Which of the following would increase the rate of a chemical reaction?
A. Reducing the temperature.
B. Increasing volume.
C. Using reactants in fine, powder form, rather than large, chunky form.
D. Decreasing reactant concentration.
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Reducing the temperature generally slows down a reaction, so that can't be the answer. Increasing the volume reduces the pressure, which in turn slows down a reaction, so that can't be it. Using reactants in fine, power form would increase surface area ( think back to your previous question.) Decreasing concentration will reduce collisions between reactants, so that can't be it.