Activation Energy Diagrams│Please Help!

Question

For the following diagram, select all statements that are true.

Diagram Link: https://assets.learnosity.com/organisations/154/1b178e16-4f43-48fb-807e-ab2e138b23c8.PNG

The reaction is endothermic.

The activation energy of the reaction is 100kJ.

The energy of the reactants is 40kJ.

The energy change of the reaction is -20kJ.

Answer 1

In the figure, potential energies (PE) are

A + B: 40 kJ

transition state: 100 kJ

C + D: 20 kJ

True statements are

The energy of the reactants is 40kJ

A + B (on the left) are the reactants

The energy change of the reaction is -20kJ

The energy change of the reaction is

product energy – reactant energy = (20 – 40) kJ

The other statements are false

The reaction is endothermic is a false statement

because the energy change is negative (20 kJ – 40 kJ = –20 kJ)

This means that the reaction is exothermic

The activation energy of the reaction is 100kJ is a false statement

The activation energy is transition state energy – reactant energy = (100 – 40) kJ