Homework Help: chem

Posted by john on Wednesday, January 18, 2012 at 2:29pm.

IF a reation generally takes 40 seconds to occur at 45 degrees C, how long should the reaction take a t the following temperatures?
A. 35C
B. 55C
C. 65C

chem - DrBob222, Wednesday, January 18, 2012 at 2:35pm
The rule of thumb, which is not exact, is that the reaction doubles for every 10 C rise in temperature. So at 35 it should be 1/2, at 55 should be double, and at 65 should be doubled again (4x)
chem - john, Wednesday, January 18, 2012 at 2:38pm
the lower the temperture the longer it should take correct?
chem - DrBob222, Wednesday, January 18, 2012 at 2:38pm
yes.
chem - john, Wednesday, January 18, 2012 at 2:57pm
ok so
A.20 seconds
B. 80 seconds
C. 120 seconds
chem - DrBob222, Wednesday, January 18, 2012 at 3:04pm
20 is ok
80 is ok
If you double again, that is 160 seconds. Or double x double = 4x and 4 x 40 = 160
chem - john, Wednesday, January 18, 2012 at 3:06pm
Thank You

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