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Science department
Prep.3
Chemical Reactions
Breaking down of reactant molecules’ bonds & formation of new bonds in
resultants molecules.
They have important roles in burning of fuel, photosynthesis, medicines,
fertilizers & artificial fibers.
Thermal Decomposition Reactions
They involve the breaking down of the compounds by heating into its
primary elements / simpler compounds.
Substitution Reactions
When an active element replaces another less active element in another
compound.
Simple substitution reactions Double substitution reactions
One element substitutes another less Double exchange between the ions
active in a solution of one of its (radicals) of 2 different compounds.
compounds. Giving 2 new compounds.
Chemical Activity Series (C.A.S)
The arrangement of metals in a descending order
according to the degree of their chemical activity.
Neutralization Reactions
Reaction between acid and alkali to form salt & water.
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Second Term
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