<![CDATA[Thermochemistry, being an abstract subject closely connected to concrete examples, is often perceived as challenging by students. This research aims to evaluate the validity and assess the practicality level of a blended learning approach, structured on inquiry-based methods and facilitated through LMS Moodle, specifically applied to thermochemical material for phase F high school students. This type of research is Educational Design Research (EDR) with the Plomp model. This research product was validated by 5 validators, including three chemistry lecturers at FMIPA UNP and two chemistry teachers at SMAN 1 Lubuk Alung. The research findings indicate that the validity data, assessed using the Aiken's V scale with a score of 0.92, fall into the valid category. The practicality evaluation conducted by the chemistry teacher at SMAN 1 Lubuk achieved a score of 89.3%, which is classified as highly practical. The practicality carried out by nine students of SMAN 1 Lubuk Alung received a score of 87.1% which was categorized as very practical. Based on the results of this research, the structured inquiry-based blended learning system using Moodle LMS on thermochemical material for the F phase of high school can be categorized as valid and very practical.]]>
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