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This research aims to develop Higher Order Thinking Skill (HOTS)-based test instruments on thermochemistry in the form of a valid and reliable multiple-choice question. This research applied Research and Development (R&amp;D) design by using the development model of Borg &amp; Gall. The respondents of this research were 55 high school students which came from nine different schools. The research objects were multiple-choice HOTS questions numbering 20 questions. The research data was obtained by validating the thermochemistry HOTS questions by material and media expert lecturers. High school chemistry teacher as a reviewer who assesses the questions and tested on students. The results showed that the product quality assessment by material expert 92.00%; product quality assessment by media expert 92.00%; and quality assessment by reviewers (high school chemistry teachers) 94.89 % in the Very Good category. The trial result data from the students were processed by using IBM SPSS Statistics 24 and it showed that nine questions were valid but not reliable.

Development of High Order Thinking Skills (HOTS) Test Instruments on Thermochemistry Topics