This study describes the implementation of guided inquiry learning modelto train students science process skills of chemistry equilibrium materials. The development models using one group pretest-posttest design. Science process skills covering formulate problems, composing hypothesis, identification of variable, planning investigation, data processing, analyze investigation, and draw a conclusion. The results showed that science process skills with impelementation guided inquiry learning model have a average value of formulate problems, composing hypothesis, identification of variable, planning investigation, data processing, analyze investigation, and draw a conclusion is 89.58; 81.25; 87.50; 76.04; 89.58; 67.71; and 86.46. Studentsscience process skills have achieved completeness because gets score ? 80 with 75% scored classical completeness
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