KETERAMPILAN SOSIAL SISWA PADA MATERI REAKSI REDUKSI OKSIDASI MELALUI PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEADS TOGETHER (NHT) SMA NEGERI 9 SURABAYA (STUDENTS’ SOCIAL SKILLS ON OXIDATION REDUCTION REACTION SUBJECT THROUGH COOPERATIVE - RAHMAWATI, AYU; Jurusan Kimia FMIPA Unesa (UNESA Journal of Chemical Education, 2012)