Chem 1045C Test 3 Monday October 30th 2006 - version 1 answers

Chem 1045C Test 3 Monday October 30th 2006 - version 1 answers

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Name……………………………………. . Recitation # ……………… Chem 1045C Test 3 Monday 30 th October 2006 - 45 mins Show all your working in numerical problems to gain full credit. Avogadro’s # = 6 x 10 23 /mol 1 Show which elements change their oxidation numbers in these reactions and how they change and then balance the equations. a) ....CH 4 + 2 .NO 2 ….N 2 + ….CO 2 + 2 .H 2 O 2 Element… C …….changes from ON#. .... –4 ....... to ON#. ......... +4 ............. 2 Element… N …….changes from ON#. ..... +4 ...... to ON#. ........... 0 ........... 2 b) ….Cr 2 O 7 2– + . . 2 ..AsH 3 + ….H 2 O = 2 .Cr(OH) 3 + .. 2 ..As + 2 .OH 2 Element… Cr …….changes from ON#. ... +6 ........ to ON#. ...... +3 ................ 2 Element… As …….changes from ON#. ..... –3 ...... to ON#. ......... 0 ............. 2 2 In this reaction:- Ca(OH) 2 (aq) + 2HCl(aq) = CaCl 2 (aq) + 2H 2 O(l) 25.0mL of 1.50M calcium hydroxide solution is titrated to the end-point with 18.5mL of a solution of hydrochloric acid. (H=1, O=16, Cl=35.5, Ca=40)
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This test prep was uploaded on 04/20/2008 for the course CHM 1045 taught by Professor Bush during the Fall '08 term at FSU.

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Chem 1045C Test 3 Monday October 30th 2006 - version 1 answers

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