Chem 1045C Test 3 Monday October 30th 2006 - version 2 answers

Chem 1045C Test 3 Monday October 30th 2006 - version 2 answers

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Name……………………………………. . Recitation # ……………… Version 2 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 ….H 2 SO 4 + 2 .CH 2 O ….H 2 S + 2 .H 2 O + … 2 ..CO 2 2 Element…… S ….changes from ON#. .... +6 ....... to ON#. ......... –2 ............. 2 Element…… C ….changes from ON#. ..... 0 ...... to ON#. ......... +4 ............. 2 b 2 .SbH 3 + ….Cr 2 O 7 2–- + ….H 2 O 2 ..Sb +… 2 ..Cr(OH) 3 +… 2 .OH 2 Element…… Sb .changes from ON#. ... –3 ........ to ON#. ...... 0 ........ 2 Element…… Cr ….changes from ON#. .... +6 ....... to ON#. ..... +3 ........ 2 2 In this reaction, Ba(OH) 2 (aq) + 2HBr(aq) BaBr 2 (aq) + 2H 2 O(l) 20mL of 1.25M barium hydroxide solution is titrated to the end-point with 14.3mL of hydrobromic acid. (H=1, O=16, Br=80, Ba= 137)
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Chem 1045C Test 3 Monday October 30th 2006 - version 2 answers

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