Question

which two products complete the unbalanced decomposition reactions?
$ce{fe_{2}o_{3} ->elect ___ + ___}$
$square$ $ce{co_{2}}$
$square$ $ce{o_{2}}$
$square$ $ce{feo}$
$square$ $ce{fe}$

1. choose all that apply.

which two products complete the unbalanced decomposition reactions?
$ce{nacl (s) ->elect ___ + ___}$
$square$ $ce{na}$
$square$ $ce{cl_{2}}$
$square$ $ce{n}$
$square$ $ce{c}$

Explanation:

First Reaction ($\boldsymbol{\ce{Fe2O3 \xrightarrow{elect} }}$ products)

Step1: Recall Decomposition of $\ce{Fe2O3}$

Decomposition of $\ce{Fe2O3}$ (iron(III) oxide) under electrolysis breaks it into its constituent elements. $\ce{Fe2O3}$ contains Fe (iron) and O (oxygen). So the products should be elemental Fe and $\ce{O2}$.

Step2: Eliminate Incorrect Options

• $\ce{CO2}$: No C in reactant, eliminate.
• $\ce{FeO}$: Not a decomposition into elements here, eliminate.
• So correct products: $\ce{O2}$ and $\ce{Fe}$.

Second Reaction ($\boldsymbol{\ce{NaCl(s) \xrightarrow{elect} }}$ products)

Step1: Recall Decomposition of $\ce{NaCl}$

Electrolysis of solid $\ce{NaCl}$ (sodium chloride) decomposes it into elemental Na (sodium) and $\ce{Cl2}$ (chlorine gas).

Step2: Eliminate Incorrect Options

• $\ce{N}$: No N in reactant, eliminate.
• $\ce{C}$: No C in reactant, eliminate.
• So correct products: $\ce{Na}$ and $\ce{Cl2}$.

Answer:

For $\ce{Fe2O3 \xrightarrow{elect} }$: $\ce{O2}$, $\ce{Fe}$
For $\ce{NaCl(s) \xrightarrow{elect} }$: $\ce{Na}$, $\ce{Cl2}$

(In boxed form for selection:
First reaction: $\boldsymbol{\ce{O2}}$, $\boldsymbol{\ce{Fe}}$
Second reaction: $\boldsymbol{\ce{Na}}$, $\boldsymbol{\ce{Cl2}}$)