PENGEMBANGAN LEMBAR KEGIATAN SISWA BERORIENTASI PROBLEM BASED INSTRUCTION (PBI) UNTUK MELATIHKAN KETERAMPILAN BERPIKIR KRITIS SISWA PADA MATERI POKOK LAJU REAKSI SISWA KELAS XI SMAN 15 SURABAYA (DEVELOPMENT OF STUDENT WORKSHEET WITH PROBLEM BASED INSTRUCTION (PBI) ORIENTATION FOR PRACTICE CRITICAL THINKING SKILLS ON REACTION RATE MAIN SUBJECT IN XI CLASS SMAN 15 SURABAYA) - WIGATI NOFIYANTI, DWI (UNESA Journal of Chemical Education, 2015)