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chem ch 5

# chem ch 5 - Chemistry 11e(Brown/LeMay/Bursten/Murphy...

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Chemistry, 11e (Brown/LeMay/Bursten/Murphy) Chapter 5: Thermochemistry 5.1 Multiple-Choice and Bimodal Questions 1) Calculate the kinetic energy in J of an electron moving at 6 6.00 10 m / s × . The mass of an electron is 28 9.11 10 g - × . A) 48 4.98 10 - × B) 14 3.28 10 - × C) 17 1.64 10 - × D) 48 2.49 10 - × E) 14 6.56 10 - × Answer: C Diff: 2 Page Ref: Sec. 5.1 2) Calculate the kinetic energy in joules of an automobile weighing 2135 lb and traveling at 55 mph. (1 mile = 1.6093 km, 1lb = 453.59 g).

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3) The kinetic energy of a 7.3 kg steel ball traveling at 18.0 m/s is __________ J. 4) Calculate the kinetic energy in joules of a 150 lb jogger (68.1 kg) traveling at 12.0 mile/hr (5.36 m/s). 5) Calculate the kinetic energy in joules of an 80.0 g bullet traveling at 300.0 m/s. A) 6 3.60 10 × B) 4 1.20 10 × C) 3 3.60 10 × D) 12.0 E) 80.0 Answer: C Diff: 2 Page Ref: Sec. 5.1
Chemistry, 11e (Brown/LeMay/Bursten/Murphy) Chapter 5: Thermochemistry 6) The kinetic energy of a 23.2-g object moving at a speed of 81.9 m/s is __________ J. 7) The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is __________ J. 8) The kinetic energy of a 23.2-g object moving at a speed of 81.9 km/hr is __________ kcal.

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9) A 100-watt electric incandescent light bulb consumes __________ J of energy in 24 hours. [1 Watt (W) = 1 J/sec] A) 3 2.40 10 × B) 3 8.64 10 × C) 4.17 D) 3 2.10 10 × E) 6 8.64 10 × Answer: E Diff: 3 Page Ref: Sec. 5.1 10) The ΔE of a system that releases 12.4 J of heat and does 4.2 J of work on the surroundings is __________ J. 11) The value of ΔE for a system that performs 213 kJ of work on its surroundings and loses 79 kJ of heat is __________ kJ.
12) Calculate the value of ΔE in joules for a system that loses 50 J of heat and has 150 J of work performed on it by the surroundings. 13) The change in the internal energy of a system that absorbs 2,500 J of heat and that does 7,655 J of work on the surroundings is __________ J. A) 10,155 B) 5,155 C) -5,155 D) -10,155 E) 7 1.91 10 × Answer: C Diff: 2 Page Ref: Sec. 5.2

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chem ch 5 - Chemistry 11e(Brown/LeMay/Bursten/Murphy...

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