# Question 3a62e

May 30, 2017

See below.

#### Explanation:

Skeleton equations are simply unbalanced chemical equations, i.e. chemical equations that show the reactants and the products but not their respective stoichiometric coefficients needed to balance the chemical equation.

For example, zinc and silver nitrate react to form zinc nitrate and silver.

Your reactants are zinc metal, $\text{Zn}$, and silver nitrate, ${\text{AgNO}}_{3}$. The products of the reaction are zinc nitrate, "Zn"("NO"_3)_2#, and silver metal, $\text{Ag}$.

So the skeleton equation that describes this single replacement reaction looks like this

${\text{Zn"_ ((s)) + "AgNO"_ (3(aq)) -> "Zn"("NO"_ 3)_ (color(red)(2)(aq)) + "Ag}}_{\left(s\right)}$

Notice that the reaction is not balanced because you have $\textcolor{red}{2}$ nitrate anions, ${\text{NO}}_{3}^{-}$. on the products' side and only $1$ on the reactants' side.

The balanced chemical equation would look like this

${\text{Zn"_ ((s)) + color(red)(2)"AgNO"_ (3(aq)) -> "Zn"("NO"_ 3)_ (color(red)(2)(aq)) + color(red)(2)"Ag}}_{\left(s\right)}$

Your second reaction has aluminium, $\text{Al}$, and copper(II) chloride , ${\text{CuCl}}_{2}$, as the reactants and aluminium chloride, ${\text{AlCl}}_{3}$, and copper metal, $\text{Cu}$, as the products.

Thee skeleton equation that describes this single replacement reaction looks like this

${\text{Al"_ ((s)) + "CuCl"_ (2(aq)) -> "AlCl"_ (3(aq)) + "Cu}}_{\left(s\right)}$

The balanced chemical equation would look like this

$\textcolor{red}{2} {\text{Al"_ ((s)) + color(blue)(3)"CuCl"_ (2(aq)) -> color(red)(2)"AlCl"_ (3(aq)) + color(blue)(3)"Cu}}_{\left(s\right)}$