Chem 152 ALL HW practice

Chem 152 ALL HW practice - 1. 5/5 points All Submissions...

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Unformatted text preview: 1. 5/5 points All Submissions Notes Question: ZumChemP6 9.E.015. Consider the accompanying diagram. Ball A is allowed to fall and strike ball B. Assume that all of ball A's energy is transferred to ball B, at point I, and that there is no loss of energy to other sources. What is the kinetic energy and the potential energy of ball B at point II? The potential energy is given by PE = mgz , where m is the mass in kilograms, g is the gravitational constant (9.8 m/s 2 ), and z is the distance in meters. kinetic energy potential energy 2. 5/5 points All Submissions Notes Question: ZumChemP6 9.E.020. Calculate the internal energy change for each of the following. (a) One hundred seventeen ( 117 ) joules of work are required to compress a gas. At the same time, the gas releases 23 J of heat. (b) A piston is compressed from a volume of 8.30 L to 2.80 L against a constant pressure of 1.90 atm. In the process, there is a heat gain by the system of 352 J. (c) A piston expands against 1.19 atm of pressure from 11.2 L to 29.1 L. In the prcess, 1037 J of heat is absorbed. 3. 5/5 points All Submissions Notes Question: ZumChemP6 9.E.022. Consider a mixture of air and gasoline vapor in a cylinder with a piston. The original volume is 30 . cm 3 . If the combustion of this mixture releases 1125 . J of energy, to what volume will the gases expand against a constant pressure of 645 . torr if all the energy of combustion is converted into work to push back the piston? 4. 5/5 points All Submissions Notes Question: ZumChemP6 9.E.026. Are the following processes exothermic or endothermic? (a) the combustion of gasoline in a car engine <INPUT TYPE=\ radio NAME= RC_822997_5_1_829771 VALUE= 1 DISABLED> MACROBUTTON HTMLDirect exothermic<INPUT TYPE=\ radio NAME= RC_822993_3_0_829767 VALUE= 1 DISABLED> MACROBUTTON HTMLDirect endothermic (b) CO 2 ( s ) → CO 2 ( g ) <INPUT TYPE=\ radio NAME= RC_822993_3_1_829767 VALUE= 0 DISABLED> MACROBUTTON HTMLDirect exothermic<INPUT TYPE=\ radio NAME= RC_822997_5_1_829771 VALUE= 1 DISABLED> MACROBUTTON HTMLDirect endothermic 5. 5/5 points All Submissions Notes Question: ZumChemP6 9.E.029. The overall reaction in a commercial heat pack can be represented in the reaction given below. 4 Fe( s ) + 3 O 2 ( g ) → 2 Fe 2 O 3 ( s ) Δ H = −1652 kJ (a) How much heat is released when 4.09 mol iron is reacted with excess O 2 ? (b) How much heat is released when 1.24 mol Fe 2 O 3 is produced?...
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This note was uploaded on 03/08/2012 for the course CHEM 152 taught by Professor Chiu during the Spring '08 term at University of Washington.

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Chem 152 ALL HW practice - 1. 5/5 points All Submissions...

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