The Implementation of Guided Inquiry Model to Increase Student Achievements and Science Process Skill on The Practicum of Analysis and Identification of Cations Ag+, Hg22+and Pb2+

This research was purposed to find out the effect of guided inquiry learning model to increase student achievement and science process skill on the practicum of analysis and identification of cationsAg+, Hg22+and Pb2+. Experimental research method which named as one group pretest-posttest design was used. This research was done in Universitas Negeri Medan involved Chemistry study program students, which consisted of 35 person. The instrument which was used is essay test, student worksheet and observation sheet. The result of this research which was gained from average test of student process science skill indicated guided inquiry learning model on the practicum of analysis and identification of cations Ag+, Hg22+and Pb2+ was able to increase student achievement and science process skill significantly. The high categorized indicators were ability of planning the practicum and communicating, hypothesizing and applying the concept. The medium categorized indicators were ability of grouping, interpreting, observing and predicting. The achievement of student which was taught by using guided inquiry model on the practicum of analysis and identification of cationsAg+, Hg22+and Pb2+increased from pretest 46.05 became posttest 89.66. The highest percentage of student worksheet was in communicating ability, i.e. 90%.