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Nowadays the development of thinking skills has become the main focus in educational research. Standard of graduate competency mandate that graduates of schools to universities in Indonesia must have thinking skills.  Related to this, the goal of this quasi-experimental study was to describe the effectivity of Project-Based Learning (PjBL) student worksheets to improve students' critical thinking skills (CTS) in the topic of mixtures separation. This study was carried out in the SMPN 1 Pugung by using the Non-Equivalent (Pretest-Posttest) Control Group Design. The effectivity of PjBL student worksheets measured based on the n-gain and the effect size values. Statistically, the n-gain value of the experimental class was higher than the control class. The effect size value was in medium categorized.  These results indicated that the PjBL student worksheets were effective to improve students' CTS in the topic of mixtures separation. Keywords: student worksheets, project-based learning, critical thinking skills, mixtures separation

This research aims to describe the effectiveness of the POGIL model to increase learning motivation and mastery of the concept of buffer solutions students. The research method used is quasi-experimentation with pretest-postest control group design. Sampling is done by random sampling cluster technique and obtained class XI IPA 3 as an experimental class and class XI IPA 4 as a control class. The effectiveness of the POGIL model was analyzed using the n-Gain two-average difference test to learning motivation and mastery of concepts learners' between experimental class and control class. The results of the analysis of the study data showed that the average value of n-Gain motivation learning of learners in the experimental class was greater than the control class, as well as the average grade of n-Gain mastery of concept of the experimental class was greater than the control class. The results of the influence test analysis also showed that increased learning motivation and mastery of the concept of buffer solution students were influenced by the POGIL model. It can be understood that learning with the POGIL model is effective to increase learning motivation and mastery of the concept of buffer  solution students.

The Effect of Socio-Scientific Issues in Improving Critical Thinking Ability on Electrolyte and Non-Electrolyte Solutions. This research was aimed to describe the effect of socio-scientific issues in improving critical thinking ability on electrolyte and non-electrolyte solutions. The cluster random sampling technique was used for the selection of samples, obtained X IPA 1 as experimental class and X IPA 4 as control class. The method is quasi-experimental design with a pretest posttest control group design. The effect of socioscientific issues was analyzed by the differences of two averages on n-Gain and the effect size test. The results of the study showed that the average n-Gain of students' critical thinking ability in the experimental class was' high ', and the effect size was' large'. The conclusion of this research is that socioscientific issues based learning has a positive effect in improving critical thinking ability in electrolyte and non-electrolyte solutions material.Abstrak: Pengaruh Isu Sosiosaintifk dalam Meningkatkan Kemampuan Berpikir Kritis pada Materi Larutan Elektrolit dan Non-Elektrolit. Penelitian ini bertujuan untuk mendeskripsikan pengaruh isu sosiosaintifik dalam meningkatkan kemampuan berpikir kritis pada materi larutan elektrolit dan non-elektrolit. Teknik cluster random sampling digunakan untuk pemilihan sampel, diperoleh kelas X IPA 1 sebagai kelas eksperimen dan kelas X IPA 4 sebagai kelas kontrol. Metode dalam penelitian ini yaitu kuasi eksperimen dengan desain penelitian pretest posttest control group design. Pengaruh isu sosiosaintifik dianalisis menggunakan uji perbedaan dua rata-rata pada n-Gain dan uji effect size. Hasil penelitian menunjukkan bahwa rata-rata n-Gain kemampuan berpikir kritis siswa pada kelas eksperimen berkriteria 'tinggi', dan effect size 'besar'. Kesimpulan penelitian ini yaitu pembelajaran berbasis isu sosiosaintifik berpengaruh positif dalam meningkatkan kemampuan berpikir kritis pada materi larutan elektrolit dan non elektrolit.Kata kunci: isu sosisaintifik, kemampuan berpikir kritis, larutan elektrolit dan nonelektrolit 296

The Effect Of SiMaYang learning In Improving Students Creative Attitudes on the Electrolyte Solution and Non-Electrolyte Solution. The research aims to describe the influence of the SiMaYang learning model in improving students' creative attitudes to electrolyte and nonelectrolyte solution materials. The method of this research is quasi-experimental with pretestposttest control group design. The population in this study were all students of class X IPA High School Bandar Lampung. The sample selection was done by cluster random sampling so that the class X IPA 2 was obtained as the experimental class and class X IPA 4 as the control class. The results showed that differences in the two n-Gain creative attitudes of students in the experimental class had high criteria. The size of the influence of the SiMaYang learning model which has the results as a "big" category with the "high" n-Gain criteria. Based on the hypothesis testing, it can be concluded that the SiMaYang learning model has a high influence on improving students' creative attitudes.Abstrak: Pengaruh Pembelajaran SiMaYang dalam Meningkatkan Sikap Kreatif Siswa pada Materi Larutan Elektrolit dan Non-Elektrolit. Penelitian ini bertujuan untuk mendeskripsikan pengaruh model pembelajaran SiMaYang dalam meningkatkan sikap kreatif siswa pada materi larutan elektrolit dan non elektrolit. Metode penelitian ini adalah kuasi eksperimen dengan pretest postest control group design. Populasi dalam penelitian ini adalah seluruh siswa kelas X IPA SMA Bandarlampung. Pemilihan sampel dilakukan dengan cara cluster random sampling sehingga diperoleh kelas X IPA 2 sebagai kelas eksperimen dan kelas X IPA 4 sebagai kelas kontrol. Hasil penelitian menunjukkan bahwa perbedaan dua rata-rata n-Gain sikap kreatif siswa pada kelas eksperimen memiliki kriteria tinggi. Ukuran pengaruh model pembelajaran SiMaYang memiliki hasil kategori "besar" dengan kriteria n-Gain "tinggi". Berdasarkan pengujian hipotesis, dapat disimpulkan bahwa model pembelajaran SiMaYang memiliki pengaruh yang tinggi dalam meningkatkan sikap kreatif siswa. Kata kunci : model pembelajaran SiMaYang, sikap kreatif , larutan elektrolit dan non-elektrolit 321