chem midterm #2 memorization

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Last updated 5:21 AM on 10/13/26
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11 Terms

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  1. Elemental substance


Oxidation number = 0

2
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  1. Monatomic ions


Oxidation number equal to the ion’s charge

3
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  1. Metals


Group 1 metals = assign +1

Group 2 metals = assign +2

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  1. Fluorine


Always -1

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  1. Hydrogen


+1 if combined with non-metals

-1 if only with metals

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  1. oxygen


-2 unless it’s the only element left

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  1. Halogens


-1 unless only element left

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  1. Other nonmetals


Typical ionic charge unless only element left

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  1. Total charge


Set oxidation numbers of only remaining elements so that the sum of the oxidation numbers = the total charge of the molecule or ion

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Exothermic process

Releases heat. Converts PE into KE

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Endothermic process

Absorbs heat. Converts KE into PE