Download Worksheet – Measuring Heat

Worksheet – Measuring Heat
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DIRECTIONS: SHOW ALL WORK INCLUDING FORMULA. BOX IN YOUR ANSWERS
1. A fast-food item contains 544 nutritional Calories. Convert this energy to calories and to joules. (544,000 cal ;
2.28 x 106 J)
2. An endothermic process absorbs 138 kJ. How many calories of heat are absorbed?(3.30 x 104 cal)
3. An exothermic reaction releases 325000 calories. Convert this energy to kJ. (1360 KJ)
4. If the temperature of 34.4 g of ethanol increases from 25.0oC to 78.8oC, how much heat has been absorbed by the
ethanol? (4.52 x 103 J)
5. A 4.50g nugget of pure gold absorbed 276 J of heat. What was the final temperature of the gold if the initial
temperature was 25.0oC? The specific heat of gold is 0.129 J/(g x oC). (5.00 x 102 oC)
6. A 155g sample of an unknown substance was heated from 25.0oC to 40.0oC. In the process, the substance
absorbed 5696 J of energy. What is the specific heat of the substance? (2.45 J/g x oC)
7. If 335g water at 65.5oC loses 9750 J of heat, what is the final temperature of the water? (58.5 oC)
8. The temperature of a sample of water increases from 20.0oC to 46.6oC as it absorbs 5650 J of heat. What is the
mass of the sample? (50.8 grams)
9. How many joules of heat are lost by 3580kg granite as it cools from 41.2oC to -12.9oC? (-1.56 x 108 J)
10. How much heat is absorbed by a 2000 kg granite boulder as energy from the sun causes its temperature to change
from 10oC to 29oC? (30,000,000 J or 30,000 kJ)
11. A 15.75-g piece of iron absorbs 1086.75 joules of heat energy and its temperature changes from 25oC to 175oC.
Calculate the specific heat capacity of iron. (0.46 J/g x oC)
12. How many joules of heat are needed to raise the temperature of 10.0g of aluminum from 22oC to 55oC, if the
specific heat of aluminum is 0.90 J/ (g x oC)? (3.0 x 102 J)
13. To what temperature will a 50.0 g piece of glass raise if it absorbs 5275 joules of heat and its specific heat
capacity is 0.50 J/(g x oC)? The initial temperature of the glass is 20.0oC. (231 oC)
14. Calculate the heat capacity of a piece of wood if 1500.0 g of the wood absorbs 6.75 x 104 joules of heat, and its
temperature changes from 32oC to 57oC. (1.8 J/g x oC)
15. 100.0mL of 4.0oC water is heated until its temperature is 37oC. If the specific heat of water is 4.184 J/(g x oC),
calculate the amount of heat energy needed to cause this rise in temperature. (14000 J)
16. 25.0 g of mercury is heated from 25oC to 155oC, and absorbs 455 joules of heat in the process. Calculate the
specific heat capacity of mercury. (0.14 J/g x oC)
17. What is the specific heat capacity of silver metal if 55.00 g of the metal absorbs 47.3 calories of heat and the
temperature rises 15.0oC? (0.240 J/g x oC)
18. If a sample of chloroform is initially at 25oC, what is its final temperature if 150.0g of chloroform absorbs 1.0
kilojoules of heat, and the specific heat of chloroform is 0.96 J/(g x oC)? (32 oC)