What's the difference between single displacement and double displacement reactions? Explain with example.
Answers
Explanation:
In single displacement reaction,a metal reacts with a compound and displaces the compound which consists of a bond of a metal and non metal and forms a new compound.
Zn + H2SO4 react to form ZnSO4 + H2
Note that the metal(Zinc) which displaces the other metal(Hydrogen) which is the part of the compound should be more reactive.
In double displacement,two compounds react with each other and form two new compounds which are entirely different from the previous ones.
AgCl + NaNO3 react to form NaCl + AgNO3.
Here,two compounds react and the metal sodium being more reactive than silver displaces it and forms NaCl,thus,the silver gets displaced and reacts with Nitrate(NO3) which was earlier with sodium.
Answer:
Single Displacement reaction :
1) In a displacement reaction, a more reactive element replaces a less reactive element from a compound.
2) In a displacement reaction, one displacement takes place.
A + BX → AX + B
3) Change in color takes place with no precipitate forms.
4) Metals react with the salt solution of another metal.
5) Examples:
- 2KI + Cl2 → 2KCl + I2 is a displacement reaction.
- CuSO4 + Zn → ZnSO4 + Cu is also a displacement
Double Displacement reactions :
1) In a double displacement reaction, two atoms or a group of atoms switch places to form new compounds.
2) In a double displacement reaction, two displacements take place to complete the reaction.
AB + CD → AC + BD
3) Precipitate is formed.
4) Salt solutions of two different metals react with each other.
5) Examples:
- Na2SO4 + BaCl2 → BaSO4 + 2NaCl is a double displacement reaction.
- 2KBr + BaCl2 → 2KCl + BaBr2 is also a double displacement reaction.
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