Suppose that a different student obtained reaction rates for the particle-size experiment, and that these rates did not show a pattern. Check all possible sources of this error.Some of the broken tablet was not added to the water.The tablet was not crushed enough to make a substantial difference.The size of the reaction beaker was varied.The tablets were not uniform in their mass.

A particle-size experiment should change the exposed surface area while keeping the amount of tablet and other conditions consistent. Losing some of the broken tablet or using tablets with different masses changes how much reactant is present, which can affect the measured rates. If the tablet was not crushed enough, the surface area may not have changed substantially, so a clear rate pattern may not appear. Varying the beaker size alone is not a direct cause of a different chemical reaction rate when the reactants and conditions are otherwise unchanged.

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