Question

What is the significance of "Er" in the diagram?

A.) average molecular energy
B.) threshold energy for reaction
C.) maximum kinetic energy
D.) minimum kinetic energy

Answer 1

B.) threshold energy for reaction

hope it helps :)

Answer 2

The significance of "Er" in the diagram is :

B.) Threshold energy for reaction

Step-by-step explanation:

Threshold energy : It is total amount of energy required by the reactant molecule to reach the transition state .

Activation energy : It is the excess energy absorbed by the molecules to reach the transition state.

Activation Energy = Threshold Energy - Average Kinetic Energy

This means Activation energy decreases on increasing kinetic energy

On increasing Temperature average kinetic energy of the molecule increases which reduces the activation energy and the reaction occur faster in that case.

Catalyst also reduces the Activation energy.

Er = Threshshold energy for reaction at 30 degree

Ea = Activation Energy

The given figure shows that the threshold energy decreases on increasing the temperature

Only the molecule having energy greater than Er can react to form product