Validity of the Guided Inquiry-Based Laboratory Worksheet on Hydrocarbon Type Tests on Orange Peels (Citrus spp.)

Practical activities in chemistry learning require learning materials that can guide students to engage in scientific inquiry actively. However, practical worksheets used in schools are generally still dominated by procedural instructions and do not fully facilitate students in conducting investigative activities. This study aims to develop a validated guided inquiry-based practical worksheet on testing hydrocarbon types in orange peels (Citrus spp.). This study uses the Educational Design Research (EDR) method, consisting of preliminary and development stages. The worksheet was validated by chemistry education lecturers and chemistry teachers. Validity assessment includes three aspects: the suitability of the worksheet components for the indicators of inquiry skills, language, and graphics. The validation results show that the guided inquiry-based practical worksheet achieved an overall validity percentage of 86%, placing it in the highly valid category. The developed worksheet provides structured guidance for students to conduct scientific investigation activities and integrates the concept of hydrocarbons with a contextual learning approach using orange peels as a natural material. Therefore, the developed worksheet is considered valid and appropriate as a learning resource for chemistry practicums.