Spring 09 Recitation Quiz 8

Spring 09 Recitation Quiz 8 - CHEM 0120 Golde SPRING 2009...

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CHEM 0120 SPRING 2009 Monday 1:00 PM Golde QUIZ 8 WEEK 10 March 16, 2009 Name_______________________________ 1. Give the oxidation state of N in each of the following compounds: NH 3 , Ca(NO 3 ) 2 , N 2 O. Show your work for Ca(NO 3 ) 2 . 2. Three adjacent elements in the third period of the periodic table are all colored. Two of these elements are solids at room temperature; the third is a gas. Identify the elements, giving your reasoning; give their colors and state which one is a gas. 3. Complete and balance the following equation for a chemical reaction. Any correct answer will be accepted. S(s) + F 2 (g) ANSWERS 1. -3, +5, +1. For Ca(NO 3 ) 2 , the anion is NO 3 - ; as O has an oxidation state of -2, X + 3(-2) = -1, yielding X = +5 2. The only colored elemental gases are F 2 and Cl 2 , so the answer must be P, S and Cl. P can be off-white, red or black, S is yellow and Cl 2 is yellow-green. 3. S(s) + 2 F 2 (g) SF 4 (g) OR S(s) + 3 F 2 (g) SF 6 (g) CHEM 0120 SPRING 2009 Monday 6:00 PM Golde QUIZ 8 WEEK 10 March 16, 2009 For Make-up Only Regular recitation Day: Time: instructor: Quiz Score: Group score: Scores recorded by:
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Name_______________________________ 1. a) Give the definition of either the ionization energy or the electronegativity of an element. b) Describe how the ionization energy AND the electronegativity of the elements vary throughout the periodic table. Give the major trends only. 2. The following list of four oxides includes an acidic, a basic, an amphoteric and a neutral oxide. Which is which? Give your reasoning. N 2 O K 2 O ZnO SO 2 3. Write a balanced equation for the reaction between nitrogen dioxide and water. Caution: this is a redox reaction. ANSWERS 1a) Ionization energy is the energy needed to remove an electron from the isolated atom. Electronegativity represents the ability of an atom to attract an electron from a neighboring atom to which it is bonded. b) IE and EN both increase from the lower left region of the periodic table to the top right region. (Noble gases have high IEs, but ENs are not defined for them). 2. K 2 O is basic (Group I oxide); SO 2 is acidic (typical nonmetal oxide) ZnO is amphoteric (Zn is close to the metal-nonmetal border in the periodic table; OR Zn 2+ has acidic properties) N 2 O is neutral (special case of an oxide of a nonmetal in a low oxidation state) 3. 3 NO 2 + H 2 O 2 HNO 3 + NO CHEM 0120 SPRING 2009
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This note was uploaded on 04/06/2009 for the course CHEM 0120 taught by Professor Golde during the Spring '07 term at Pittsburgh.

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Spring 09 Recitation Quiz 8 - CHEM 0120 Golde SPRING 2009...

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