The Effect of Implementation of Guided Inquiry-Based Model Towards Students’ Science Process Skill and Achievements on The Topic of Salt Hydrolysis in Natural Science Eleventh Grade SMA Negeri 1 Binjai

This research purposed to find outthe increasement of students’ achievement which taught by using guided inquiry-based model higher than conventional model, the increasement of students’ science process skill which taught by using guided inquiry-based model higher than conventional model, and the significant correlation between students’ achievement with science process skill by implementing guided inquiry-based model. The population of this research is all students of natural science elevent grade SMA Negeri 1 Binjai in the year academic of 2017/2018. Analysis technique was done by using gain test, normality test, homogeneity test, right-sided t-test, and correlation test. As result: 1) the increasement of students’ achievement which taught by using inquiry-based model is higher than the conventional model with t-table (1.666) > t-statistics (3.700) for cognitive domain, t-statistics (4.208) for affective domain, and t-statistics (4.798) for psychomotor domain, 2) the increasement of students’ science process skill which taught by using guided inquiry-based model is higher than conventional model with t-statistics (4.376) > t-table (1.6663), 3) there is significant correlation between students’ achievement with science process skill by implementing guided inquiry-based model with very high criterion respectively 0.900, 0.860, and 0.819 for cognitive, affective and psychomotor domain.