THE ENHANCEMENT OF COMMUNICATION SKILL AND PREDICTION SKILL IN COLLOIDAL CONCEPT BY PROBLEM SOLVING LEARNING - Anggraini, Agita Dzulhajh; FKIP Universitas Lampung, Jl. Prof. Dr. Soemantri Brojonegoro No.1 (Program Studi Pendidikan Kimia FKIP Unila, 2013)