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CHEM101-2007FALL-EXAM_2-ANSWERS - Chemistry 101/111 2nd...

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Chemistry 101/111 2nd Hour Examination November 9, 2007 1a CHEMISTRY 101/111, FALL 2007 Second Hour Examination ANSWERS DO NOT BEGIN TO WORK ON THE EXAMINATION UNTIL THE PROCTOR TELLS YOU TO DO SO! INSTRUCTIONS: Before you begin the examination, please fill-in the identification information requested on the answer sheet. You must use a No. 2 pencil to fill in this information. In the STUDENT ENROLLMENT SHEET section of the form, fill in the I.D. NUMBER (your person number, format = 12345678-- , i.e., left adjusted with two blank spaces on the right ), NAME (your last name, first name, M.I. ), and CODE (your recitation section code, format = ab ) fields. Be sure to fill in the correct circles completely. Your examination score cannot be credited to the correct person if the computer cannot read the bubbled in information. In the SCORE SHEET section of the form, sign your name on the line for NAME. + #2 ! h = J For each question you are to fill in the circle on the answer sheet that corresponds to the BEST answer . Make sure the answer number used is the same as the question number! Use a No. 2 pencil ; make heavy marks that fill-in the circle; erase completely any answer you wish to change. Questions with more than one answer marked will be graded as incorrect. The only answers that will be accepted are those which appear on the bubble sheet. . The examination consists of 25 questions (plus one bonus question), each of which bears 4 points. Check that you have a complete examination (10 pages). Please place your name on the top of every page. Do not leave any answers blank - guess if you don't know. Do not make any stray marks on the answer sheet! Use the space between the problems on the examination pages for your scratch work. Raise your hand if you have a question or need a pencil. PLEASE READ AND THEN SIGN THE ACADEMIC HONESTY STATEMENT BELOW. I hereby certify that the answers given to this examination represent my own unaided work. Signature ________________________________________ Key A, Person Number __ __ __ __ - __ __ __ __ Printed Name ____________________________________ Recitation Section Code __ __ first last THIS FORM MUST BE TURNED IN WITH YOUR ANSWER SHEET AT THE END OF THE EXAMINATION OR THE ANSWER SHEET WILL NOT BE GRADED.
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Chemistry 101/111 2nd Hour Examination November 9, 2007 2a Name___________________________________________ 1. Which of the following chemical equations corresponds to the standard molar enthalpy of formation of N 2 O? (A) NO(g) + 1/2 N 2 (g) N 2 O(g) (B) N 2 (g) + 1/2 O 2 (g) N 2 O(g) * (C) 2 N(g) + O(g) N 2 O(g) (D) N 2 (g) + O(g) N 2 O(g) (E) 2 N 2 (g) + O 2 (g) 2 N 2 O(g) 2. Commercial cold packs consist of solid ammonium nitrate and water. NH 4 NO 3 absorbs 3.30 × 10 2 J of heat per gram dissolved in water. In a coffee-cup calorimeter, 4.40 g NH 4 NO 3 is dissolved in 100.0 g of water at 21.0 ° C. What is the final temperature of the
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CHEM101-2007FALL-EXAM_2-ANSWERS - Chemistry 101/111 2nd...

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