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25 Cards in this Set
- Front
- Back
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What is oxidation |
Loss of electrons |
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What is reduction |
Gain of electrons |
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Define oxidation state |
The degree of oxidation/reduction of an atom or element |
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What is the oxidation state of an ion |
The same as the charge |
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What is the sum of oxidation states on a compound |
Zero |
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What is the maximum oxidation state of an atom? |
+ group number |
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What is the minimum oxidation state of an atom |
Group number - 8 |
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What is the oxidation state of oxygem |
Usually -2 |
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When is oxygen not in the -2 oxidation state |
Peroxides (-1) and OF2 (+2) |
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What is the oxidation statemof hydrogen? |
Usually +1 |
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When is hydrogen not in the +1 oxidation state? |
Hydrides (-1) (hydrogen and metal) |
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What is different about d and p block elements |
Oxidation states vary |
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How is the oxidation state of a p/d block element written? |
After the name of the element as Roman nu erals in brackets |
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What do molecular ions ending on -te contain? |
P/d block elements and some oxygen |
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What is the formula for carbonate |
CO3 2- |
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What is the formula for permanganate |
MnO4- |
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What is the formula for dichromate |
Cr2O7 2- |
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What is oxidation (in terms of oxidation states) |
Increase in oxidation state |
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What is reduction (in terms of oxidation state) |
Decrease in oxidation state |
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What is a redox reaction |
A reaction in which reduction and oxidation occur simultaneously |
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What should you calculate in order to explain a redox reaction? |
Oxidation states |
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What is an oxidising agent |
A chemical that causes oxidation in another species |
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What is a reducing agent |
A chemical that causes reduction in another species |
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What happens to oxidising agents when they react |
They accept electrons |
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What happens to reducing agents when they react |
They lose electrons |
