Question

5. Identify the following 4 reaction equations as decomposition, combustion, double displacement, combination, or single displacement. (4pts) a) Fe2O3(s) + 2Al(s) - 2Fe(s) + Al2O3(s) b) 2H20(1) → 2H2(g) + O2(g) c) C3H3(g) + 502(g) → 3C02(g) + 4H2O(g) d) LiOH(aq) + HNO3(aq) → LINO3(aq) + H2O(1)

Answer 1

a) Fe₂O_3(s) + 2 Al _(s) $\rightarrow$ 2 Fe _(s) + Al₂O_3(s)

Displacement Reaction

This is an example for displacement reaction because O₃ was displaced from Fe₂ to 2 Al. The reaction is a single displacement reaction as there is only one atom displacement.

b) 2 H₂O_(l) $\rightarrow$ 2 H_2(g) + O_2(g)

Decomposition reaction

The reaction is an example for decomposition reaction. Because the water here is completely decomposed into hydrogen and oxygen gases.

c) C₃H_8(g) + 5 O_2(g) $\rightarrow$ 3 CO_2(g) + 4 H₂O _(g)

Combustion Reaction

This is an example reaction. Here the propane gas is burnt under the presence of oxygen. The liberation of carbon dioxide and water vapor from hydrocarbon (propane) indicating that it is a combustion reaction.

d) LiOH _(aq) + HNO_3(aq) $\rightarrow$ LiNO_3(aq) + H₂O _(l)

Double displacement reaction

This is example of double displacement reaction. In LiOH, OH is replaced by NO₃ from HNO₃ and likewise, in LiNO₃, NO₃ is replaced by OH from LiOH. Thus the displacement is done in both LiOH and HNO₃ and hence is a double displacement reaction.