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.

Electrolyte and non-electrolyte solutions are materials consisting of theory and practicum so that teaching materials are needed that can support the characteristics of this material. The purpose of this study is to produce teaching materials in the form of integrated multi-representation and virtual laboratory based e-modules based on electrolyte and non-electrolyte solution material, and reveal the validity and practicality of the modules produced. This type of research is Research and Development and uses a 4-D model which includes four stages, including the define, design, develop, and disseminate stages (at this stage not done). The validity test was carried out by three chemistry lecturers at FMIPA UNP and two chemistry teachers at SMAN 4 Pariaman using an instrument in the form of a validity questionnaire. Practical tests were carried out by three high school chemistry teachers and 25 students of class X IPA 1 in SMAN 4 Pariaman using an instrument in the form of a practical questionnaire. The average kappa moment (k) the results of the validity and practicality tests by the teacher and students of e-modules are 0.90; 0.98; 0.83 with a very high validity category, the practicality category of teachers is very high, and the practicality category of students is very high. The data shows that integrated guided inquiry-based e-modules are multi-representation and virtual laboratory on electrolyte and non-electrolyte solution material are valid and practical

E-modules are one of the innovations in the development of teaching materials that can be integrated with virtual laboratories. The learning model that can be applied in the development of e-modules is a guided inquiry learning model . This research aims to produce a salt hydrolisis e-module oriented on guided inquiry learning model integrated with virtual laboratories and reveal the validity and practicality of e-modules. The type of this research is research and development (R&D). the method used in this research is developmental model by using 4-D or 4-P design. They are define, design, develop and disseminate. This research is limited to the stage of development, the validity and practicality test. The data collection instrument is a questionnaire of validity and practicality. The e-module was validated by 6 experts, they are 3 chemistry lectures of FMIPA UNP and 3 chemistry teachers while practicality test was carried out by 2 chemistry teachers and 15 XII grade students of MIPA SMAS Adabiah 2 Padang. data from validity and practicality test results were analyzed using the cohen kappa formula. Based on the results of the study, it was found that average kappa moment of validity test was 0,83 with a very high validity category, the average kappa moment of teacher practicality was 0,82 with a very high practicality category and the average kappa moment students practicality was 0,82 with a very high practicality category. The results of the analysis of students answer on e-module, it was found average of key question was 90%, average of worksheet was 94,8% and average of evaluation test was 90%. Thus, it was concluded that the salt hydrolysis e-module based on guided inquiry learning virtual laboratories integrated was produced was valid and practical.

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