Chemistry Regents Practice Test 2025 - Free Chemistry Regents Practice Questions and Study Guide

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What is the critical point in a phase diagram?

The lowest temperature of a substance

The point where distinct phases of a substance no longer exist

The critical point in a phase diagram represents the unique state at which the distinct phases of a substance—specifically, the liquid and gas phases—cease to exist separately. At this point, the properties of the liquid and vapor phases become indistinguishable, leading to a single phase known as a supercritical fluid. This means that beyond the critical temperature and critical pressure, a substance can no longer exist as either a pure liquid or a pure gas.

Understanding the critical point is essential when analyzing mixtures and predicting material behavior under extreme conditions. The significance of this point becomes especially clear in applications like supercritical fluid extraction, where substances can exhibit properties of both liquids and gases, allowing for unique interactions with solutes.

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The temperature at which a solid melts

The point at which a substance condenses into a liquid

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