A Combination Reaction or a Synthesis Reaction is a

 

general category of a chemical reaction (the term usually

 

refers to an inorganic chemical reaction), in which two or

 

more reagents are chemically bonded together to produce a single product.

 

For example, the addition of sodium and chlorine to form sodium chloride or common table salt.

is a combination reaction.

 

Chemical decomposition or analysis is the fragmentation

of a chemical compound into elements or smaller

compounds. It is sometimes defined as the opposite of a

 chemical synthesis. Chemical decomposition is often an

undesired chemical reaction. The stability that a chemical

 compound ordinarily has is eventually limited when

exposed to extreme environmental conditions like heat,

radiation, humidity or the acidity of a solvent. The details

of decomposition processes are generally not well

defined, as a molecule may break up into a host of smaller

fragments. Chemical decomposition is exploited in several

 analytical techniques, notably mass spectrometry,

traditional gravimetric analysis, and thermogravimetric analysis.

 

The generalized reaction formula for chemical decomposition is:

AB --> A + B  

with a specific example being the electrolysis of water to

 

gaseous hydrogen and oxygen:

2H2O ----> 2H2 + O2  

An example of spontaneous decomposition is that of hydrogen

 

peroxide, which will slowly decompose into water and oxygen:

2H2O2 ---> 2H2O + O2 

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