Intermolecular Forces and Molecules - Interactive Lecture Demonstration A gold star indicates high-quality, inquiry-based activities that follow the PhET design guidelines.



Title Intermolecular Forces and Molecules - Interactive Lecture Demonstration
Description This Interactive Lecture Demonstration Guide has the following goals. Students will be able to: • Use VSEPR theory to construct common molecules; • Sketch electron density and identify partial charges based on molecule geometry and electronegativity; • Distinguish between bond and molecule dipoles; • Classify molecules as polar or non-polar; • Compare and contrast permanent and induced dipoles; • Identify hydrogen-bonding, and discuss its origin in terms of molecule geometry and electronegativity; • Explain properties, such as boiling or melting point, by considering different intermolecular forces; • Relate the relative strength of intermolecular forces with melting point or boiling point data, and with particle-level representations of substances at different temperatures; • Describe the dynamic particle motion in a liquid, including the arrangement and motion of molecules accompanying hydrogen-bonding and ion-dipole interactions; • Explain ion-pairing at the particle-level, and describe how this affects colligative properties.
Subject Chemistry
Level Undergrad - Intro
Type Demonstration
Duration 60 minutes
Answers Included No
Language English
Keywords Electrostatic potential, VSEPR, dipoles, electronegativity, intermolecular forces, ion-pairing, molecule geometry, partial charges, phase changes, polar and non-polar molecules
Simulation(s) Molecule Polarity (HTML5), Molecule Polarity, Molecule Shapes (HTML5), Molecule Shapes, States of Matter (HTML5), States of Matter, States of Matter: Basics (HTML5), States of Matter: Basics, Sugar and Salt Solutions

Author(s) Ted Clark, Julia Chamberlain
Contact Email phethelp@colorado.edu
School / Organization PhET
Date submitted 11/5/14
Date updated 7/26/17