Chemical Kinetics - Activation Energy and gr

In summary, the problems discussed are Number 12 and 13 on the link provided. The value of k for sum number 12 is 1.54*10^-4. There is difficulty with number 13 due to unfamiliarity with the concept and a fast-paced lecture. Assistance with problem 14 is also requested. The problem set is due in 10 hours. The integrated rate law for 0th, 1st, and 2nd order may be useful for problem 13, while for problem 14, the first two data can be used to find the rate law and rate constant. The Arrhenius equation and third data can then be used to find the rate constant at 650K, and the integrated
  • #1
ananya1995
1
0
The problems are Number 12 and 13 on this link
http://isites.harvard.edu/fs/docs/icb.topic1096438.files/PS4.pdf

I have the value of k for sum number 12, it is 1.54*10^-4.

Im completely stuck with number 13 cos I'm unfamiliar with that concept and it kinda went over my head in lecture this morning.

If anyone wants to help with 14, it would be appreciated :D

The problem set is due in like 10 hours, so no pressure xD
 
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  • #2
the integrated rate law for 0th,1st,2nd order might help for problem 13.
for q.14 use first two data to find the rate law and rate constant.
then using arrhenious equation and the third data find rate constant at 650K.
use the integrated form of rate law to find the required time.
 

1. What is activation energy?

Activation energy is the minimum amount of energy required for a chemical reaction to occur. It is the energy barrier that must be overcome in order for reactant molecules to form products.

2. How does activation energy affect the speed of a reaction?

The higher the activation energy, the slower the reaction will be. This is because a higher activation energy means that more energy is required for the reactant molecules to collide with enough force to overcome the energy barrier and form products.

3. How is activation energy determined experimentally?

Activation energy can be determined experimentally by using the Arrhenius equation, which relates the rate of a reaction to the activation energy, temperature, and other constants. By measuring the rate of a reaction at different temperatures, the activation energy can be calculated.

4. How can the activation energy of a reaction be lowered?

The activation energy of a reaction can be lowered by using a catalyst. A catalyst is a substance that increases the rate of a reaction by providing an alternate pathway with a lower activation energy. This allows the reaction to occur more quickly and at a lower temperature.

5. Can activation energy be negative?

No, activation energy cannot be negative. It is always a positive value because it represents the energy required for a reaction to occur. However, a negative activation energy can be observed in reactions that release energy, such as exothermic reactions. In these cases, the activation energy is still a positive value, but the overall change in energy is negative.

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