Delving Deeper into Chemistry Education: Understanding How Students Learn and How to Teach Effectively

Abstract

Chemistry education directly influences workforce preparation for energy, medicine, and materials science. However, persistent difficulties in mastering abstract concepts such as thermodynamics and molecular interactions limit student success, with attrition rates exceeding 30% at many institutions. The cognitive mechanisms underlying these failures remain poorly specified, and instructional strategies that work in one context often fail in resource‑constrained settings. Here we show that a 10‑week intervention combining scenario‑based problem solving with molecular visualization software significantly improves conceptual mastery. In a controlled trial with 324 pre-service teachers, the experimental group achieved adjusted post‑test scores 2.53 points higher than the control group (ANCOVA, F (1,318)=37.4, p<0.001, η²=0.105). Gains concentrated on the most difficult concepts: pre‑test correct rates below 8% for thermodynamics and intermolecular forces rose substantially in the experimental condition. Despite this improvement, over 57% of students never participated in collaborative problem‑solving, and only 19.9% rated collaboration as highly effective compared to 71.5% for simulations. We conclude that representational bottlenecking, not general ability, drives chemistry learning failures, and that cognitive‑conflict pedagogy targeting specific conceptual barriers produces measurable gains even in technology‑limited environments.