Chemistry Worksheet Name:

Specific Heat and Calories Period:

1. When a 12.8 grams sample of KCl dissolves in 75.0 grams of water in a calorimeter, the temperature drops from 31.0°C to 21.6°C. Calculate DH for the process.

KCl(s) → K+1(aq) + Cl-1(aq)

2. When a 25.7 gram sample of NaI dissolves in 80.0 grams of water in a calorimeter, the temperature rises from 20.5°C to 24.4°C. Calculate DH for the process.

NaI(s) → Na+1(aq) + I-1(aq)

3. When a 16.9 gram sample of NaOH dissolves in 70.0 grams of water in a calorimeter, the temperature rises from 22.4°C to 86.6°C. Calculate DH for the process.

NaOH(s) → Na+1(aq) + OH-1(aq)

4. When a 19.2 gram sample of KCN dissolves in 65.0 grams of water in a calorimeter, the temperature drops from 28.1°C to 15.4°C. Calculate DH for the process.

KCN(s) → K+1(aq) + CN-1(aq)

5. When a 28.7 gram sample of KI dissolves in 60.0 grams of water in a calorimeter, the temperature drops from 27.2°C to 13.2°C. Calculate DH for the process.

KI(s) → K+1(aq) + I-1(aq)

6. What is the specific heat constant of aluminum if the temperature of a 28.4 gram sample of aluminum is increased by 8.1°C when 207 J of heat is added?

7. What is the specific heat constant of silicon if the temperature of a 4.11 gram sample of silicon is increased by 3.8°C when 11.1 J of heat is added?

8. What is the specific heat constant of gold if the temperature of 8.21 gram sample of gold is increased by 6.2°C when 6.51 J of heat is added?

9. What is the specific heat of silver if the temperature of a 15.4 gram sample of silver is increased by 11.2°C when 40.5 Joules of heat is added?

10. What is the specific heat of titanium if the temperature of a 36.7 gram sample of titanium is increased by 4.8°C when 91.6 joules of heat is added?

Chemistry Worksheet Name:

Specific Heat and Calories Period:

Use the chart below to answer the questions that follow:

Calorie Content of Typical Foods and Their Exercise
Equivalents for a 70 kg (154-pound) Person
Time (Minutes) Spent
Food (Portions) / Calories / Lying Down, Resting / Walking / Bicycle Riding / Swimming / Running
Apple (large) / 101 / 78 / 19 / 12 / 9 / 5
Bacon (2 Strips) / 96 / 74 / 18 / 12 / 9 / 5
Carrot, raw / 42 / 32 / 8 / 5 / 4 / 2
Chicken, fried (½ breast) / 232 / 178 / 45 / 28 / 21 / 12
Egg, Fried / 110 / 85 / 21 / 13 / 10 / 6
Halibut steak (¼ pound) / 205 / 158 / 39 / 25 / 18 / 11
Hamburger sandwich / 350 / 269 / 67 / 43 / 31 / 18
Malted milk shake / 502 / 366 / 97 / 61 / 45 / 26
Milk (1 cup) / 150 / 115 / 28 / 19 / 13 / 7
Orange juice (1 glass) / 120 / 92 / 23 / 15 / 11 / 6
Pizza, cheese / 180 / 138 / 35 / 22 / 16 / 9
Potato chips (1 serving) / 108 / 83 / 21 / 13 / 10 / 6
Soda (1 glass) / 106 / 82 / 20 / 13 / 9 / 5
Tuna fish salad sandwich / 278 / 214 / 53 / 34 / 25 / 14
Shrimp, fried (1 piece) / 180 / 138 / 35 / 22 / 16 / 9
Note: 1 Calorie = 1000 calories, or 1 kilocalorie.

Questions:

1. How many Calories are there in half of a cheese pizza?

2. How many minutes of bicycle riding would be required to utilize the Calories in half of a cheese pizza?

3. Calculate the approximate number of Calories that are burned per minute when resting, walking, bicycle riding, swimming, and running.

4. How long would a person have to walk in order to burn off the Calories in a meal consisting of a glass of soda, a hamburger sandwich, and a serving of potato chips? How long would it take to burn off the same meal if the person road a bicycle? What if the person when running?