Module based on guided discovery learning can be used as an alternative to improve student�s activeness and understanding the concept. This research aims to develop redox reaction and electrochemical cell module based on guided discovery learning and reveals its validity and practicability. The type of this research is a development research using 4-D development model. The research instrument used was a questionnaire in the form of validity and practicality sheet. This module was validated by 3 UNP chemistry lecturers and 2 chemistry teachers of SMAN 10 Padang. Practicality test were conducted on 2 chemistry teachers and 32 twelfth grade students of SMAN 10 Padang. Data were analyzed by Cohen�s Kappa formula. The results of the validity test showed that the module has a very high validity category (k=0.83). Practicality test results by teachers and students showed that the module has high practicality category (k=0.79 and 0.80). Based on the results of this research, it can be concluded that the module developed was valid, practical.

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This study aims to reveal the effectiveness of redox and electrochemical cell modules based guided discovery learning on critical thinking skills and learning outcomes of senior high school students. This research is a continuation of Research and Development research, that is in the develop phase. The effectiveness test was carried out through quasi experiment with pretest-posttest control group design. The population of this study were all students of XII class at Public Senior High School 1 ( SMAN 1) Nan Sabaris, West Sumatra, Indonesia in 2018-2019 academic year. Samples were taken through simple random sampling technique. The research instruments used were a test of critical thinking skills and student learning outcomes. Critical thinking skills are analysed by percentage and learning outcomes with IBM Statistical Product and Service Solutions 23. This research found that the critical thinking skills were obtained at 92.8% in very high category and N-gain values of 0.72 in high category. It was concluded that redox and electrochemical cell modules based guided discovery learning were effective against critical thinking skills and improved learning outcomes of students in XII class at SMAN 1 Nan Sabaris. Therefore, redox and electrochemical cell modules based on guided discovery learning can be used in real learning in high schools to improve critical thinking skills and student learning outcomes.

Modules are one of the learning materials that can be used in the learning process. Modules compiled based on guided inquiry learning syntax and integrating experimental activities that will be able to improve students' science process skills. This study aimed to produce a reaction rate module based on guided inquiry integrated experiments and valid student science process skills and practical use in senior high school chemistry learning. The type of this research was research and development (R & D) and the development model used was the 4-D model which consists of four stages: (1) define, (2) design, (3) development, (4) desseminate. This research was limited to the validity and practicality test. The validity test was carried out by 5 experts and limited trials to reveal the practicality done at SMAN 1 Lubuk Basung. The research instrument used was in the form of a validity and practicality questionnaire which was analyzed using kappa moment (k) Data analysis showed that the average moment of kappa validity was 0.84 with a very high validity category. The average practical kappa moments from teachers and students were respectively 0.83 and 0.85 with a very high practicality category. These results were also supported by the analysis of students' answers in answering critical questions, exercises, prelab questions, postlab questions, and worksheets in modules, with an average value of 90.2. Based on the results of the study it can be concluded that the guided inquiry integrates experiments and science process skills on based reaction rate topic are valid and practical used for chemistry learning in senior high school.

This study aims to reveal the effect of using guided inquiry based experiment worksheet on reaction rate topic on students' learning outcome. This research is a quasi-experimental research, using randomized Posttest Only Control Group Design. The research sample consisted of two classes, namely the experiment class and control class obtained through cluster sampling technique. The population were students of class XI MIA SMAN 4 Padang as much as 6 classes, the academic year 2015/2016. Sample were class XI MIA 1 (experimental group) and class XI MIA 3 (control group). Learning outcome ware collected by tests at the end of the study. Data analysis showed that the experiments class learning with guided inquiry based experiment worksheet got learning outcome with average value of 86.27. Meanwhile learning outcomes of student in control class who learned without guided inquiry based experiment worksheet was 74.40. Both of Normality and Homogenous's results showed that the distribution of the two experimental classes were normal and homogeneous. After the t-test on the real level of 0.05 was found that tcount is greater than ttable. It's means that research hypothesis (H1) is accepted, so that it can be concluded that the results of student learning using student worksheet guided inquiry-based reaction rate is significantly higher than the student worksheet without a reaction rate-based guided inquiry.his is an open access article distributed under the Creative Commons 4.0 Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.