Question

Write the balanced chemical equation for the following and identify the types of reaction in each case.
a) Calcium hydroxide (aq) + Nitric acid (aq)$ \to $ Water (l) + Calcium nitrate (aq)
b) Magnesium (s) + Iodine (g) $ \to $Magnesium iodide (s)
c) Magnesium (s) + Hydrochloric acid (aq) $ \to $Magnesium chloride (aq) + Hydrogen (g)
d) Zinc (s) + Calcium chloride (aq) $ \to $Zinc chloride (aq) + Ca (s)

Answer 1

Hint: A balanced chemical equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. It is also defined as balancing the stoichiometric coefficients and the number of moles of reactants and products in a chemical reaction.

Complete step by step answer:

Let us balance each chemical equation one by one.
a) Calcium hydroxide (aq) + Nitric acid (aq)$ \to $ Water (l) + Calcium nitrate (aq)
The symbolic representation of the reaction is:
$Ca{(OH)_2}(aq) + HN{O_3}(aq) \to {H_2}O(l) + Ca{(N{O_3})_2}(aq)$
The balanced chemical equation of the reaction is:
$Ca{(OH)_2}(aq) + 2HN{O_3}(aq) \to 2{H_2}O(l) + Ca{(N{O_3})_2}(aq)$
It is an example of a double displacement reaction.
b) Magnesium (s) + Iodine (g) $ \to $Magnesium iodide (s)
The symbolic representation of the reaction is:
$Mg(s) + {I_2}(g) \to Mg{I_2}(s)$
This reaction is already balanced and is an example of a combination reaction.
c) Magnesium (s) + Hydrochloric acid (aq) $ \to $Magnesium chloride (aq) + Hydrogen (g)
The symbolic representation of the reaction is:
$Mg(s) + HCl(aq) \to MgC{l_2}(aq) + {H_2}(g)$
The balanced chemical equation of the reaction is:
$Mg(s) + 2HCl(aq) \to MgC{l_2}(aq) + {H_2}(g)$
The reaction is an example of a displacement reaction.
d) Zinc (s) + Calcium chloride (aq) $ \to $Zinc chloride (aq) + Ca (s)
The symbolic representation of the reaction is:
$Zn(s) + CaC{l_2}(aq) \to ZnC{l_2}(aq) + Ca(s)$
The reaction is already balanced and is an example of a double displacement reaction.

Note:
A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule. A double-replacement reaction is a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).