What does one mean by exothermic and endothermic reactions ? Give examples.
What does one mean by exothermic and endothermic reactions ? Give examples.
Chemical reactions that release energy in the form of heat, light, or sound are called exothermic reactions.
Example : Mixture of sodium and chlorine to yield table salt
$Na _{(s)}+\frac{1}{2} Cl _{2(s)} \longrightarrow NaCl _{( s )}+411 \,kJ$ of energy
In other words, combination reactions are exothermic.
Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.
For example: In the process of photosynthesis, plants use the energy from the sun to convert carbon dioxide and water to glucose and oxygen.
$6C{{O}_{2(g)}}+6{{H}_{2}}{{O}_{(l)}}\text{ }\xrightarrow{\text{Sunlight}}\text{ }\underset{Glucose}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6(aq)}}}}\,+6{{O}_{2(g)}}$
Similar Questions
Which of the statements about the reaction below are incorrect ?
$2 PbO _{( s )}+ C _{( s )} \longrightarrow 2 Pb _{( s )}+ CO _{2( g )}$
$(a)$ Lead is getting reduced.
$(b)$ Carbon dioxide is getting oxidised.
$(c)$ Carbon is getting oxidised.
$(d)$ Lead oxide is getting reduced.
Which of the statements about the reaction below are incorrect ?
$2 PbO _{( s )}+ C _{( s )} \longrightarrow 2 Pb _{( s )}+ CO _{2( g )}$
$(a)$ Lead is getting reduced.
$(b)$ Carbon dioxide is getting oxidised.
$(c)$ Carbon is getting oxidised.
$(d)$ Lead oxide is getting reduced.
Give an example of a double displacement reaction other than the one given in image.
Give an example of a double displacement reaction other than the one given in image.
$Fe _{2} O _{3}+2 Al \rightarrow Al _{2} O _{3}+2 Fe$
The above reaction is an example of a
$Fe _{2} O _{3}+2 Al \rightarrow Al _{2} O _{3}+2 Fe$
The above reaction is an example of a
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
Explain the ''Corrosion'' terms with one example.
Explain the ''Corrosion'' terms with one example.