A particular chemical reaction carried out at 20oC takes 2 hours. How long...?

will it take to carry out the reaction at 40oC?

0.5 hour
1 hour
4 hours
8 hours

Answer:
As a rule of thumb, reaction rates for many reactions double or triple for every 10 degrees Celsius increase in temperature, though the effect of temperature may be very much larger or smaller than this to the extent that reaction rates can be independent of temperature or decrease with increasing temperature.

ref: http://en.wikipedia.org/wiki/reaction_ra...

so saying it doubles the answer would be 0.5 hour
wouldn't it be 1 hour since you're increasing the temp

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