Ch6(3-4)Feb29SP08

Ch6(3-4)Feb29SP08 - CHEMISTRY 109 SPRING 2008 29 February...

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CHEMISTRY 109 SPRING 2008 29 February 2008 Announcements: No MasteringChemistry this weekend !!
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Chemistry 109 Spring 2008 Exam 2 Average: 70.7%
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When gasoline burns in a car engine, the heat released causes the products CO 2 and H 2 O to expand, which pushes the pistons outward. Excess heat is removed by the cooling system. If the expanding gases do 451 J of work on the pistons and the system loses 325 J to the surroundings as heat, what is the change in energy (ΔE) in Joules? The system is the reactants and products. Heat is released by the system, work is done by the system. Solution: ΔE = - 776 J
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In a reaction, gaseous reactants form a liquid product. The heat absorbed by the surroundings is 26.0 kcal, and the work done on the system is 15.0 Btu. Calculate ΔE in kJ. (1 cal = 4.184 J, 1 Btu = 1055 J) 1) + 5 kJ 2) – 125 kJ 3) -93 kJ 4) -11 kJ 5) +11 kJ
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Quantity of Heat Energy Absorbed Heat Capacity when a system absorbs heat, its temperature increases the increase in temperature is directly proportional to the amount of heat absorbed this proportionality constant is called the heat capacity, C units of C are J/°C or J/K q = C x T the heat capacity of an object depends on its mass 200 g of water requires twice as much heat to raise its temperature by 1°C than 100 g of water the heat capacity of a substance depends on the type of
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Ch6(3-4)Feb29SP08 - CHEMISTRY 109 SPRING 2008 29 February...

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