Exchange reactions or double decompositions

These reactions involve the exchange of cations and anions between two solids. The reaction can be represented in the following form  

Refer to the reaction between lithium bromide and potassium fluoride  

It should be noted that the reactions between two solids are sometimes accompanied, at least temporarily, by the production of secondary compounds. 

Weak modification of the reaction conditions, such as temperature, partial pressure of a gas component, morphology of a solid, can also direct the reaction. 

the reaction between silicon and cuprons chloride(I) can lead to the formation of not only copper metal but also copper silicides according to  

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