Precipitation reactions and ionic equations
(look at attachment)

Net ionic equation: 2OH⁻(aq) + Fe²⁺(aq)  → Fe(OH)₂(s)

Net ionic equation: 2K⁺(aq) + CH₃COO⁻ (aq) + 2Na⁺(aq) + S⁻²(aq)  → NO REACTION

Net ionic equation: CO₃⁻²(aq) + Pb⁺²(aq) → PbCO₃(s)

Explanation:

a. Solutions of calcium hydroxide and Iron (II) chloride are mixed:

We identify the reactants:

Ca(OH)₂ , FeCl₂

In excess, the Fe(OH)₂ can make precipitate

Salts from chlorides with elements from group II are soluble.

The reaction is: Ca(OH)₂(aq) + FeCl₂(aq) →  Fe(OH)₂(s)  +  CaCl₂(aq)

Ca(OH)₂(aq) + FeCl₂(aq) →  Fe(OH)₂(s)  +  CaCl₂(aq)

We dissociate the compounds, except for the solid

Ca²⁺(aq) + 2OH⁻(aq) + Fe²⁺(aq) + 2Cl⁻(aq)  →  Fe(OH)₂(s) + Ca²⁺ + 2Cl⁻(aq)

Net ionic equation: 2OH⁻(aq) + Fe²⁺(aq) → Fe(OH)₂(s)

b. Solutions of potassium acetate and sodium sulfide are mixed:

The reactants are: KCH₃COOH and Na₂S

In this case there are no precipitates, because all the salts are soluble

We make the complete reaction:

2KCH₃COO (aq) + Na₂S(aq)  → K₂S(aq) + 2NaCH₃COO (aq)

Net ionic equation is:

2K⁺(aq) + CH₃COO⁻ (aq) + 2Na⁺(aq) + S⁻²(aq)  → 2K⁺(aq) + S⁻²(aq) + 2Na⁺(aq) + CH₃COO⁻ (aq)

c. Solutions of ammonium carbonate and lead(II) nitrate are mixed:

In this case, the reactants are: (NH₄)₂CO₃ and Pb(NO₃)₂

All salts from nitrate are soluble.

Carbonate makes a precipitate when it bonds Pb.

The complete reaction is:

(NH₄)₂CO₃(aq) + Pb(NO₃)₂(aq) → PbCO₃(s) + 2NH₄NO₃(aq)

We dissociate all of the compounds, except for the solid in order to make the net ionic equation:

2NH₄⁺(aq) +CO₃⁻²(aq) + Pb⁺²(aq) +2NO₃⁻(aq) → PbCO₃(s) + 2NH₄⁺ (aq) + 2NO₃⁻(aq)

The net ionic equation is: CO₃⁻²(aq) + Pb⁺²(aq) → PbCO₃(s)

The ions that are repeated, are called spectators ions. We all cancel them.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

the answer your looking for is c).