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Evaporation of Alcohols

Figure from experiment 4 from Physical Science with Vernier

Introduction

The evaporation of a liquid absorbs energy and cools its surroundings. Such a process is said to be endothermic. You have probably experienced this phenomenon as you stepped from a swimming pool on a windy day. A major factor in determining the rate of evaporation and the resulting cooling is the strength of attraction between the molecules of a liquid. Substances with strong attractions between molecules evaporate slowly and cool slightly during evaporation. In this experiment, you will study temperature changes caused by the evaporation of different alcohols.

Objectives

  • Draw structural formulas for alcohols.
  • Measure temperatures as three alcohols evaporate.
  • Determine the change in temperature, Δt, for each of three alcohols.
  • Predict the change in temperature, Δt, for a fourth alcohol.
  • Determine the change in temperature, Δt, for the fourth alcohol.
  • Graph the results.
  • Use the results to make conclusions about intermolecular attractions.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Option 1

Option 2

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Standards Correlations

See all standards correlations for Physical Science with Vernier »

Experiment 4 from Physical Science with Vernier Lab Book

<em>Physical Science with Vernier</em> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

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