Rules for assigning Oxidation Numbers
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Elements? | Oxidation number is zero
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| Monotomic ions? Like Fe- | charge on the ion
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| Oxygen? | -2 in most compounds
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| Hydrogen? | +1 in most compounds. Oxidation number of hydrogen is -1 in a binary compound with a metal such as CaH2.
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| Halogens? | The oxydation number for flourine in all of its compounds is -1. All other Halogens have an oxidation number of -1 in binary compounds, excpet when the other element is another Halogen above it or oxygen.
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| Compounds and ions? | The sum of the oxidation # of the atoms in a compound equals zero. In polyatiomic ion the sume of the oxidation numbers equals the charge of the ion.
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| What rule allows you to see if your correct? | The rule for Compounds and ions.
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| Define what it means when something has been oxidized? | The oxidation # goes up.
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| What does it mean when something has been reduced? | the oxidation # goes down.
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| An oxidizing agent is... | something that oxidizes something else, and in doing so its oxidation number goes down.
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| A reducing agent is | something that reduces something else, and in doing something it gets oxidized.
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Created by:
empittsley
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