F05-ex2A - Chemistry 12 Exam II Form A October 26, 2005...

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1 Chemistry 12 Name _______________________ Exam II Form A Section _______________________ October 26, 2005 Student No. _______________________ IMPORTANT : On the scantron (answer sheet), you MUST clearly fill your name , your student number , section number , and test form (white cover = test form A; yellow cover = test form B). Use a #2 pencil. There are 28 questions on this exam. Check that you have done all of the problems and filled in the first 28 bubbles on the scantron. The maximum score on this exam is 35 points. Your score will be reported in percents (max 100%). Exam policy No electronic devices, except for simple scientific calculators are allowed. Specifically calculators with text-programmable memory or communication capabilities are not allowed. Relevant data and formulas, including the periodic table, are attached at the end of this exam. Your grade will be based only on what is on the scantron form. The answer key will be posted on the web after the exam (under "News"). Hints As you read the question, underline or circle key words to highlight them for yourself. Avoid errors from "mis-reading" the question. Pay attention to units and magnitudes (decimal places) of numbers obtained from calculations. There is no penalty for guessing. 2 CHEMISTRY 12 EXAM 2 OCTOBER 26, 2005 FORM A ---------------------------------------------------------------------------------------------- 1. Rank these species in order of increasing bond length. A. NO 3 < NO 2 < NO B. NO 2 < NO < NO 3 C. NO < NO 2 < NO 3 D. NO 2 < NO 3 < NO E. NO 3 < NO < NO 2 ---------------------------------------------------------------------------------------------- 2. “X” is an unknown element which forms an acid, HXO 3 . The mass of 0.0107 mol of this acid is 1.38 g. Find the atomic mass of X and identify the element represented by X. The element X is: A. N B. Cl C. P D. Br E. I ---------------------------------------------------------------------------------------------- 3. How many grams of hydrogen are in 46 g of CH 3 OH? A. 0.36 g B. 1.5 g C. 2.8 g D. 4.0 g E. 5.8 g ------------------------------------------------------------------------------------------------- 4. A compound is composed of 70.6% C, 5.9% H, and 23.5% O by mass. The molecular weight of the compound is 136 amu. What is the compound’s molecular formula? A. C 8 H 8 O 2 B. C 7 H 4 O 3 C. C 4 H 4 O D. C 9 H 12 O E. C 7 H 20 O 2 ---------------------------------------------------------------------------------------------
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3 --------------------------------------------------------------------------------------------- 5. What is the formula weight of aluminum sulfate?
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This note was uploaded on 05/24/2009 for the course CHEM 110 taught by Professor Hofmann,brucerob during the Fall '08 term at Pennsylvania State University, University Park.

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F05-ex2A - Chemistry 12 Exam II Form A October 26, 2005...

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