Energy Profile Diagrams
Chemistry ⇒ Thermochemistry and Energetics
Energy Profile Diagrams starts at 11 and continues till grade 12.
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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.
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?
The energy profile diagram for a reaction shows the products at a higher energy than the reactants. Is the reaction exothermic?
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?
Which of the following best describes the effect of a catalyst on the energy profile diagram? (1) Lowers the activation energy (2) Raises the activation energy (3) Increases the enthalpy change (4) Decreases the enthalpy change
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 in an energy profile diagram? (1) The lowest energy point (2) The highest energy point (3) The energy of the products (4) The energy of the reactants
Which of the following is NOT shown on a typical energy profile diagram? (1) Activation energy (2) Enthalpy change (3) Reaction rate (4) Transition state
Fill in the blank: The ________ of a reaction is the energy difference between the reactants and the highest point on the energy profile diagram.
The activation energy is the energy difference between the ________ and the ________ in an energy profile diagram.
The difference in energy between the reactants and the products in an energy profile diagram is called the ________.
The minimum energy required for a reaction to occur is called ________.
The energy profile diagram for a reaction shows the products at a higher energy than the reactants. Is the reaction exothermic?
True or False: The activation energy is always positive.
True or False: The energy profile diagram can be used to predict the rate of a reaction.
True or False: The energy profile diagram for a catalyzed reaction has a lower activation energy than that for an uncatalyzed reaction.
