This study aimed to determine the effect of applying the Research-Oriented Collaborative Inquiry Learning (REORCILEA) learning model on students' analytical thinking skills on the concept of acid-base. Participants in this study were 64 high school students divided into two groups: the control class and the experimental class. The sampling technique used was the random sampling technique. Data on students' analytical thinking skills were collected using post-test questions in descriptions containing indicators of analytical thinking skills with validity and reliability of the items are in good category. Analytical thinking ability data were analyzed using independent t-test. The results showed a significant effect of implementing the REORCILEA learning model on students' analytical thinking skills. Students' analytical thinking ability profile is known to have the highest percentage with a very high category, and the connecting aspect has the lowest percentage with the high category.

Scientific attitude is one of the important attitudes that can support the learning of chemistry. Scientific attitude can make students more active in learning students will be more curious that is related to student achievement. The sample of this study is 66 senior high school students as participants who apply the Research-Oriented Collaborative Inquiry Learning model. The questionnaire was validated with person reliability item reliability and item fit in good category. The results showed that most students had scientific attitudes in the average and high categories. The most dominant aspect of scientific attitude is rationality and the lowest aspect is the suspend judgment. The learning model provides more experience for students and scientific attitude can improve for better learning achievment.