define displacement reaction according to class 8
Dear Student,
Displacement reaction is a reaction in which a more reactive elementary substance displaces and sets free a constituent element, which is less reactive, from a compound. But there is a single displacement reaction and double.
Single displacement: This is when one element trades places with another element in a compound. These reactions come in the general form of:
A + BC → AC + B
One example of a single displacement reaction is when magnesium replaces copper in copper sulphate to make magnesium sulphate and free copper:
Mg + CuSO4 → MgSO4 + Cu : Mg is more reactive than Cu
Double displacement: This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form:
AB + CD → AD + CB
One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:
Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3
Regards
Displacement reaction is a reaction in which a more reactive elementary substance displaces and sets free a constituent element, which is less reactive, from a compound. But there is a single displacement reaction and double.
Single displacement: This is when one element trades places with another element in a compound. These reactions come in the general form of:
A + BC → AC + B
One example of a single displacement reaction is when magnesium replaces copper in copper sulphate to make magnesium sulphate and free copper:
Mg + CuSO4 → MgSO4 + Cu : Mg is more reactive than Cu
Double displacement: This is when the anions and cations of two different molecules switch places, forming two entirely different compounds. These reactions are in the general form:
AB + CD → AD + CB
One example of a double displacement reaction is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate:
Pb(NO3)2 + 2 KI → PbI2 + 2 KNO3
Regards