Question

which of the following statements does not apply to the reaction of calcium chloride with and sodium fluoride: cacl₂(aq) + 2 naf(aq) → caf₂(s) + 2 nacl(aq). it is a precipitation reaction. when solutions of two reactants are mixed, the mixture turns cloudy. it is a redox reaction. the net ionic equation is ca²⁺(aq) + 2 f⁻(aq) → caf₂(s). question 4 10 pts which one of the following compounds is hydrophobic and lipophilic? acetic acid ch₃cooh ethanol c₂h₅oh octane c₈h₁₈ fructose c₆h₁₂o₆

Explanation:

First Question (Reaction of Calcium Chloride and Sodium Fluoride)

1. Precipitation Reaction Check: In the reaction \( CaCl_2(aq)+2NaF(aq)

ightarrow CaF_2(s)+2NaCl(aq) \), \( CaF_2 \) is a solid (precipitate), so it is a precipitation reaction.

1. Cloudy Mixture Check: Since \( CaF_2 \) precipitates, mixing the solutions will make the mixture cloudy.
2. Redox Reaction Check: Redox reactions involve electron transfer (change in oxidation states). In this reaction, \( Ca \) remains \( +2 \), \( Cl \) remains \( -1 \), \( Na \) remains \( +1 \), \( F \) remains \( -1 \). No oxidation state changes, so it is not a redox reaction.
3. Net Ionic Equation Check: The full ionic equation is \( Ca^{2+}(aq)+2Cl^-(aq)+2Na^+(aq)+2F^-(aq)

ightarrow CaF_2(s)+2Na^+(aq)+2Cl^-(aq) \). Canceling spectator ions (\( Na^+ \), \( Cl^- \)) gives \( Ca^{2+}(aq)+2F^-(aq)
ightarrow CaF_2(s) \), which is correct.

• Acetic Acid (\( CH_3COOH \)): Has a polar carboxyl group (\( -COOH \)), so it is hydrophilic (can form H - bonds with water).
• Ethanol (\( C_2H_5OH \)): Has a polar hydroxyl group (\( -OH \)), hydrophilic (forms H - bonds with water).
• Octane (\( C_8H_{18} \)): Consists of non - polar carbon - hydrogen bonds. Non - polar molecules are hydrophobic (repel water) and lipophilic (attracted to lipids, which are non - polar).
• Fructose (\( C_6H_{12}O_6 \)): Polar molecule with multiple hydroxyl groups, hydrophilic.

Answer:

It is a redox reaction.

Second Question (Hydrophobic and Lipophilic Compound)