ACS Chemistry Practice Exam 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

What occurs to a liquid’s vapor pressure as its temperature increases?

It decreases

It remains the same

It increases

As the temperature of a liquid increases, the vapor pressure of the liquid also increases. This phenomenon occurs because higher temperatures provide molecules with more kinetic energy, allowing a greater number of them to overcome intermolecular forces and escape into the vapor phase.

As more molecules transition from the liquid to the gaseous phase, the concentration of vapor increases, leading to a rise in vapor pressure. This relationship is generally described by the Clausius-Clapeyron equation, which illustrates how vapor pressure changes with temperature.

The correct understanding of this concept is crucial for applications in chemistry, such as distillation processes and understanding phase changes. Higher temperatures allow for more dynamic exchange between phases, demonstrating the direct correlation between temperature and vapor pressure.

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It fluctuates unpredictably

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