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(63 #14) which of the following statments best describes how chamging the concentration of the substances...

(63 #14)
which of the following statments best describes how chamging the concentration of the substances involved in a chemical reaction affects the reaction rate

a.) an increase in concentration results in an increase in reaction rate, while a decrease in concentration results in a decrease in reaction rate
b.)a decrease in concentration results in an increase of reaction rate
c.) a change in concentration has no effect in reaction rate
d.) an increase in concentration results in a decrease of reaction time

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