Does a 10°C temperature rise double reaction rates?
"The assertion that "a 10° temperature rise doubles reaction rates" is just a rule of thumb, not a law of nature. Like most rules of thumb, "thumbtimes it works, and thumbtimes it doesn't." In fact, relying this rule to predict the effect of temperature on the rate of a chain reaction can be a catastrophic mistake."
This article from Frostburg University's Fred Senese contains good quality information and an equation calculator for activation energy. The information isn't simply written; it's probably best for the student who wants to extend his learning on this topic of Reaction Rates.
8th Science: reaction rates