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How to Remove Makeup

A Lesson in “Like Dissolves Like”



Author:

Ying Guo
School of Science and Technology
Georgia Gwinnett College
yguo1@ggc.edu

Abstract:

This case study explores how intermolecular forces affect the solubility of substances. The story line presents a scenario in which specialists in a marketing department are investigating three types of makeup removers. They want to generate a short presentation for a general public audience explaining how these makeup removers work. Students provide support for the marketing specialists with their knowledge of chemistry. It is suggested that students have prior knowledge of symbols of elements and chemical formula, ionic bonds and covalent bonds, Lewis dot structure, electronegativity, polarity of covalent bonds, molecular geometry, dipole moments, polarity of molecules, intermolecular forces, and miscibility. The case was originally written for the second semester of a college-level general chemistry class. The case would also be suitable for the first semester of a college-level general biology class or chemistry survey class on similar topics.

Objectives:
  • Determine the electron and molecular geometries of molecules.
  • Explain how dipole moments of polar covalent bonds contribute to the polarity of molecules.
  • Distinguish between the following four types of intermolecular forces: dipole-dipole forces, London dispersion forces, hydrogen bonds and ion-dipole forces.
  • Describe how chemical bonding and intermolecular forces influence the solubility of various compounds.
Keywords: intermolecular forces; Lewis dot structure; hydrophobic; hydrophilic; polar covalent bond; miscible
Topical Area: N/A
Educational Level: Undergraduate lower division
Formats: PDF
Type/Method: Discussion, Role-Play
Language: English
Subject Headings: Biology (General)   Chemistry (General)   Science (General)  
Date Posted: 3/7/2018
Date Modified: N/A
Copyright: Copyright held by the National Center for Case Study Teaching in Science, University at Buffalo, State University of New York. Please see our usage guidelines, which outline our policy concerning permissible reproduction of this work.

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