Homework_2_01-09-09_C&A

Homework_2_01-09-09_C&A - drawn as heat from your...

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Biology 5A Homework 2 January 9-12, 2009 1. Which of the following does NOT represent a polar covalent bond? A. H-O B. C=O C. C-H D. H-N E. N=C (Ans. C) 2. In which of the following could *** represent a hydrogen bond? A. C H *** O C B. N H *** H O C. O H *** H O D. N H *** O C E. All of these *** could represent hydrogen bonds. (Ans. D) 3. During heavy exercise or hot weather, sweating helps to keep your body temperature from going too high. Evaporating sweat carries heat away from your body because: A. Water molecules in sweat contain more energy than water molecules in blood. B. Conversion of liquid water in sweat to water vapor requires energy to break the covalent bonds between the oxygen and hydrogen atoms in water, and this energy is drawn as heat from your body. C. Conversion of liquid water in sweat to water vapor requires energy to break the hydrogen bonds between water molecules, and this energy is
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Unformatted text preview: drawn as heat from your body. D. The energy of ionic bonds in the salt in sweat is transferred to the water molecules before they evaporate. E. Water in sweat has stronger covalent bonds than water in blood. (Ans. C) 4. A 2-ounce bag of trail mix contains 130 kcal. If you eat and completely digest this 2 ounces of trail mix, approximately how many grams of water will you have to evaporate as sweat to lose this 130 kcal of energy? A. 65 g of water B. 0.224 g of water C. 130 g of water D. 224 g of water E. 75400 g of water (Ans. D) 5. You drink a 300 ml bottle of chilled (4 degrees C) Arrowhead Mountain Spring Water. Approximately how much heat energy is drawn from your body to warm this 300 ml of water up to your body temperature of 37 degrees C? The mass of 1 ml of water is 1 g. A. 330 cal B. 9.90 kcal C. 300 kcal D. 8.1 cal E. 144 kcal (Ans. B)...
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Homework_2_01-09-09_C&A - drawn as heat from your...

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