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112910apchem

# 112910apchem - David Kim Period 7-8 APCHEM 10 How is...

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David Kim APCHEM Period 7-8 11/29/10 10. How is average bond strength related to relative potential energies of the reactants and the products? Products that have lower potential energy have higher average bond strength. Those that have a higher potential energy have lower average bond strength. 12. What is the difference between ∆ H and ∆ E ? E is the internal energy of a system that is changed, while ∆ H is the change of enthalpy. 18. Calculate the kinetic energy of a 1.0 X 10 -5 -g object with a velocity of 2.0 X 10 5 cm/s. KE = ½ (1.0 X 10 -5 -g) (2.0 X 10 5 cm/s)² KE= 20000 g cm 2 /s KE= .02 kg m 2 /s = .02 J 26. A piston performs work of 210. L atm on the surroundings, while the cylinder in which it is placed expands from 10. L to 25L. At the same time, 45 J of hear is transferred from the surroundings to the system. Against what pressure was the piston working? W = -P∆V 210. L atm = -P (10-25 L) 210. L atm = -P (-15 L) P = 14 atm. 32. The reaction SO 3 (g) + H 2 O(l) H 2 SO 4 (aq) is the last step in the commercial production of sulfuric acid. The enthalpy change for this reaction is -227 kJ. In designing a sulfuric acid plant, is it necessary to provide for

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112910apchem - David Kim Period 7-8 APCHEM 10 How is...

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