2009HE1key - Name:____________________________________ CHEM...

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Unformatted text preview: Name:____________________________________ CHEM 1211: Principles of Chemistry I Hour Exam I September 18, 2009 BE SURE THAT NUMERICAL ANSWERS ARE GIVEN TO THE PROPER NUMBER OF SIGNIFICANT FIGURES AND INCLUDE UNITS!!! SHOW YOUR WORK TO OBTAIN PARTIAL CREDIT!!! PUT ANSWERS IN THE SPACE PROVIDED!!! GOOD LUCK!!! 1. (Isotopes) Fill in the blanks in the following table: (1 point/blank) Isotopic Symbol # of protons # of neutrons # of electrons 16 O 2 8 8 10 195 Pt 4+ 78 117 74 183 W 74 109 74 73 As 3- 33 40 36 51 Cr 3+ 24 27 21 2. Give the most likely ion formed by the following elements (2 points each): a. S S 2- b. I I c. Al Al 3+ d. Na Na + 3. Give the formula of the ionic compound formed by the following pairs of elements (2 points each). a. Na, I NaI b. Al, S Al 2 S 3 4. Specify the number of significant figures in each of the following measurements (2 points each): a. 2430 3 b. 0.0261140 6 c. 6.070 10-15 4 d. 0.0007 1 5. Fill in the missing information in the following table (1 point/space): 5....
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