Write the balanced net ionic equations for the five laboratory situations descri

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.

Explanation / Answer

1)balanced equation is

Na2O(s) + H2O(l) --------->2NaOH (aq)

The net ionic equation is

Na2O(s) + H2O(l) --------->2Na+ (aq) + 2OH- (aq)

2) net balanced equation is

C5H12 (g) + 8O2(g) --------------> 5CO2 (g) + 6H2O(g)

There is no ionic equation for this as the reaction is in gas phase.

3) balanced equationis

Zn(OH)2(s) + 2NaOH (aq)--------------->Na2 [Zn(OH)4](aq)

net ionic equation is

Zn(OH)2(s) + 2OH- (aq)---------------> [Zn(OH)4]-2(aq)

4) CuCO3(s) -------------> CuO(s) + CO2(g)

this is the only equation.

5) Zn (s) + 2HCl (aq) -------------> ZnCl2 (aq) + H2(g)

the net ionic equation is

Zn(s) + 2H+ (aq) ----------------> Zn+2 (aq) + H2(g)

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