When an electric current passes through water, _____ takes place, breaking down the compound into hydrogen and oxygen. a physica
2 answers:
Answer: a chemical change
Explanation:
A physical reaction is defined as the reaction in which a change in shape, size takes place. No new substance gets formed in these reactions. Example: melting of ice
A chemical reaction is defined as the reaction in which a change in chemical composition takes place.A new substance is formed in these reactions.
Decomposition of water using electric current to produce hydrogen and oxygen is called as electrolysis and is a chemical change.
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The cell notation is:
here in cell notation the left side represent the anodic half cell where right side represents the cathodic half cell
in anodic half cell : oxidation takes place [loss of electrons]
in cathodic half cell: reduction takes place [gain of electrons]
1) this is a galvanic cell
2) the standard potential of cell will be obtained by subtracting the standard reduction potential of anode from cathode
Therefore
3) as the value of emf is positive the reaction will be spontaneous as the free energy change of reaction will be negative
Δ
As reaction is spontaneous and there will be conversion of chemical energy to electrical energy it is a galvanic cell.