Why is respiration considered an exothermic reaction ? Explain.
Energy is required to support life. Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process.
$\underset{Glucose}{\mathop{{{C}_{6}}{{H}_{12}}{{O}_{6(aq)}}}}\,+\underset{~Oxygen~}{\mathop{6{{O}_{2(g)}}}}\,\to \underset{Carbon\text{ }dioxide}{\mathop{6C{{O}_{2(g)}}}}\,+\underset{Water}{\mathop{6{{H}_{2}}{{O}_{(l)}}}}\,$ $+$ Energy
A solution of a substance $‘X’$ is used for whitewashing.
$(i)$ Name the substance $‘X’$ and write its formula.
$(ii)$ Write the reaction of the substance $‘X’$ named in $(i)$ above with water.
Why does the colour of copper sulphate solution change when an iron nail is dipped in it ?
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.
Oil and fat containing food items are flushed with nitrogen. Why ?
Explain the ''Corrosion'' terms with one example.