Question

Complete the following chemical reactions.
A. $CaO + {H_2}O \to$
B. $AlC{l_3} + {H_2}O \to$
C. $C{a_3}{N_{2(s)}} + {H_2}{O_{(l)}} \to$
D. $Pb{S_{(s)}} + {H_2}{O_2} \to$

Answer 1

An equation is balanced when the same number of each element is represented on the reactant and product sides. Equations must be balanced to accurately reflect the law of conservation of matter. We need to balance a chemical equation in such a way that the total mass on the reactant side is equal to the total mass on the product side.

Complete step by step answer:
The completely balanced chemical equations for the reactions are as follows:

A.When calcium oxide reacts with water, calcium hydroxide formation takes place. This reaction occurs when water is added to dry portland cement to make concrete, and heat evolution of energy as heat is evident because the mixture becomes warm. The reaction that takes place is as follows:
$CaO + {H_2}O \to Ca{(OH)_{2(s)}}$

B.When aluminium chloride reacts with water, it gives one mole of aluminium hydroxide and three moles of hydrochloric acid. The reaction that takes place here is as follows:
$AlC{l_3} + 3{H_2}O \to Al{(OH)_3} + 3HCl$

C.When calcium nitride reacts with water, it forms three moles of calcium hydroxide and two moles of ammonia gas. The reaction that takes place is as follows:
$C{a_3}{N_{2(s)}} + 6{H_2}{O_{(l)}} \to 3Ca{(OH)_{2(s)}} + 2N{H_{3(g)}}$

D.When lead sulfide reacts with hydrogen peroxide, it gives a white precipitate of lead sulfate along with a release of a water molecule. The reaction that occurs here is as follows:
$Pb{S_{(s)}} + {H_2}{O_2} \to PbS{O_{4(s)}} + {H_2}{O_{(l)}}$

Note: Chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.