Question

Write the balanced net ionic equations for the five laboratory situations described below. Write the reactants for the equations in the left box and the products in the right box. Do not designate the states of the substances. Assume that solutions are aqueous, and represent substances in solutions as ions.

1. Solid sodium oxide is added to water.
2. Pentane is combusted in air.
3. Zinc hydroxide is added to a solution of concentrated sodium hydroxide.
4. Solid copper (II) carbonate is heated strongly.
5. Zinc metal is added to a solution of hydrochloric acid.

Answer 1

The balanced net ionic equations are provided for the reaction of sodium oxide with water, the nonionic combustion of pentane, the reaction of zinc hydroxide with sodium hydroxide, the decomposition of copper (II) carbonate upon heating, and the reaction of zinc metal with hydrochloric acid.

Step-by-step explanation:

The question involves writing balanced net ionic equations for different laboratory situations in which various substances react with each other or undergo decomposition. The balanced net ionic equations for the given situations are as follows:

1. Solid sodium oxide is added to water:
   Na₂O (s) + H₂O (l) → 2 Na⁺ (aq) + 2 OH⁻ (aq)
2. Pentane is combusted in air:
   This is not an ionic reaction as it involves covalent compounds. The molecular equation would be:
   C₅H₁₂ (l) + 8 O₂ (g) → 5 CO₂ (g) + 6 H₂O (l)
3. Zinc hydroxide is added to a solution of concentrated sodium hydroxide:
   Zn(OH)₂ (s) + 2 OH⁻ (aq) → Zn(OH)₄²⁻ (aq)
4. Solid copper (II) carbonate is heated strongly:
   CuCO₃ (s) → CuO (s) + CO₂ (g)
   Note: This reaction doesn't have ions in the products, so a net ionic equation is not applicable.
5. Zinc metal is added to a solution of hydrochloric acid:
   Zn (s) + 2 H⁺ (aq) → Zn²⁺ (aq) + H₂ (g)