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10 Cards in this Set
- Front
- Back
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oxidation is |
loss of electrons |
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reduction is |
gain of electrons |
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oxidation number of hydrogen = |
+1 except in metal hydrides which contain -1 |
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oxidation number of oxygen = |
-2 except in peroxides H2O2 where it is -1 and oxygen fluoride f2o where it is +2 |
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if an element is oxidised its oxidation number |
increases |
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is an element is reduced its oxidation number |
decreases |
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what colour is potassium dichromate ? |
orange |
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what is potassium dichromates properties? |
an oxidising agent, if alkali is added to these ions they turn yellow as the yellow chromate ions form. |
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the value of the electrode potential will change if? |
- conc of the solution changes -temp changes |
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what is platinum black used for? |
a spongy form of platinum which gives the electrode a big SFA so that the equilibrium is set up more quickly. |
