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exam1key - Chemistry 115a Professors Mak and Bau Thursday,...

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Chemistry 115a Name Professors Mak and Bau Last 4 Digits of SID# ____ - ____ - ____ - ____ Thursday, September 18, 2008 Lab Day & Time Hour Exam 1 First Letter of Family Name Question Points Score Grader 1 14 2 12 3 10 4 16 5 15 6 5 7 8 8 20 TOTAL 100 Instructions: 1. There are a total of eleven (11) pages. Count the pages before you begin. 2. You must show your work to receive full credit (except for multiple choice questions). 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. Do not use pencil. ACADEMIC INTEGRITY (Please sign below) : I certify that I have observed all the rules of ACADEMIC INTEGRITY while taking this exam. (signature)
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Last Name: ______________________ 2 1. Answer the following questions. (No partial credits) (a) (4 points) Carry out the following operations and express the answers with the appropriate number of significant figures: (i) 4.321 × 5.6789 ÷ 9.11 (ii) (1.23 × 10 4 ) + (4.56 × 10 2 ) + (7.89 × 10 3 ) (b) (2 points) What has 5 protons, 6 neutrons and 6 electrons? (circle correct answer) (i) 10 5 B (ii) 10 6 B + (iii) 11 5 B (iv) 11 6 C (v) 11 6 C + (vi) 10 5 C (vii) none of the above (c) (2 points) What has 6 protons, 5 neutrons and 5 electrons? (circle correct answer) (i) 11 5 B (ii) 11 6 B (iii) 10 5 B + (iv) 10 6 C (v) 11 6 C (vi) 11 5 C + (vii) none of the above (d) (2 points) Which one of the following statements about atomic structure is false? (circle correct answer) (i) The electrons occupy a very large volume compared to the nucleus. (ii)
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This note was uploaded on 12/12/2010 for the course CHEM 115A taught by Professor Mak,bradforth during the Fall '10 term at USC.

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exam1key - Chemistry 115a Professors Mak and Bau Thursday,...

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