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chemistry as level topic 3 redox
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- 1what are the main rues from oxidation numberssingle elements = 0
pairs of identical atoms = 0
monoatomic ion = same as it's charge
molecular ions = sum of all is the charge
hydrogen = 1+
oxygen + 2-
group 6 and 7 = 6+ and 7+
group 1 and 2 = 1+ and 2+ - 2how do you know if something has been oxidisedthere is a loss of electrons, so increased oxidation number
- 3how do you kno0w if something has been reducedthere had been a gain of electrons, so lower oxidation number
- 4what is a disproportionation reactionone element is simultaneously oxidised and reduced
- 5what is a half equationit shows the electrons that are being lost/gained. combining two half equations gives the full equation.
- 6how to write a half equationseparate the elements. write an equation for each, balancing out the elements, adding water/oxygen if needed, and then adding electrons to balance out the charges. now balance the 2 equations so there are the same number of electrons. then add the 2 equations together.
- 7how to write a normal redox equationwrite the oxidation number of everything under the equation. add numbers to beginning of elements to balance out the oxidation numbers of the elements. add water/hydrogen if needed.
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- chemistry as level topic 3 redox
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- Talya Hambling
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