Exam 1_120A_Aut11 - key A & B

Exam 1_120A_Aut11 - key A & B - Name: _ CHEM 120A, Exam...

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Name: __________________________ CHEM 120A, Exam 1A, Oct. 25, 2011 1. Multiple choice (24 pts total, 3 pts each). Clearly mark your answer. Choose only one answer for each question. (1) A temperature of 41°F is the same as a. 5.0°C b. 310°C c. -9.0°C d. 16°C e. 42°C (2) The measurement 0.000 0043 m, expressed correctly using scientific notation, is a. 4.3 x 10 -7 m b. 4.3 x 10 -6 m c. 4.3 x 10 6 m d. 0.43 x 10 -5 m e. 4.3 m (3) Which of the following statements is(are) true? I. An excited atom can return to its ground state by absorbing electromagnetic radiation. II. The energy of an atom is increased when electromagnetic radiation is emitted from it. III. The energy of electromagnetic radiation increases as its frequency increases. IV. An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency. V. The frequency and wavelength of electromagnetic radiation are inversely proportional to each other. a. II, III, IV b. III, V c. I, II, III d. III, IV, V e. I, II, IV
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(4) Which of the following measurements are NOT equivalent? a. 25 mg = 0.025 g b. 183 L = 0.183 kL c. 150 msec = 0.150 sec d. 84 cm = 8.4 mm e. 24 dL = 2.4 L (5) Raising the temperature of 10.0 g of water from 10.0°C to 20.0°C requires 100.0 cal of energy, while raising the temperature of 10.0 g of aluminum from 10.0°C to 20.0°C requires 22 cal. More calories are required to heat the water because a. Water is a liquid and aluminum is a solid at 10.0°C. b. Ten grams of water occupies a larger volume than 10.0 g of aluminum c. Water has a greater potential energy than aluminum d. Water has a larger specific heat than aluminum e. 10.0°C is closer to the melting point of water than to the melting point of aluminum. (6)
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This note was uploaded on 01/18/2012 for the course CHEM 120A taught by Professor Leahmiller during the Fall '11 term at University of Washington.

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Exam 1_120A_Aut11 - key A & B - Name: _ CHEM 120A, Exam...

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