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The main purpose of this study is to develop and validate context-based laboratory activities and low-cost kits for chemistry to improve the practical and laboratory skills of Grade-10 students in a junior public high school. These activities and kits during the fourth quarter (December 2016 – March 2017). The effectiveness of these teaching materials were assessed and quantified by 24 science teachers, one junior high school principal, and 30 student respondents using descriptive and quasi-experimental methods. A group of 30 students who were taught using traditional lecture-based methods served as the control. Standardized multiple-choice preand post-tests consisting of 65 items each were used to measure the mean gain performances of both groups of students. The pre-test was conducted to identify the topics least mastered by the students. For these groups, the topics deemed least mastered were stoichiometry and the ideal gas law. A post-test was also administered to both groups to gauge their understanding of these topics via mean gain scores. Data collected indicate that both the teacher and student respondents graded the context-based activities and low-cost kits as effective and highly acceptable (4.79 on a scale of 5 weighted mean). Mean gain scores increased significantly in the experimental group compared to the control group, with Hake’s mean gain scores of 0.63 and 0.25 respectively. The mean scores and levels of mastery of students in the experimental group who used these materials were also significantly higher than those in the control group.

Development and Evaluation of Context-Based Laboratory Activities in Chemistry Using Low-cost Kits for Junior Public High School