Question

Why are decimposition reactions calledvopposite of combination eeaction?write equations for these reactuons?

Answer 1

Decomposition reaction is the reaction in which a chemical compound decomposes to form 2 or more products. Combination reaction is the reaction in which 2 simple subtances combine to form a single product. Also combination reaction is the opposite of decomposition reaction.
Equations for combination reaction:
2Mg+o2 = 2mgo
H2 + s=h2s
C+2s=cs2
Equations for decomposition
2hgo=2hg+o2
Pcl5=pcl3 +cl2
2h2o=2h2 +o2

Answer 2

Decomposition reaction is the reaction in which a chemical compound decomposes to form 2 or more products. Combination reaction is the reaction in which 2 simple subtances combine to form a single product. Also combination reaction is the opposite of decomposition reaction.

Equations for combination reaction:

2Mg+o2 = 2mgo

H2 + s=h2s

C+2s=cs2

Equations for decomposition

2hgo=2hg+o2

Pcl5=pcl3 +cl2

2h2o=2h2 +o2

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