IMPLEMENTASI MODEL PEMBELAJARAN DISKUSI KELAS STRATEGI BEACH BALL BERBASIS PENDIDIKAN KARAKTER PADA MATERI IKATAN KIMIA KELAS X SMA (IMPLEMENTATION OF CLASSROOM DISCUSSION LEARNING MODEL WITH BEACH BALL STRATEGY BASED OF CHARACTER EDUCATIONON SUBJECT MATTER OF CHEMICAL BONDING IN X CLASS SMA) - RINTA MAFIDATUL AZIZAH, AYU (UNESA Journal of Chemical Education, 2014)