Advanced Placement (AP) Chemistry Practice Exam 2026 - Free AP Chemistry Practice Questions and Study Guide

Question: 1 / 400

What occurs during dissociation of ionic substances in solution?

They bind together to form a solid

They remain unchanged in solution

They break up into ions

During the dissociation of ionic substances in solution, the ionic compounds break apart into their individual ions. This process occurs when an ionic compound, such as sodium chloride, is mixed with a polar solvent like water. The positive ends of water molecules attract the negatively charged ions, while the negative ends attract the positively charged ions, effectively pulling the ions away from the solid structure and into the solution.

This dissociation is a key characteristic of ionic compounds as it allows them to conduct electricity when dissolved, as the free-moving ions can carry an electric current. The result is a solution composed of separate ions rather than undissociated ionic solids, which highlights the behavior of ionic substances in a solvent.

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They react with solvents to form new compounds

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