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What is the difference between displacement and double displacement reactions? Write equations for these reactions.
Answer
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DISPLACEMENT REACTION |
DOUBLE DISPLACEMENT REACTION |
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A more reactive element takes the place of a less reactive element in a chemical compound |
Two compounds react and their positive and negative ions switch places to form 2 new products |
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Only one species is displaced and replaced from a compound |
Displacement and replacement of 2 species takes place |
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Occurs in accordance with the reactivity series |
Occurs wherever ions can be exchanged in compounds |
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Example: Fe(s) + CuSO 4 (aq) → FeSO 4 (aq) + Cu(s) Iron displaces Copper from Copper Sulphate solution as Iron is more reactive than Copper and Copper gets deposited on the Iron nail
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Example: Na 2 SO 4 (aq) + BaCl 2 (aq) → BaSO 4 (s) + 2NaCl (aq) Na + combines with Cl - , forming NaCl Ba 2+ combines with (SO 4 ) 2- forming BaSO 4 BaSO 4 precipitate is formed
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