English

What happens to the rate constant k and activation energy Ea as the temperature of a chemical reaction is increased? Justify.

Advertisements
Advertisements

Question

What happens to the rate constant k and activation energy Ea as the temperature of a chemical reaction is increased? Justify.

Short/Brief Note
Advertisements

Solution

As the temperature of a chemical reaction rises, the rate constant k rises and the activation energy Ea falls.

According to Arrhenius equation

k = `"Ae"^(-"E"_"a"//"RT")`

As a result, the rate constant k rises exponentially as the temperature rises.

shaalaa.com
  Is there an error in this question or solution?
2022-2023 (March) Delhi Set 1

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

The rate constant for the first-order decomposition of H2O2 is given by the following equation:

`logk=14.2-(1.0xx10^4)/TK`

Calculate Ea for this reaction and rate constant k if its half-life period be 200 minutes.

(Given: R = 8.314 JK–1 mol–1)


The rate of the chemical reaction doubles for an increase of 10 K in absolute temperature from 298 K. Calculate Ea.


Consider a certain reaction \[\ce{A -> Products}\] with k = 2.0 × 10−2 s−1. Calculate the concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol L−1.


Calculate activation energy for a reaction of which rate constant becomes four times when temperature changes from 30 °C to 50 °C. (Given R = 8.314 JK−1 mol−1). 


What is the effect of adding a catalyst on Activation energy (Ea)


The decomposition of a hydrocarbon has value of rate constant as 2.5×104s-1 At 27° what temperature would rate constant be 7.5×104 × 3 s-1if energy of activation is  19.147 × 103 J mol-1 ?


Which of the following statements are in accordance with the Arrhenius equation?

(i) Rate of a reaction increases with increase in temperature.

(ii) Rate of a reaction increases with decrease in activation energy.

(iii) Rate constant decreases exponentially with increase in temperature.

(iv) Rate of reaction decreases with decrease in activation energy.


Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of one example.


It is generally observed that the rate of a chemical reaction becomes double with every 10°C rise in temperature. If the generalisation holds true for a reaction in the temperature range of 298 K to 308 K, what would be the value of activation energy (Ea) for the reaction?


Activation energy of any chemical reactions can be calculated if one knows the value of:


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×