8. Thermochemistry
Nature of Energy
8. Thermochemistry
Nature of Energy - Video Tutorials & Practice Problems
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Thermochemistry is the study of matter and energy associated with chemical reactions or physical changes.
Classification of Energy
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concept
Nature of Energy
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Nature of Energy
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example
Nature of Energy Example 1
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Problem
ProblemAn energy efficient refrigerator uses 780 kWh of electrical energy per year. How many kilocalories of electricity does it use in three years?
A
2.0 x 105 kcal
B
8.3 x 105 kcal
C
2.0 x 106 kcal
D
8.3 x 106 kcal
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PRACTICE PROBLEMS AND ACTIVITIES (14)
- Two positively charged particles are first brought close together and then released. Once released, the repuls...
- Convert between energy units. c. 4.99 * 103 kJ to kWh
- Suppose that a person eats 2387 Calories per day. Convert this amount of energy into each unit. c. kWh
- A particular frost-free refrigerator uses about 745 kWh of electrical energy per year. Express this amount of ...
- The enthalpy of evaporation of water is 40.67 kJ/mol. Sunlight striking Earth's surface supplies 168 W per squ...
- Use of the British thermal unit (Btu) is common in some types of engineering work. A Btu is the amount of heat...
- A watt is a measure of power (the rate of energy change) equal to 1 J/s. (b) An adult person radiates heat to ...
- Assume that the nutritional content of an apple-say, 50 Cal (1 Cal = 1000 cal) - could be used to light a ligh...
- The solar power striking Earth every day averages 168 watts per square meter. The highest ever recorded electr...
- (b) A particular chip snack food is composed of 12% protein, 14% fat, and the rest carbohydrate. What percen...
- (a) A serving of a particular ready-to-serve brown & wild rice meal contains 4.5 g fat, 42 g carbohydrate,...
- Answer the following questions. (e) A gallon of ice cream contains exactly 32 servings, and each serving has 1...
- A bag of Hershey's Kisses contains the following information: Serving size: 9 pieces = 41 g Calories per servi...
- Sucrose (C12H22O11) is produced by plants as follows: 12 CO21g2 + 11 H2O1l2¡ C12H22O11 + 12 O21g2 H = 5645 kJ ...