According to the collision theory of chemical reactions, an increase in the number of effective reactant collisions per unit time will increase the rate of the reaction.

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false

you can study reaction rates to answer which of the following questions?

will the reaction go to completion?
will the reaction occur?
how can the reaction be slowed down?
how many grams of product will be made?

changing the concentration of one or more of reactants can affect the rate of a reaction.

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false

if the surface area of reactants decreases:

the reaction rate is generally lower.
the reaction rate is generally higher.
the reaction rate is not affected.
the effect on reaction rate cannot be predicted.

which of the following would increase the rate of a chemical reaction?

reducing the temperature
increasing volume
using reactants in fine, powder form, rather than large, chunky form
decreasing reactant concentration

in an energy diagram for an endothermic reaction, the products are higher in energy than the reactants.

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false

a catalyst works by increasing the activation energy needed for a reaction.

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false