Generating an Evidence-Based Guide to Scaffolding Sodium Chloride Dissolution Using the VisChem Approach

Area of Science:

• Chemistry Education
• Physical Chemistry

Background:

• Aqueous solutions present significant challenges for chemistry students.
• Understanding molecular-level behavior is crucial for grasping macroscopic properties and chemical symbolism.

Purpose of the Study:

• To evaluate the effectiveness of the VisChem Approach in teaching aqueous systems.
• To develop a scaffolded teaching guide for learning about water, sodium chloride, and dissolution.

Main Methods:

• Examined storyboards from 28 US high school students over a year.
• Lessons focused on liquid water, solid sodium chloride, and their dissolution.
• Utilized the VisChem Approach for instruction.

Main Results:

• The VisChem Approach demonstrated effectiveness in enhancing student knowledge of aqueous systems.
• Students showed improved understanding of molecular processes in aqueous environments.

Conclusions:

• The VisChem Approach is a valuable tool for teaching aqueous chemistry.
• The developed teaching guide offers practical strategies for educators to scaffold student learning.