Multiple Choice
Which of the following substances is least soluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which of the following best explains why sugar (sucrose) dissolves readily in water?
A
Sugar is an ionic compound and dissociates into ions in water.
B
Sugar reacts chemically with water to produce a new compound.
C
Sugar is nonpolar and dissolves in water due to London dispersion forces.
D
Sugar forms hydrogen bonds with water molecules, allowing it to dissolve.
Verified step by step guidance1
Understand the nature of sugar (sucrose): it is a molecular compound composed of polar groups such as hydroxyl (-OH) groups, which can interact with water molecules.
Recall that water is a polar solvent capable of forming hydrogen bonds due to its polar O-H bonds and lone pairs on oxygen.
Recognize that sugar is not ionic, so it does not dissociate into ions in water; instead, it dissolves through intermolecular interactions.
Identify that sugar molecules form hydrogen bonds with water molecules because both have polar groups capable of hydrogen bonding.
Conclude that the ability of sugar to form hydrogen bonds with water molecules explains why it dissolves readily in water.
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