Exam1_key_W09 - Name: ANSWER KEY Chem 230 Exam #1 February...

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Name: ANSWER KEY Chem 230 Exam #1 February 3, 2009 Discussion Section #: INSTRUCTIONS: Use only the space provided to answer the questions. If you need more work space, start your answer on the back of a page and then write only your final answer in the space provided. Anything written in the margins and on the back of pages will not be graded. Make sure your final answer is clearly marked . Multiple choice: Mark all multiple choice clearly, by both circling the correct choice and writing the letter. Each multiple choice question is worth 3 points. Short answer: Most questions can be answered solely with numbers, equations/expressions, or short phrases. When asked to "explain" or "justify," use a maximum of two sentences or an annotated equation. If the question does not ask you to "explain" or "justify," you do not need to do so. Provide units for all final numerical answers, if any. Showing clear work within the space provided is recommended for calculations to allow for partial credit. When provided, all final answers should be placed in the box provided for the question. Short answer questions are worth the number of points indicated on the problem. The exam totals to 150 points. A periodic table is attached as the last page of the exam. 1
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Name: ANSWER KEY 1) Which of the following compounds is most likely a reducing agent? a) H 2 O(g) *b) Na(s) c) HClO 4 d) F 2 e) All of the above f) None of the above Na is 0, preferred state is +1, so will be oxidized (reducing agent). 2) What type of reaction is N 2 (g) + O 2 (g) → 2 NO(g)? a) Acid/base *b) Redox c) Both d) Neither All atoms change oxidation state. 3) OH - is a stronger Lewis base than NH 3 . A reaction is conducted with 1 mol of Ni 2+ , 6 mol of NH 3 , and 2 mol of OH - , and the resulting complex has a square planar geometry. Which of the following is most likely the formula for the complex? a) Ni(NH 3 ) 6 2+ b) Ni(NH 3 ) 4 (OH) 2 *c) Ni(NH 3 ) 2 (OH) 2 d) Ni(OH) 4 2- e) Ni(NH 3 ) 2 (OH) 4 2- f) None of the above Square planar = 4 ligands, OH - will go in preferentially until used up, then NH 3 . 4) Which kind of metal-ligand interaction increases the bond order between the ligand and metal? a) Sigma donation b) Pi donation c) Backbonding *d) All of the above e) None of the above 5) A coordination complex of Fe 3+ has at least one unpaired electron. Is the complex high spin or low spin? a) High spin b) Low spin *c) Could be either high spin or low spin d) Neither high spin nor low spin Because Fe 3+ has 5 e - in d -orbitals, any geometry could be either high or low spin here. 2
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Name: ANSWER KEY 6) How many unpaired electrons are present in a low spin octahedral Ir 3+ coordination complex? *a) 0 b) 1 c) 2 d) 3 e) 4 f) 5 Ir 3+ has 6 d electrons, all paired in the lower d orbitals.
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Exam1_key_W09 - Name: ANSWER KEY Chem 230 Exam #1 February...

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