6. a. A large order of fries from McDonalds has 23 grams of carbohydrates, 0
grams of protein, and 47 grams of fat. How many Calories are in a large order of
fries?

b. How many calories are in the large order of fries?

c. How many joules are in the large order of fries?

7. a. A Chick-Filet chicken biscuit has 44 grams of carbohydrates, 18 grams of
protein, and 19 grams of fat. How many Calories does a Chick-Filet chicken
biscuit have?

b. How many calories does a Chick-filet chicken biscuit have?

c. How many joules are in a Chick-filet chicken biscuit?

8. A Grande soft taco from Taco Bell has 45 grams of carbohydrates, 19 grams
of protein, and 21 grams of fat. How many Calories does this taco have?

b. How many calories does this taco have?

c. How many joules does this taco have?

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