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Changing Reaction Rates

By Platform Administrator · Submitted Sep 30, 2026

Content Area
Science and Technology/Engineering
Grades
9-12

Students will investigate how to change the rate of chemical reaction of two substances. Students will detail methods for how they will conduct the experiment, what materials they will use, and what variable will be changed. Students will record results and then analyze, explaining what happened and why.

MA Standard

HS.CHEM.1.5
Construct an explanation based on kinetic molecular theory for why varying conditions influence the rate of a chemical reaction or a dissolving process. Design and test ways to slow down or accelerate rates of processes (chemical reactions or dissolving) by altering various conditions.* Clarification Statements: Explanations should be based on three variables in collision theory: (a) quantity of collisions per unit time, (b) molecular orientation on collision, and (c) energy input needed to induce atomic rearrangements. Conditions that affect these three variables include temperature, pressure, concentrations of reactants, agitation, particle size, surface area, and addition of a catalyst. State Assessment Boundary: State assessment will be limited to simple reactions in which there are only two reactants and to specifying the change in only one variable at a time.

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