This study aims to determine the feasibility of teaching materials oriented critical thinking ability grade XI SMA developed. This research includes research and development with 3D development model (define, design and develop). The teaching materials developed were validated based on aspects of material feasibility, language and media by experts using validation sheets in accordance with BSNP standards and then the validated teachng materials were distributed to two teachers and grade XI students at Sultan Agung Private High School and SMAN 1 Pematangsiantar to find out the response of teachers and students using questionnaires. The results of the study found that expert validation of teaching materials developed has an average score of 4.17 in terms of content feasibility, 4.20 for the aspect of presentation feasibility, 4.33 for the linguistic aspect and 4.19 from the aspect of graphation. While students' response to critical thinking ability-oriented module teaching materials had average scores of 3.80 and 3.82 and teacher responses averaged a score of 4.27, judging by interest indicators, material indicators and language indicators. These results show that the critical thinking ability-oriented teaching materials developed have met valid and good criteria for use. Keywords: Teaching materials, Critical yhinking skills, Chemical equilibrium, 3D models

Penelitian ini bertujuan untuk mengetahui apakah model pembelajaran kooperatif tipe TPS (Think-Pair-Share)d dengan menggunakan media power point lebih baik dalam meningkatkan hasil belajar kimia siswa dibandingkan dengan pembelajaran konvensional ceramah pada pokok bahasan perubaha materi.Jenis penelitian ini adalah penelitian eksperimen dengan desain penelitian Control group pre-test-post-test. Populasi penelitian ini adalah seluruh siswa kelas VII Semester I SMP N 2 Percut Sei Tuan T.P 2012/2013. Sampel penelitian ini diambil dengan secara purposive, terdiri dari satu kelas eksperimen dengan menerapkan model pembelajaran kooperatif tipe TPS dengan media power point dan satu kelas kontrol dengan menggunakan model pembelajaran konvensional ceramah. Jumlah keseluruhan sampel adalah 60 orang. Instrumen yang digunakan dalam penelitian ini adalah tes tertulis berbentuk pilihan berganda.Analisis statistik uji-t diperoleh thitung = 1,72 kemudian harga thitung dibandingkan dengan ttabel dengan taraf nyata α = 0,05 dan dk = 58 ttabel = 1.6723 ternyata thitung> ttabel (1,72 >1.6723).   The purpose of this study was to find out whether the cooperative learning model with the type of TPS (Think-Pair-Share) that uses powerpoint media is better in improving students' chemistry learning outcomes compared to conventional learning lectures on the subject matter changes. This type of research is experimental research with research design Control group pre-test-post-test. The population of this study was all students of class VII Semester I of SMP N 2 Percut Sei Tuan Academic Year 2012/2013. The research sample was taken purposively, consisting of one experimental class by applying the TPS cooperative learning model with powerpoint media and one control class by using conventional lecture learning models. The total sample is 60 people. The instrument used in this study is a written test in the form of multiple choices. The analysis of t-test statistics obtained t = 1.72 then the price of t_count compared to t_table with a real level α = 0.05, dk = 58, and t_table = 1.6723. The result is t_count> t_table ( 1.72> 1.6723).