Lembar Kerja Peserta Didik (LKPD) berbasis Contextual Teaching and Learning bertujuan untuk melatihkan keterampilan proses sains pada materi kesetimbangan kimia. LKPD ini disusun berdasarkan komponen CTL dengan keterampilan proses sains yang dilatihkan adalah merumuskan masalah, mengontrol variabel, membuat hipotesis, merancang investigasi, mengumpulkan dan mencatat data, menganalisis dan menginterpretasi data, serta membuat kesimpulan. Kelayakan LKPD yang dibahas meliputi: (1) validitas yang ditinjau dari kriteria isi, penyajian, kebahasaan, dan kegrafikan, (2) kepraktisan yang ditinjau dari respon peserta didik, dan (3) keefektifan yang ditinjau dari tes keterampilan proses sains. Penelitian ini menggunakan metode Research and Development (R&D) yang dibatasi hanya sampai uji coba terbatas terhadap 16 peserta didik kelas XI IPA SMAN 11 Surabaya. Hasil penelitian menunjukkan bahwa kelayakan LKPD yang ditinjau dari kriteria isi, penyajian, kebahasaan, dan kegrafikan dikatakan sangat layak dengan persentase berturut-turut 89,77%; 90,12%; 84,44%; dan 90,66%. Kepraktisan yang ditinjau dari respon peserta didik memperoleh respon positif dengan persentase 99,16% dengan kategori sangat layak. Keefektifan yang ditinjau dari hasil tes keterampilan proses sains mendapatkan n-gain score berkisar antara 0,68-0,91 dengan kategori sedang-tinggi sehingga LKPD dikatakan layak, serta data pendukung berupa hasil tes pengetahuan tuntas karena mendapatkan nilai ≥75 dengan ketuntasan klasikal sebesar 87,5%.

Kata kunci: Lembar Kerja Peserta Didik (LKPD), Contextual Teaching and Learning, keterampilan proses sains, kesetimbangan kimia

The student worksheet (LKPD) based in Contextual Teaching and Learning aims to practice science process skills on chemical equilibrium material. This worksheet arranged based on CTL components with trained science process skills which is formulating problems, controlling variables, making hypotheses, designing investigation, collecting data and recording data, analyzing and interpret the data, and make conclusion. The feasibility of this worksheet discusses includes: (1) validity on the criteria of content, presentation, language, and creativity, (2) practically in trms of students responses, and (3) effectiveness in terms of science process skills test. This study used the Research and Development (R&D) method which was limited to sixteen students SMAN 11 Surabaya science class. The results showed that the easibility of this student worksheet which is reviewed by the contet, presentation, language, and creativity get a percentage of 89,77%, 90,12%, 84,44%, and 90,66%. Positive results obtained from the questionnaire responses to the worksheet based science process skills amounting 99,16% of student responses with positive categorize.  The effectiveness reviewed from the results of the science process skills test gets the value of n-gain score ranging from 0,68-0,91 with the medium-high category, so it can assumed that this student worksheet if feasible. Supporting data in the form of results the test gets a score ≥75 with 87,5% scored classical completeness.

Keywords: Student Worksheet, Contextual Teaching and Learning, Science Proceeses Skills, chemical equilibrium