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Unformatted text preview: Name _________________________ Chemistry 112 Section ____________ EXAM III Total Points = 125 TA ___________________________ Monday, 8:30 PM April 7, 2008 Directions: 1. Each student is responsible for following directions. Read this page carefully. 2. Write your name and other requested information on this page and on the separate answer sheet. 3. CODE your name on the answer sheet using an ordinary (#2) pencil. 4. CODE your correct 10-digit identification number (PUID) on the answer sheet. THIS IS VERY IMPORTANT! 5. CODE your lab section number on the answer sheet. Please use all four digits, 0101, 0102, 0201, etc. This is also very important! 6. Put all calculations on the examination pages. DO NOT PUT ANY EXTRA MARKS ON THE COMPUTER ANSWER SHEET! 7. This exam consists of 30 multiple-choice questions worth 4.17 points each. Choose the one best or correct answer for each question and write it both on your exam paper and on the computer answer sheet. The computer answer sheet is the only one that will be graded! 8. This exam consists of 8 pages plus a Periodic Table. Please check to be sure that you have them all! END OF EXAM 1) Please make sure that you have entered 30 answers on your scan sheet. 2) Make sure that you have entered your name, ID number, and lab section number (4 digits). 3) You MUST turn the scan sheet in to your TA before leaving the exam! Chem 112 – Exam 3 – 04/07/08 2 _____ 1. Identify the oxidation state of C in H 2 CO 3 (a) +3 (b) +1 (c) +4 (d) None of the above _____ 2. Identify the oxidation state of C in CO 2 (a) +2 (b) +4 (c) − 4 (d) None of the above _____ 3. In the following list, identify the redox reaction: (a) H 2 CO 3 + 2 NaOH ! Na 2 CO 3 + 2 H 2 O (b) CO 2 + H 2 O ! H 2 CO 3 (c) Na 2 CO 3 2 Na + + CO 3 − 2 (d) C + O 2 ! CO 2 _____ 4. Carbon derived from coal is often used for extracting metals from metal ores. In the following extraction reaction, identify the reducing agent: SnO 2 + C ! Sn + CO 2 (a) Sn (b) CO 2 (c) C (d) SnO 2 _____ 5. Hydrogen may be used to extract expensive metals from their ores. In the following reaction, identify the electron donor in the redox reaction: WO 3 + 3 H 2 ! W + 3 H 2 O (a) H 2 (b) W (in WO 3 ) (c) O (in WO 3 ) (d) None of the above Chem 112 – Exam 3 – 04/07/08 2 _____ 1. Identify the oxidation state of C in H...
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This note was uploaded on 04/03/2011 for the course CHEM 112 taught by Professor Harwood during the Spring '11 term at Purdue.
- Spring '11