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chm 2045 exam 1 key - CHM 2045 Exam 1(Form Code A...

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CHM 2045 Exam 1 (Form Code A) September 22, 2007 Instructions: On your scantron sheet enter your name, UF ID number (start on the first space and leave the last space blank), Discussion Section No. and Form Code (see above). This exam consists of 25 multiple choice questions each worth 10.0 points for a total maximum of 250 pts. You may retain your exam sheet (mark your answers on it and the scantron sheet). Turn in only the scantron. Bubbling errors of any kind will count as an incorrect response or result in the loss of points. 1. An auto bumper is coated with a layer of chromium, 0.017 cm thick. The bumper has a surface area of 3.43 x 10 4 cm 2 . The density of chromium metal is 7.19 g/cm 3 . How many atoms of chromium are used in the coating? (1) 81 (2) 5.8 x10 2 (3) 4.2 x 10 3 (4) 4.9 x 10 25 (5) 2.5 x 10 27 2. An Erlenmeyer flask weighs 241.3 g when empty. When filled with water (density = 1.00 g/cm 3 ), the flask and its contents weigh 489.1 g. How much does the flask weigh when filled with chloroform (density of chloroform = 1.48 g/cm 3 )? (1) 367 g (2) 248 g (3) 489 g (4) 608 g (5) 695 g 3. The density of carbon tetrachloride is 1.59 g/mL. How many chlorine atoms are present in 55 mL of carbon tetrachloride? (1) 3.3 × 10 23 atoms (2) 5.4 × 10 23 atoms (3) 1.4 × 10 24 atoms (4) 8.1 × 10 27 atoms (5) 3.2 × 10 28 atoms 4. An electron moves in a vacuum between two oppositely-charged parallel plates, initially on a path between and parallel to the two plates. How will the electron be deflected?
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