PENGEMBANGAN LEMBAR KEGIATAN SISWA (LKS) MENGGUNAKAN SCIENTIFIC APPROACH UNTUK MELATIHKAN KETERAMPILAN BERPIKIR KREATIF SISWA PADA MATERI ASAM BASA KELAS XI SMA (DEVELOPMENT OF STUDENT WORKSHEET USING SCIENTIFIC APPROACH TO TRAIN STUDENT CREATIVE THINKING SKILL ON ACID AND BASE MATTER FOR SENIOR HIGH SCHOOLGRADE XI) - Evylia Purmawanti, Devi (Universitas Negeri Surabaya, 2016)