[Destiny]

I have doubts in these 2 MCQ's which are

1.For an endothermic and exothermic reaction,where ΔH represents the enthalpy of the reaction in KJ/mol,the minimum value for the energy of activation will be respectively

a.less than ΔH and more than ΔH
b.more than ΔH and less than ΔH
c.more than ΔH and more than ΔH
d.Equal to ΔH



2.If the concentration of reactants is increased by x then rate constant K becomes

a.ln K/x
b.k/x
c.k+x
d.k




THANKS
 

[Rutherford]

1.You missed something "more than ΔH and more than ΔH". Did you mean for the direct and reverse reaction?

[Destiny]

All the options are for direct reaction i.e forward reaction and i wanted to know what is the meaning of minimum activation energy

 

[Rutherford]

Look here http://en.wikipedia.org/wiki/Activation_energy.

[Destiny]

Can anyone help me with the answer to this question please?

 

[Rutherford]

The text I gave you has all answers you need. There is a graph there, that can help you solve the first question. For the second question, see the Arrhenius equation in the same wikkipedia text I gave you.

[irfan]

your question is quite valid... i wuld like to help you by suggesting a book relevant to chemical kinemtics is chemical engineering kinetics by ocatave levenspiel.... it as excellent book in this regard... i am sure it will help you out