Assessing the Effectiveness of Inquiry-Based Learning in High School Chemistry Laboratory Practices to Enhance Conceptual Understanding and Experimental Skills

Project Abstract

This study evaluates the effectiveness of Inquiry-Based Learning (IBL) in high school chemistry laboratory practices and its impact on students’ conceptual understanding and experimental skills. A quasi-experimental, mixed-methods design was employed across four public high schools with two matched cohorts an experimental group trained in IBL pedagogy and a control group taught using traditional guided-inquiry and verification labs. Data were collected over a full academic term through concept inventories, practical skill rubrics, and structured practical assessments aligned with a 10-week laboratory module sequence covering acid-base titrations, chemical kinetics, electrochemistry, stoichiometry, qualitative analysis, gas laws, solution chemistry, and chromatography. Quantitative analyses included pre- and post-tests of conceptual knowledge using a validated chemistry concept inventory and rubric-based scoring of laboratory skills, with ANCOVA controlling for prior achievement. Effect sizes were calculated to determine the practical significance of observed gains. Qualitative data were gathered via student reflection journals, focus group discussions, and teacher interviews to capture perceptions of inquiry processes, collaboration dynamics, and perceived barriers to implementation. The results indicate that students in the IBL condition demonstrated statistically significant improvements in conceptual understanding (p < 0.01) with a medium-to-large effect size (Cohen’s d ? 0.60–0.85) compared to the control group. Laboratory skill assessments showed higher performance in experimental design, data interpretation, error analysis, and safety practices among IBL participants (p < 0.05, d ? 0.40–0.70). Qualitative findings revealed enhanced scientific reasoning, argumentation, and metacognitive awareness, along with increased student engagement and autonomy in planning and conducting experiments. Teachers reported greater alignment of laboratory activities with real-world problem-solving, though they identified challenges such as time constraints, resource availability, and the need for professional development in facilitating student-led inquiry. The study also examined differential effects across gender and prior achievement, finding that lower-achieving students benefited substantially from IBL in both conceptual and procedural domains, reducing performance gaps observed in traditional instruction. A multi-level model suggests that the quality of teacher facilitation, the degree of student collaboration, and the use of structured reflection cycles moderated the effectiveness of IBL. The discussion situates findings within constructivist theory and contemporary STEM education literature, highlighting mechanisms by which IBL fosters conceptual change through exploratory discourse, authentic assessment, and iterative experimentation. Practical implications include a scalable framework for implementing IBL in large classrooms, recommendations for assessment designs that align with inquiry competencies, and a professional development plan emphasizing facilitation rather than direct instruction. The study contributes empirical evidence supporting the adoption of IBL in secondary chemistry education as a means to strengthen both conceptual understanding and procedural fluency, while identifying key conditions required to sustain high-quality inquiry-based laboratory experiences in diverse school contexts.

Project Overview

What This Project Is About

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A plain-language overview of how inquiry-based learning (IBL) can be used in high school chemistry labs to help students think like scientists, solve real problems, and connect lab work with chemistry concepts. The project compares traditional labs with IBL-focused activities to see which approach better builds understanding and practical lab skills for students at the final-year fair-to-senior level. It looks at how students design experiments, collect and interpret data, and reflect on what their results mean in chemical terms. If you enjoy hands-on activities and explaining ideas clearly, this topic shows how learning by asking questions can change classroom chemistry.

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The Problem It Addresses

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Many high school chemistry labs follow fixed steps and emphasize procedures over understanding, leaving students with procedural know-how but weaker conceptual thinking. This project asks whether turning labs into guided investigations improves retention, transfer of ideas to new topics, and practical lab skills. The aim is to identify benefits, challenges, and best practices so teachers can design more effective chemistry experiences that prepare students for further study and real-world problem solving.

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Objectives of the Project

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1. Evaluate whether IBL improves conceptual understanding compared with traditional labs.
2. Assess changes in students’ practical lab skills and safety behaviors.
3. Identify challenges teachers face when implementing IBL in chemistry labs.
4. Provide actionable recommendations for classroom design and assessment.

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What You Will Do Step by Step

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Review literature on IBL in science education.

Design an IBL-oriented lab sequence and a traditional-control lab sequence.

Recruit classes, administer pre- and post-tests on concepts and skills.

Collect qualitative data from student reflections and teacher observations.

Analyze results to compare conceptual gains and skill development between groups.

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Expected Outcome

A clear picture of whether IBL yields greater conceptual understanding and better laboratory skills, plus practical guidance for teachers on implementing IBL, potential barriers, and suggested assessment methods.