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General Chemistry Principles, Patterns, and Applications, 2011

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d. How many kilojoules of energy are stored in the potato?<br />

e. Which releases more energy—digestion of the potato or combustion of the potato?<br />

10. Adipose (fat) tissue consists of cellular protoplasm, which is mostly water, <strong>and</strong> fat globules. Nearly all the<br />

energy stored in adipose tissue comes from the chemical energy of its fat globules, totaling approximately<br />

3500 Cal per pound of tissue. How many kilojoules of energy are stored in 10 g of adipose tissue? How many<br />

50 g brownies would you need to consume to generate 10 lb of fat? (Refer to Table 5.5 "Approximate<br />

Compositions <strong>and</strong> Fuel Values of Some Common Foods" for the necessary caloric data.)<br />

11. If a moderate running pace of 5 min/km expends energy at a rate of about 400 kJ/km, how many 8 oz apples<br />

would a person have to eat to have enough energy to run 5 mi? How many 4 oz hamburgers? (Refer to Table<br />

5.5 "Approximate Compositions <strong>and</strong> Fuel Values of Some Common Foods" for the necessary caloric data.)<br />

12. Proteins contain approximately 4 Cal/g, carbohydrates approximately 4 Cal/g, <strong>and</strong> fat approximately 9 Cal/g.<br />

How many kilojoules of energy are available from the consumption of one serving (8 oz) of each food in the<br />

table? (Data are shown per serving.)<br />

Food Protein (g) Fat (g) Carbohydrates (g)<br />

sour cream 7 48 10<br />

banana 2 1 35<br />

cheeseburger 60 31 40<br />

green peas 8 1 21<br />

13. When you eat a bowl of cereal with 500 g of milk, how many Calories must your body burn to warm the milk<br />

from 4°C to a normal body temperature of 37°C? (Assume milk has the same specific heat as water.) How<br />

many Calories are burned warming the same amount of milk in a 32°C bowl of oatmeal from 32°C to normal<br />

body temperature? In some countries that experience starvation conditions, it has been found that infants<br />

don’t starve even though the milk from their mothers doesn’t contain the number of Calories thought<br />

necessary to sustain them. Propose an explanation for this.<br />

14. If a person’s fever is caused by an increase in the temperature of water inside the body, how much additional<br />

energy is needed if a 70 kg person with a normal body temperature of 37°C runs a temperature of 39.5°C? (A<br />

person’s body is approximately 79% water.) The old adage “feed a fever” may contain some truth in this case.<br />

How many 4 oz hamburgers would the person need to consume to cause this change? (Refer to Table 5.5<br />

"Approximate Compositions <strong>and</strong> Fuel Values of Some Common Foods" for the necessary caloric data.)<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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