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Related Flashcards
Cards In This Set
| Front | Back |
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Any element in the free state (not
combined with another element) has an
oxidation number of ___
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0
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The oxidation number of any monatomic
ion equals ________________
|
The charge of the ion
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Oxygen in compounds is assigned an oxidation number of ___, except in peroxides in which it has an oxidation number of ___
|
2- 1-
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Hydrogen in compounds has an oxidation number of ___, except in metal hydrides in which it has an oxidation number of ___
|
1+ 1-
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Group 1A (alkali metals) elements always have an oxidation number of ___ in compounds
|
1+
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Group 2A (alkali earth metals) elements always have an oxidation number of ___ in compounds
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2+
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Boron and aluminum always have an oxidation number of ___ in compounds
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3+
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In binary compounds with metals the nonmetallic elements of group 6A (chalcogens) generally have an oxidation number of ___
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2-
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In binary compounds with metals the elements of group 7A (halogens) have an oxidation number of ___
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1-
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The charge of a polyatomic ion is considered its ___ oxidation number. Example: SO42-
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Net, SO42- has a net oxidation number of 2-
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In assigning oxidation numbers in a compound, the elements closest to ______ in the periodic table are always assigned the negative oxidation number. Example: P4O10
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Fluorine, In P4O10 oxygen has the negative oxidation number of 2-
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For neutral compounds the sum of the oxidation numbers of all atoms in the compound must equal ___. Example: Na2S
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0, Na2 (2 x 1+) + S (2-) = 0
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For polyatomic ions the sum of the oxidation numbers of the elements must equal _______________. Example: CO32-
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The charge of the ion, O3 (3 x 2-) + C (must be 4+) = 2-
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