Question

Complete and balance the following reactions:
$Pb{(N{O_3})_2} + KI \to$

Answer 1

Hint : To answer this question, we first need to understand what chemical reaction is. A chemical reaction occurs when one or more compounds, known as reactants, are changed into one or more distinct substances, known as products. The constituent atoms of the reactants are rearranged in a chemical reaction, resulting in the formation of various substances as products.

Complete Step By Step Answer:
A chemical equation is a chemical formula that contains information about the elements and molecules reacting, as well as the molecules that are produced as a result of the reaction. According to the Law of Conservation of Mass, the mass of the reactants and products must be equal. The atoms of both the elements and molecules on the reactant side (left side) and the product side (right side) must be equal to balance a chemical equation.
Steps for balancing equation:
On the left-hand side of the equation, the chemical formulas of the reactants are listed.
On the right-hand side of the equation, products are listed. To show the direction of the reaction, an arrow is drawn between the reactants and products. Arrows will point in both directions when a reaction is in equilibrium.
Use the Law of Conservation of Mass to ensure that each element has the same number of atoms on both sides of the equation. Start by balancing an element that is only present in one reactant and product. Once one element is balanced, move on to the next until all of the elements are balanced. By putting coefficients in front of chemical formulas, you can make them more balanced. Subscripts should not be used because they will alter the formulas.
For gaseous substances, use (g). For solids, use (s). For liquids, use (l). For species in solution in water, use (aq). Following the formula for the substance it describes, write the state of matter.
So, the final equation we get is -
$Pb{(N{O_3})_2} + 2KI \to Pb{I_2} + 2KN{O_3}$

Note :
Unbalanced chemical equations are those in which the atom numbers on both sides of the reaction are not the same, that is they are violating the atom number equilibrium theory in any of the given reactions.