chm 2045 exam 1 key fall 06

chm 2045 exam 1 key fall 06 - CHM 2045 Exam 1 (Form Code A)...

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CHM 2045 Exam 1 (Form Code A) September 29, 2006 Instructions This exam consists of 20 multiple choice questions each worth 10 points for a total maximum of 200 pts. You may retain your exam sheet (mark your answers on it). Turn in only the scantron. You may not use anything but your own calculator and pencil during this exam, sharing is not allowed. Your name on this exam states the assertion: “ I hereby pledge that I have neither given nor received unauthorized aid during this exam.” 1. Balance the following chemical equation: C 8 H 18 O 3 + O 2 H 2 O + CO 2 The coefficient in front of O 2 in the balanced equation (using the smallest whole numbers possible) is: (1) 8 (2) 9 (3) 11 (4) 29 (5) 53 2. How many cubic meters are there in 12.2 cubic feet? (1 inch = 2.54 cm) (1) 0.345 (2) 200 (3) 3.45 x 10 3 (4) 3.45 x 10 5 (5) 2.00 x 10 -9 3. What mass of sodium hydroxide (in grams) should be dissolved in water to prepare 250 mL of 0.200M solution? (1) 2.00 x 10 3 g (2) 80g (3) 2.00g (4) 40.0g (5) 20.0g 4. If 0.250 moles of bromine and 0.600 moles of ammonia react according to the equation below, what is the maximum amount of ammonium bromide (in moles) produced? 3 B r 2 (g) + 8 NH 3 (g) 6 NH 4 Br(s) + N 2 (g) (1) 0.250 mol (2) 0.450 mol (3) 0.500 mol (4) 0.600 mol (5) 0.800 mol 5. Which of the following ions has the same number of electrons and neutrons? (1)
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chm 2045 exam 1 key fall 06 - CHM 2045 Exam 1 (Form Code A)...

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