SI EXAM #3 REVIEW

# SI EXAM #3 REVIEW - David Jessica and Josh CHEM 105a SI...

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David, Jessica, and Josh CHEM 105a SI Exam Review #3 Drs. Parr & Bertolini October 24, 2010 www.usc.edu/si 1 1. Fill in the following table. This will help us to gain an understanding of the conventions that we use when dealing with internal energy calculations. 2. If the internal energy of a thermodynamic system is increased by 300. J while 100. J work is done by the system, how much heat was transferred and in which direction, to or from the system? 3. Consider a mixture of air and gasoline vapor in a cylinder with a piston (e.g. a car engine). The original volume is 40.0 cm 3 . If the combustion of this mixture releases 800. J of energy, to what volume will the gases expand against a constant external pressure of 875 torr if all the energy of combustion is converted into work to push back the piston? Not e : 1 L*atm = 101 . 3 J . 4. Identify the following processes as endothermic or exothermic. a. Ice cubes melting in your drink _____________________ E± \$ UHDFWLRQ ZLWK ¨+ ²³´µ N- _____________________ c. Adding concentrated nitric acid to water _____________________ d. Evaporation of sweat from the surface of your skin _____________________ 5. A cubic piece of uranium metal (C U = 0.117 J/g C) at 200.0 C is dropped into 1.00 L of d = 4.211 J/g C) at 25.5 C. The final temperature of the uranium and deuterium oxide mixture is 28.5 C. Given the densities of uranium (19.05 g/cm 3 ) and deuterium oxide (1.11 g/mL), what is the edge length of the cube of uranium? q (h e at) (+) ________ gains thermal energy (-) ________ loses thermal energy w (work) (+) work is done _____ the system (-) work is done _____ the system E ( c hang e in int e rnal e n e rgy) (+) energy flows ______ the system (-) energy flows _______ the system

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David, Jessica, and Josh CHEM 105a SI Exam Review #3 Drs. Parr & Bertolini October 24, 2010 www.usc.edu/si 2 6. In a coffee-cup calorimeter, 50.0 mL of 0.100 M AgNO
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SI EXAM #3 REVIEW - David Jessica and Josh CHEM 105a SI...

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