3.1.7 REDOXS
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Oxidation state?
Indicator of degree of oxidation of an atom in chemical compound
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Rule of pure elements?
0
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Flourine?
Always -1
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Oxygen?
-2 BUT:
-1 in peroxides eg H202
+2 with Fluorine
-1 in peroxides eg H202
+2 with Fluorine
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Other halogens?
-1 BUT:
can be positive with F or O
can be positive with F or O
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Hydrogen?
+1 with non-metal
-1 with metals
-1 with metals
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Group 1/2/3?
+1, +2, +3
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whats disproportionation reactions
The species is simultaneously oxidised and reduced
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steps for writing half equations
1)Calculate oxidation states
2)Balance atoms not O or H
3) Sort out Oxygen by adding H20s
4)Sort out hydrogen by adding H+
5)Sort out electrons
2)Balance atoms not O or H
3) Sort out Oxygen by adding H20s
4)Sort out hydrogen by adding H+
5)Sort out electrons
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How to combine half equations
1)Multiply half equations so electrons will cancel out
2)Combine and cancel anything that comes in both sides
2)Combine and cancel anything that comes in both sides
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