Worksheet 7

Worksheet 7 - Worksheet 7 - Oxidation/Reduction Reactions...

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Worksheet 7 - Oxidation/Reduction Reactions Oxidation number rules : Elements have an oxidation number of 0 Group I and II – In addition to the elemental oxidation state of 0, Group I has an oxidation state of +1 and Group II has an oxidation state of +2 . Hydrogen –usually +1 , except when bonded to Group I or Group II, when it forms hydrides, -1 . Oxygen usually -2 , except when it forms a O-O single bond, a peroxide, when it is -1 . Fluorine is always -1 . Other halogens are usually -1, except when bonded to O. 1. Assign oxidation numbers to each of the atoms in the following compounds: Na 2 CrO 4 Na = O = Cr = K 2 Cr 2 O 7 K = O = Cr = CO 2 O = C = CH 4 H = C = HClO 4 O = H = Cl = MnO 2 O = Mn = SO 3 2- O = S = SF 4 F = S = a. What is the range of oxidation states for carbon ? b. Which compound has C in a +4 state? c. Which compound has C in a -4 state?
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2. Nitrogen has 5 valence electrons (Group V). It can gain up to 3 electrons (-3), or lose up to 5 (+5) electrons. Fill in the missing names or formulas and assign an oxidation state to each of the following nitrogen containing compounds: During chemical reactions, the oxidation state of atoms can change. This occurs when compounds gain or lose electrons, or when the bonds to an atom change. This is illustrated by the reaction between nitrogen and hydrogen to make ammonia: N 2 (g) + 3 H 2 (g) 2 NH 3 (g) a. Assign oxidation numbers to each of the atoms in this reaction. N (in N
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This note was uploaded on 12/05/2011 for the course CHEM 231 taught by Professor Beck during the Spring '11 term at Indiana.

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Worksheet 7 - Worksheet 7 - Oxidation/Reduction Reactions...

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