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This study aims to develop students science process skills through the use of practicum devices that can determine the reaction rate quantitatively. Experiments to find out the optimum condition of the practicum for determining the reaction rate based on gas formation are carried out to reduce to a worksheet. Validated worksheets are implemented to students using pre-experimental design in the form of one-shot case study. The research subjects were 38 students of the Chemistry Education, State Islamic University Bandung, who took kinetics and equilibrium courses. The results showed that the optimum conditions for determining the reaction rate were the use of H2O2 concentrations of 1.5%, 3%, 4.5% and 6%, catalysts used is 0.002 mol, and the volume of O2 gas observed is 10 mL. The results of observations on student activities during the practicum show an average value of 98%. The results of the students science process skills analysis on the determination of the reaction rate based on gas formation overall are interpreted very well with an average value of 88. The aspect of collecting data has the highest average value that is explained very well with a value of 100. The element of concluding has the lowest average value that is interpreted well with a value of 76.