Chemical reactions and their types 8 th questions and answers
Answers
Answer:Types of chemical reactions
In general chemical reactions are classified into:
Combination reactions
Decomposition reactions
Single displacement reactions
Double displacement reactions
Combination reactions:
A combination reaction is one in which two or more reactants combine to form a single product. Combination reactions are again of three types.
They are:
Combination reactions between elements.
Combination reactions between compounds.
Combination reactions between elements and compounds.
Combination reactions between elements:
In these reactions elements were combined to form a product.
Examples :
Formation of calcium oxide by the combination elements calcium and oxygen.
2Ca + O2 → 2CaO
Formation of ammonia by the combination of elements nitrogen and hydrogen.
N2 + 3H2 → 2NH3
Combination reactions between compounds:
In these reactions compounds were combined to form product.
Example:
Reaction of calcium oxide in water to form calcium hydroxide
CaO + H2O → Ca(OH)2
Explanation: