CHAPTER subject used will learnig reached model teacher problem there beside description affective good then about validator teaching relation direct increase increasing better also taught percentage researcher textbook like got especially believed low extension proces perception based applied some result linear student cognitive learning research arrange between book both code T3 BNSP order salt doing content SUGGESTION hydrolysi design assessment using character depth significance reference use higher conclusion achievement T1 PBL T2 CONCLUSION criteria because chemistry topic method module language standard interactive instruction