13. A box of graham crackers is labeled “120 Calories per serving.” Assuming this means 120kcal, and recalling that 4.16 J = 1 cal. Which of the following is the energy of a serving of the graham crackers? A. 4.2 x 103 J B. 5 x 104 J C. 120 J D. 5 x 105 J
14. A 1.50 L (1.50Kg) tap water was heated from an initial temperature of 30.0°C to a final temperature of 80.0°C. How much heat must be added to the water?
A. 214 000 J B. 328 000 J C. 314 000 J D. 228 000 J
15. The temperature of 100 g of water is to be raised from 10°C to 90°C. Which is the energy needed to do this change?
A. 8 x 103 cal B. 1 x 103 cal C. 6 x 103 cal D. 5 x 103 cal
14. A 1.50 L (1.50Kg) tap water was heated from an initial temperature of 30.0°C to a final temperature of 80.0°C. How much heat must be added to the water?
A. 214 000 J B. 328 000 J C. 314 000 J D. 228 000 J
15. The temperature of 100 g of water is to be raised from 10°C to 90°C. Which is the energy needed to do this change?
A. 8 x 103 cal B. 1 x 103 cal C. 6 x 103 cal D. 5 x 103 cal
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