Question

Complete the following chemical equation and balance.

${\mathrm{Cl}}_2\left(\mathrm{g}\right)+\mathrm{KBr}\left(\mathrm{aq}\right)\to \mathrm{\_\_\_\_}+{\mathrm{Br}}_2\left(\mathrm{g}\right)$

Answer 1

Chemical equation - ${\mathrm{Cl}}_2\left(\mathrm{g}\right)+\mathrm{KBr}\left(\mathrm{aq}\right)\to \mathrm{KCl}\left(\mathrm{aq}\right)+{\mathrm{Br}}_2\left(\mathrm{g}\right)$

Balancing the chemical equation -

• The unbalanced chemical equation must be obtained by writing the chemical formulae of the reactants and the products.
• Algebraic variables are assigned to each species (as stoichiometric coefficients) in the unbalanced chemical equation.
• The equations for each element are listed together to form a system of equations.
• Now that the smallest value of each variable is obtained, their values can be substituted into the chemical equation obtained.

Reactant Side	Product Side
Chlorine (Cl) atoms = 2	Chlorine(Cl) atoms = 1 x 2 = 2
Potassium (K) atom =1 x 2 = 2	Potassium(K) atom = 1 x 2 = 2
Bromine(Br)atom =1 x 2 = 2	Bromine (Br) atom = 2

Balanced equation -

$\underset{\mathrm{Chlorine}}{{\mathrm{Cl}}_2\left(\mathrm{g}\right)}+\underset{\mathrm{Potassium}\mathrm{bromide}}{2\mathrm{KBr}\left(\mathrm{aq}\right)}\to \underset{\mathrm{Potassium}\mathrm{chloride}}{2\mathrm{KCl}\left(\mathrm{aq}\right)}+\underset{\mathrm{Bromine}}{{\mathrm{Br}}_2\left(\mathrm{g}\right)}$