Potential Energy Diagrams and Reactions

The video tutorial explains potential energy diagrams, focusing on activation energy and enthalpy change. It distinguishes between exothermic and endothermic reactions, including reverse reactions. The tutorial also covers analyzing potential energy diagrams with numerical values, bond strength, and stability. It concludes with problem-solving strategies using energy diagrams.

What is the term for the energy difference between reactants and the activated complex in a forward reaction?

• Kinetic energy

• Potential energy

• Activation energy

• Enthalpy change

In a potential energy diagram, what does a negative Delta H indicate about the reaction?

• The reaction is non-spontaneous

• The reaction is endothermic

• The reaction is exothermic

• The reaction is at equilibrium

How can you identify an endothermic reaction on a potential energy diagram?

• The products are lower in energy than the reactants

• The products are higher in energy than the reactants

• The activation energy is zero

• The enthalpy change is negative

What is the direction of a reverse reaction on a potential energy diagram?

• Bottom to top

• Top to bottom

• Right to left

• Left to right

For a reverse reaction, what is the sign of Delta H if the enthalpy is increasing?

• Negative

• Zero

• Undefined

• Positive

In a potential energy diagram, what does the energy of the activated complex represent?

• The highest energy point in the reaction

• The energy of the reactants

• The energy required to start the reaction

• The energy of the products

Which set of species has the strongest bonds in a potential energy diagram?

• The set with the lowest potential energy

• The set with the highest potential energy

• The set with the largest number of atoms

• The set with the most complex structure

What is the first step in solving problems using potential energy diagrams?

• Draw a potential energy diagram

• Calculate the activation energy

• Determine the enthalpy change

• Identify the reactants and products

If EA forward is 25 K and EA reverse is 40 K, what is Delta H forward?

• 15 K

• -65 K

• 65 K

• -15 K

In a potential energy diagram, if Delta H forward is positive, what can be said about Delta H reverse?

• It is undefined

• It is negative

• It is also positive

• It is zero