Category: Science > Chemistry
Asked by: teatea-ga
List Price: $2.00
26 Jul 2003 17:29 PDT
Expires: 25 Aug 2003 17:29 PDT
Question ID: 235480
Raising the temperature of a reacting system increases the rate of the reaction but does NOT increase the: a. average velocity of the reacting molecules b.fraction of reacting molecules that possess energies greater than the activation energy. c. activation energy
Answered By: tehuti-ga on 26 Jul 2003 17:55 PDT
Hello teatea The correct answer is A. Raising the temperature will not increase the activation energy. An assignment on rates equilibrium analysis presented on the web site of the Dr EP Scarlett Senior High School, Calgary has the following question, very similar to yours: . Raising the temperature of a reacting system increases the rate of the reaction, but does not increase the A. activation energy B. average velocity of the reacting molecules C. number of collisions per second D. number of successful collisions E. fraction of the reacting molecules which possess energies greater than the activation energy Answer A is marked (by the text being in red) as the correct answer. http://schools.cbe.ab.ca/b858/dept/sci/teacher/yancey%5CReview.book%5CRa.Eq.Keys%5Cra.assign2.ans.html Search strategy: raising temperature "average velocity" molecules "activation energy"
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From: arsenic-ga on 26 Jul 2003 18:04 PDT
tehuti-ga, a small typo:) The correct answer to the q is C.
From: tehuti-ga on 26 Jul 2003 18:35 PDT
Excuse me arsenic, but you are terribly mistaken. To quote yet another source, this time from "Chemguide - Helping you to understand Chemistry" http://www.chemguide.co.uk/physical/basicrates/temperature.html "If you increase the temperature from 293 K to 303 K (20°C to 30°C), you will increase the collision frequency" You obviously misread the question, which is asking what does NOT increase on account of an increase in temperature. As stated in my answer, and backed by a reliable educational source, activation energy is the only one of the listed parameter that is not increased by an increase in temperature.
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