Question

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Define the fallowing terms with example reaction
(a) Precipitation reaction
(b) Exothermic reactions
(c) double displacement​

Answer 1

Answer:

a) A reaction in which an insoluble soli substance is formed is called precipitation reaction. Double displacement reactions are precipitation reactions.

ex: Na2SO4+BaCl2=BaSO4+2NaCl

(precipitate)

b) During a chemical change, when bonds are formed energy ( mostly in the form of heat ) is evolved or given out, such reactions in which heat is evolved along with the formation of new products is called exothermic reactions.

ex: C+O2=CO2+393.7kJ(heat=-393.7kJ)

c) A reaction in which two reacting molecules exchange their partner ions in aqueous solution is double displacement reactions.

ex: AgNO3+NaCl=AgCl+NaNO3

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