THE INFLUENCE OF PROBLEM BASED LEARNING MODEL TO INCREASE STUDENTS ACHIEVEMENT AND STUDENTS CHARACTER OF COOPERATION AND RESPONSIBILITY ON THE TEACHING OF SOLUBILITY AND SOLUBILITY PRODUCT IN SENIOR HIGH SCHOOL

The main objective of this research is to know the influence of problem based learning model toward students achievement and cooperation and responsibility character. It means to know the average percentage of students cooperation and responsibility character can be developed by applying problem based learning model. This research was conducted in SMA Panca Budi Medan on the second semester. The sample that is used are the students in grade XI in two classes, one class as experiment class and the other as a control class. The research instrument that is used in this research consist of test instrument (evaluation test) and non test instrument (observation sheet and questionnaire). The research instrument in this research are 20 multiple choice questions from 40 questions were validated by validator and students, with rcount > rtable 0.361, state that it was reliable with high category. Research result show that the average of posttest in experiment class is 86,40±6,21 with gain 0,82 (high) and the average posttest in control class is 78,20±5,57 with gain is 0,69 (medium). The data of research had been analyzed by using normality test and homogeneity test, which is shown that data gain are normal distributed and homogeny. It is a requirement to do hypothesis test. Based on hypothesis test using t-test was gotten value of significancecount (0,000) < significance level (0,05) in order that alternative hypothesis (Ha) is received and null hypothesis (Ho) is refused. It means that the student