Answers

2015-05-22T09:36:31+05:30
COMBINATION REACTION:- It is a chemical reaction in which reactants combine to give a single product. 
                               A + B 
⇒ AB
DECOMPOSITION REACTION:- It is a chemical reaction in which a compound breaks down into two or more simpler products.
                               AB 
A + B
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2015-05-22T10:59:17+05:30
-Combination reaction:
reaction in which two or more reactants combine to form one product  is called combination reaction.
for example: magnesium + oxygen = magnesium oxide

-Decomposition Reaction:
reaction in which a single substance is decomposed or separated into two or more substance.
for example:
calcium carbonate heated and formed calcium oxide + carbon dioxide
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