(a) Define a combination reaction.
(b) Give one example of a combination reaction which is also exothermic.
(c) Give one example of a combination reaction which is also endothermic.
(a) Define a combination reaction.
(b) Give one example of a combination reaction which is also exothermic.
(c) Give one example of a combination reaction which is also endothermic.
(a)
In combination reactions, two or more substances combine to form a new compound. Only one product is obtained in such reactions. The reactants in such reactions can be elements as well as compounds. The general equation used to represent a combination reaction is:
A+Z⟶AZ
(b)
Calcium oxide reacts vigorously with water to produce calcium hydroxide.
A large amount of heat is also evolved during this process, which increases the temperature of the system. Hence, the combination of calcium oxide and water is exothermic in nature.
(c)
The high-temperature combination of nitrogen and oxygen to form nitric oxide (NO) is an endothermic reaction.
N2+O2⟶2NO−180.6kJ
(a)
In combination reactions, two or more substances combine to form a new compound. Only one product is obtained in such reactions. The reactants in such reactions can be elements as well as compounds. The general equation used to represent a combination reaction is:
A+Z⟶AZ
(b)
Calcium oxide reacts vigorously with water to produce calcium hydroxide.
A large amount of heat is also evolved during this process, which increases the temperature of the system. Hence, the combination of calcium oxide and water is exothermic in nature.
(c)
The high-temperature combination of nitrogen and oxygen to form nitric oxide (NO) is an endothermic reaction.
N2+O2⟶2NO−180.6kJ
