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Chemistry
Redox
Question | Answer |
---|---|
Redox is... | Reduction and oxidation (transfer of electrons) |
Oxidation is... | The loss of electrons, the gain of oxygen and the loss of hydrogen and increase in oxidation state |
Reduction is... | The gain of electrons, the loss of oxygen and the gain of hydrogen and decrease in oxidation state |
An oxidising agent... | Oxidises something and is itself reduced, an electron donor |
A reducing agent... | Reduces something and is itself oxidised, an electron acceptor |
Oxidation state or number... | Is the number of electrons lost, gained or shared by an atom in a compound |
What is the oxidation state/number of an element? | 0 |
What is hydrogen's (H) oxidation state? | +1 (exception of LiH- H= -1) |
What is oxygen's (O) oxidation state? | -2 (exceptions are: H2O2- O= -1 & OF2- O= +2) |
What is fluorine's (F) oxidation state? | -1 |
What is chlorine's (Cl) oxidation state? | -1 (exceptions are compounds with O or F) |
What are group 1 oxidation states? | +1 |
What are group 2 oxidation states? | +2 |
What is a disproportionation reaction? | A reaction in which the same species is both oxidises and reduced |