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7. Energy, Rate and Equilibrium

Energy Diagrams

7. Energy, Rate and Equilibrium

Energy Diagrams

Multiple Choice
Which of the following statements is true regarding the energy diagram provided?
i. The reaction is endothermic.
ii. The activation energy is +10 kJ.
iii. The reaction releases energy.
iv. The enthalpy of the reaction is –25 kJ.
Multiple Choice
Which of the following reactions proceeds the slowest?

Reaction 1 Reaction 2 Reaction 3
Open Question
Which reaction is faster, one with E_act = +10 kcal/mol(+41.8 kJ/mol) or one with E_act = +5 kcal/mol(+20.9 kJ/mol)? Explain.
Open Question
a. Why do chemical reactions require energy of activation?
Open Question
c. Draw an energy diagram for an exothermic reaction.
Open Question
Sketch an energy diagram for a system in which the forward reaction has E_act = +25 kcal/mol (+105 kJ/mol) and the reverse reaction has E_act = +35 kcal/mol (+146 kJ/mol).Is the forward process endergonic or exergonic?