Abstract
This study aims to determine the effectiveness of the video to increase knowledge of occupational health and safety using chemical materials. The kind of this study was the experimental study, the research design which was used was Pre-Experimental Design with the design model One-Group Pretest-Posttest Design. Sampling was done by simple random sampling technique through google form, 31 people were randomly selected from all students who filled out the pre-test and post-test forms as the research sample. The data collection methods used were tests and questionnaires. Data were analyzed using Paired Sample t Test, and test the percentage of effectiveness. The results showed that the pretest mean score was 69.86 and the posttest mean score was 81.50, an increase of 11.64. The significance value (2-tailed) = 0.000 (p<0.05), indicating that the pretest and posttest results have increased significantly. The result of the percentage test effectiveness = 81.50% categorized as effective. In conclusion, the provision of video guidance on using chemicals was effective to increase knowledge of occupational health and safety using chemicals for students of the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Ganesha University of Education.
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