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1. Define combination reaction. Give one example for an exothermic combination reaction.
 
A combination reaction occurs when . It is also referred to as a synthesis reaction or composition reaction. For example,
 
 
2. Differentiate reversible and irreversible reactions.
 
Reversible reaction:
 
A reversible reaction is a reaction in which the products .
 
Irreversible reaction:
 
The reaction that is called an irreversible reaction.