Q4. What are combination reactions? Explain types of combination reactions with examples.
Answers
A combination reaction is a general category of chemical reactions. It may be defined as a chemical reaction in which two or more substances combine to form a single substance under suitable conditions. Combination reactions are also known as synthesis, because in these reactions new substances are synthesized.
Answer:
a combination reaction is reaction where two or more elements or compounds combines to form a single compound.
1) in this type of combination reaction ,an element combines with another element to form a new compound.
Eg: elements - nitrogen and hydrogen when passed over finally divide iron combine to produce pungent smelling gas ,ammonia
N2+3H2=2NH3
2)In second type combination reaction , an element combines with the compound .
Eg: when a reaction takes place between a compound so2 and an element oxygen to produce sulphur trioxide .
2SO2 + O2= 2SO3.
3) in this combination , two or more compounds combine to form a new compound .
Eg: reaction in which lime reacts vigorously with water to form a white powder calcium hydroxide, known as slaked lime .
CaO+H2O= Ca(OH)2