Energy Profile Diagrams
Chemistry ⇒ Thermochemistry and Energetics
Energy Profile Diagrams starts at 11 and continues till grade 12.
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See sample questions for grade 11
Describe how a catalyst affects the energy profile diagram of a chemical reaction.
Describe how the energy profile diagram would change if a different catalyst is used that is more effective than the original.
Explain the significance of the transition state in a chemical reaction.
Explain why a catalyst does not affect the position of reactants and products on an energy profile diagram.
Explain why exothermic reactions are often spontaneous, using the energy profile diagram.
Explain why the activation energy for the reverse reaction is different from that of the forward reaction in an energy profile diagram.
If a reaction has a high activation energy, what can you infer about its rate at room temperature?
If the activation energy for a reaction is 50 kJ/mol and the energy difference between reactants and products is -30 kJ/mol, what is the energy of the transition state relative to the reactants?
In a multi-step reaction, which step determines the overall rate of the reaction?
In an energy profile diagram, the difference in energy between the reactants and the products is 60 kJ, with the products being lower. What is the enthalpy change (ΔH)?
In an energy profile diagram, the reactants are at 100 kJ, the products at 40 kJ, and the peak at 150 kJ. What is the activation energy?
In an energy profile diagram, what does a plateau between two peaks represent?
In an energy profile diagram, what does the vertical axis typically represent?
In an exothermic reaction, is the energy of the products higher or lower than the energy of the reactants?
The energy profile diagram for a reaction shows the reactants at 200 kJ, the products at 150 kJ, and the peak at 250 kJ. What is the activation energy for the reverse reaction?
The energy profile diagram for a reaction shows the reactants at 50 kJ, the first peak at 120 kJ, an intermediate at 80 kJ, and the second peak at 140 kJ. What is the activation energy for the second step?
The energy profile diagram for a reaction shows the reactants at 80 kJ, the products at 120 kJ, and the peak at 200 kJ. What is the activation energy?
The energy profile diagram for a reaction shows two peaks. What does this indicate about the reaction mechanism?
The enthalpy change (ΔH) for a reaction is +45 kJ/mol. What does this indicate about the reaction?
The enthalpy change (ΔH) for a reaction is -75 kJ/mol. Is the reaction exothermic or endothermic?
