A man who has recently moved to live in a city that sits at approximately 1,000 meters above sea level, decides to cook pasta for lunch. He follows the directions that he is used to, and he heats water in a pan and leaves the pasta to cook in the water for 10 minutes. However, after he tastes the pasta, it turns out it is still not fully cooked. Why do you think this happened?

A man who has recently moved to live in a city that sits at approximately 1,000 meters above sea level, decides to cook pasta for lunch. He follows the directions that he is used to, and he heats water in a pan and leaves the pasta to cook in the water for 10 minutes. However, after he tastes the pasta, it turns out it is still not fully cooked. Why do you think this happened?

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter6: Thermochemistry

Section: Chapter Questions

Problem 95AE: It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous...

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Evaporation of sweat requires energy and thus take excess heat away from the body. Some of the water that you drink may eventually be converted into sweat and evaporate. If you drink a 20-ounce bottle of water that had been in the refrigerator at 3.8 C, how much heat is needed to convert all of that water into sweat and then to vapor? (Note: Your body temperature is 36.6 oc. For the purpose of solving this problem, assume that the thermal properties of sweat are the same as for water.)
A quantity of ice at 0C is added to 64.3 g of water in a glass at 55C. After the ice melted, the temperature of the water in the glass was 15C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(g C).
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The enthalpy of vaporization of water is larger than its enthalpy of fusion. Explain why.
Will a closed container of water at 70 C or an open container of water at the same temperature cool faster on a cold winter day? Explain why.
It has been determined that the body can generate 5500 kJ of energy during one hour of strenuous exercise. Perspiration is the bodys mechanism for eliminating this heat. What mass of water would have to be evaporated through perspiration to rid the body of the heat generated during 2 hours of exercise? (The heat of vaporization of water is 40.6 kJ/mol.)
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Which evolves more energy on cooling from 50 C to 10 C: 50.0 g of water or 100. g of ethanol (Cethanol = 2.46 J/g K)?