Higher Starter Qs Potential Energy Diagram Quiz

The activation energy is represented on a potential energy diagram as:

• The energy difference between reactants and products

• The energy of the products only

• The energy from the reactants to the peak of the curve

• The energy of the activated complex minus the product energy

What does the peak of the potential energy curve represent?

• The products

• The reactants

• The activation energy

• The activated complex

In an exothermic reaction, which of the following is true?

• Products have more energy than reactants

• Reactants and products have equal energy

• Reactants have more energy than products

• Activation energy is negative

What is the overall energy change in a potential energy diagram?

• The energy difference between the peak and the products

• The energy difference between reactants and products

• The energy at the peak of the curve

• The energy of the reactants only

The height of the activation energy barrier

• The height of the activation energy barrier

• The difference between reactant and product energy levels

• The position of the activated complex

• The area under the curve

The addition of a catalyst affects a potential energy diagram by:

• Raising the energy of the reactants

• Lowering the energy of the products

• Reducing the height of the activation energy barrier

• Increasing the temperature of the system

Which part of the potential energy diagram is altered by the presence of a catalyst?

• Reactant energy

• Product energy

• Activation energy

• Temperature

In an endothermic reaction, what happens to energy?

• It is released to the surroundings

• It remains unchanged

• It is absorbed from the surroundings

• It is only released if a catalyst is used

What does the flat portion at the end of a potential energy diagram represent?

• The energy of the activated complex

• The energy of the reactants

• The energy of the transition state

• The energy of the products