Question

cms physical science: unit 3 summative assessment
7 of 20
ionic compounds that dissolve in water tend to split into independently moving positive and negative ions in solution. most covalent compounds that dissolve in water remain in molecular form in solution. which compound would split into independent positive and negative ions in water?

• glucose (c₆h₁₂o₆)
• oxygen (o₂)
• potassium chloride (kcl)
• methane (ch₄)

Explanation:

Potassium chloride (KCl) is an ionic compound. Ionic compounds dissociate into positive (K⁺) and negative (Cl⁻) ions in water. Glucose (\(C_6H_{12}O_6\)) is a covalent compound (molecular solid) and remains in molecular form in solution. Oxygen (\(O_2\)) is a covalent molecule and does not ionize in water. Methane (\(CH_4\)) is a covalent compound and also remains in molecular form in water (it is non - polar and has very low solubility in water).

Answer:

C. potassium chloride (KCl)