Energy Profile Diagrams
Chemistry ⇒ Thermochemistry and Energetics
Energy Profile Diagrams starts at 11 and continues till grade 12.
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A reaction has an activation energy of 75 kJ/mol and a ΔH of +20 kJ/mol. Is the reaction endothermic or exothermic?
Describe how a catalyst affects the energy profile diagram of a chemical reaction.
Describe how the energy profile diagram would change if a reaction is made more exothermic.
Describe the difference between the energy profile diagrams of a single-step and a multi-step reaction.
Explain the significance of the area under the curve in an energy profile diagram.
A reaction has an activation energy of 60 kJ/mol and a ΔH of -20 kJ/mol. What is the activation energy for the reverse reaction?
A reaction has reactants at 120 kJ, a transition state at 200 kJ, and products at 80 kJ. Calculate the enthalpy change (ΔH).
A reaction has reactants at 200 kJ, a transition state at 350 kJ, and products at 150 kJ. What is the activation energy?
Which of the following best describes the effect of increasing temperature on the energy profile diagram? (1) The activation energy increases, (2) The activation energy decreases, (3) The number of molecules with enough energy to react increases, (4) The enthalpy change increases
Which of the following best describes the enthalpy change (ΔH) for an exothermic reaction? (1) Positive, (2) Negative, (3) Zero, (4) Cannot be determined
Which of the following best describes the transition state? (1) A stable intermediate, (2) The highest energy point, (3) The energy of the products, (4) The energy of the reactants
Which of the following is NOT a feature of an energy profile diagram? (1) Transition state, (2) Activation energy, (3) Reaction rate constant, (4) Enthalpy change
In a reaction mechanism, the step with the highest activation energy is called the ________ step.
In an energy profile diagram, the difference in energy between the reactants and the transition state is called the ________.
In an energy profile diagram, the horizontal axis usually represents ________.
In an energy profile diagram, the vertical axis typically represents ________.
True or False: The addition of a catalyst changes the enthalpy change (ΔH) of a reaction.
True or False: The energy profile diagram can be used to determine the rate of a chemical reaction.
True or False: The energy profile diagram can be used to predict the spontaneity of a reaction.
True or False: The energy profile diagram can show the presence of intermediates in a reaction mechanism.
