Question

Describe how oxidation and reduction involve electrons, change oxidation numbers, and combine in oxidation reduction reactions

Answer 1

Oxidation is the loss of electrons.

Reduction is the gain of electrons.

Oxidation increases the oxidation number.

Reduction decreases the oxidation number.

In an oxidation-reduction reaction, the electrons from the oxidized atom or ion are transferred to the atom or ion that is reduced.

Step-by-step explanation:

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Answer 2

Answer: Oxidation is defined as the reaction in which there is loss of electrons. It is accompanied by increase in oxidation number.

`Zn\rightarrow Zn^(2+)+2e^(-)`

Zinc in solid state has oxidation number of zero and on losing electrons changes to
`Zn^(2+)` with oxidation number of +2.

Reduction is defined as the reaction in which there is gain of electrons. It is accompanied by decrease in oxidation number.

`2H^++e^(-)\rightarrow H_2`

Hydrogen ions with +1 oxidation state gains electrons and converts to molecular hydrogen with oxidation state of zero.

In the given redox reaction, both oxidation and reduction takes place. They go hand in hand.

`Zn+H_2SO_4\rightarrow ZnSO_4 +H_2`

Zinc converts to
`Zn^(2+)` and gets oxidized.
`H^+` gains electron and convert to
`H_2`.