Internet Exercises

Triptik for thermochemistry
(http://www.chem.vt.edu/RVGS/ACT/notes/Chap_8_Triptik.html)

Calorimetry is the measurement of heat changes of physical and chemical processes. In the laboratory, these processes are measured in a calorimeter. The Triptik for thermochemistry at http://www.chem.vt.edu/RVGS/ACT/notes/Chap_8_Triptik.html contains two examples of calorimeters. Make sketches of each, and then answer the following.
1. How does a bomb calorimeter differ from a simple coffee cup calorimeter?
2. A quantity of 2.896 g of methanol (CH₃OH) was burned in a constant-volume bomb calorimeter. Consequently, the temperature of the water rose by 6.33°C. If the quantity of water surrounding the calorimeter was exactly 1900 g and the heat capacity of the calorimeter was 2.56 kJ/°C, calculate the molar heat of combustion of methanol.

The Chemistry Tutor
( http://tqd.advanced.org/2923/react2.html)

The Chemistry Tutor provides help on a variety of topics such as chemical reactions, mole/gram conversions, equations, ideal gas laws, and lab safety. Study the information given about combustion reactions at http://tqd.advanced.org/2923/react2.html, and answer the following questions.
1. Is combustion an exothermic or endothermic reaction?
2. Why do you think these reactions occur mostly in automobiles, homes, and factories?
3. What would you need and do to determine the enthalpy change of a specific combustion reaction?
4. Calculate the work done by carbon dioxide if it expands from 3.50 mL to 60.0 mL against a constant pressure of 3.30 atm.

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