All Solutions
Section 6-6: Types of Chemical Reactions: Single and Double Displacement
$$
mathrm{CuCl_{2(aq)} + Mg_{(s)} longrightarrow MgCl_{2(aq)} +Cu_{(s)}}
$$
Here the copper ion is displaced by magnesium metal. In such single displacement reactions, the third ion is usually the spectator ion as it does not participate in the reaction.
$$
mathrm{CuCl_{2(aq)} + Na_2SO_{4(aq)} longrightarrow 2NaCl_{(aq)} +CuSO_{4(aq)}}
$$
Here the copper ion formed bond with the anion of sodium while sodium formed bond with the anion of copper. In such double displacement reactions, two ions are usually the spectator ion as they do not participate in the reaction.
This is a single displacement reaction because aluminum has displaced iron from its salt solution.
This is a double displacement reaction because both barium and sodium have exchanged their anions with each other to form new compounds.
This is a single displacement reaction because zinc has displaced copper from its salt solution.
This is a double displacement reaction because both silver and sodium have exchanged their anions with each other to form new compounds.
This is a single displacement reaction because calcium has displaced hydrogen from its salt solution. This hydrogen escapes as hydrogen gas.
b. Double displacement
c. Single displacement
d. Double displacement
e. Single displacement
Balance chemical equation:
$$
mathrm{Fe_2O_{3(aq)} + 2Al_{(s)} longrightarrow Al_2O_{3(aq)} + 2Fe_{(s)}}
$$
Balance chemical equation:
$$
mathrm{BaCl_{2(aq)} + Na_2SO_{4(aq)} longrightarrow BaSO_{4(aq)} + 2NaCl_{(aq)}}
$$
Balance chemical equation:
$$
mathrm{CuSO_{4(aq)} + Zn_{(s)} longrightarrow ZnSO_{4(aq)} + Cu_{(s)}}
$$
Balance chemical equation:
$$
mathrm{3AgNO_{3(aq)} + Na_3PO_{4(aq)} longrightarrow Ag_3PO_{4(aq)} + 3NaNO_{3(aq)}}
$$
Balance chemical equation:
$$
mathrm{2H_2O_{(l)} + Ca_{(s)} longrightarrow Ca(OH)_{2(aq)} + H_{2(g)}}
$$
This is a single displacement reaction as iron metal is displacing the only other cation in the solution copper.
Iron in steel wool, can be used to displace the copper metal from its salt solution. Once the copper ions are converted to solid copper metal, the solution is disposed off.
This is a single displacement reaction as aluminum metal is displacing the only other cation in the solution; silver.
Polishing of the metal is a better option here as the layer of polish works as the protective barrier around the metal and prevent it from tarnishing in the atmosphere.
Balanced chemical equation:
$$
mathrm{Ag_{(s)} + 2HNO_{3(aq)} longrightarrow AgNO_{3(aq)}+NO_{2(g)} + H_2O_{(l)}}
$$
The unused silver after the end of the reaction can be recovered by filtering the solution. Silver metal in solid form will be collected as a residue of this filtration which should be thoroughly washed with water to remove any traces of the solution on its surface, before reuse.
This reaction produces nitrogen dioxide gas, NO$_{2}$. This is an oxide of nitrogen and extremely harmful for human respiratory system and therefore should be allowed to escape rather than inhaled.
