practice_midterm1_c

practice_midterm1_c - THIS EXAM DOES NOT NECESSARILY...

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THIS EXAM DOES NOT NECESSARILY REPRESENT THE LAYOUT OR QUESTIONS FOUND ON EXAM I. USE IT ONLY AS A GUIDE FOR STUDYING. Part A : Multiple Choice – Concepts and Calculations. Write the correct answer in the space provided on the first page. No partial credit will be given. 1. For the reaction H 2 (g) + 1/2 O 2 (g) H 2 O(g) where H = -241.8 kJ / mol, what quantity of heat is liberated by the reaction of 10.0 L of H 2 measured at 22.0 ºC and 742 mmHg? a. 120 kJ b. 2610 kJ c. 1310 kJ d. 195 kJ e. 97.5 kJ 2. What is the work done in joules by the system when H 2 expands against a constant pressure of 75 atm at 45.3 ºC? The change in volume is 24.0 L. a. 1.8 x 10 3 b. -8.2 x 10 4 c. 8.2 x 10 4 d. 1.8 x 10 5 e. -1.8 x 10 5 3. Compute H for the reaction: 2 MnO 2 (s) + CO(g) Mn 2 O 3 (s) + CO 2 (g) a. -347.3 kJ b. -46.1 kJ c. -217.5 kJ d. -104.5 kJ e. -389.1 kJ 4. An example of a fossil fuel is: a. the sun b. chlorophyll c. water d. natural gas e. carbon dioxide 5. A 0.90 g sample of liquid water was introduced into an evacuated 2.00 L flask, which was then sealed and heated to 37 ºC. What percentage, by mass, of the water remained as liquid? [Vapor pressure of water at 37 ºC = 48.2 Torr] a. 10% b. 18% c. 82% d. 90% e. 0% 6. Under which of the following conditions will vaporization best occur? a. high mass, large surface area, high kinetic energy b. weak forces between molecules, high kinetic energy, large surface area c. high molecular energy, small surface area d. low kinetic energy, strong molecular forces, large surface area e. small surface area, low kinetic energy, low molecular mass 7. A liquid is in equilibrium with its vapor. If some of the vapor is allowed to escape, what is the immediate result? a. condensation rate decreases b. vaporization rate increases c. condensation rate increases d. vaporization rate decreases e. none of these 8. If a substance has a heat of condensation of -1.46 kJ/g and a heat of sublimation of 4.60
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practice_midterm1_c - THIS EXAM DOES NOT NECESSARILY...

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