GCSE Chemistry – Activation energy

Last updated: 14/04/2020

Learning Objectives

-I can describe how a catalyst lowers activation energy
-I can draw an energy profile diagram for a catalysed and an uncatalysed reaction

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  1. What is the definition of activation energy?

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  2. What is the definition of a catalyst?

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  3. What does a catalyst do to the activation energy of a reaction?

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  4. Which has a higher activation energy, an uncatalysed reaction or a catalysed reaction?

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  5. Which has a lower activation energy, an uncatalysed reaction or a catalysed reaction?

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  6. What is the definition of a energy profile diagram?

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  7. What lies on the x axis of an energy profile diagram?

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  8. What lies on the y axis of an energy profile diagram?

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  9. What type of line should be drawn to show the activation energy on an energy profile diagram?

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  10. When drawing the activation energy on an energy profile diagram, where should the line start from?

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  11. When drawing the activation energy on an energy profile diagram, where should the line end?

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  12. What should be drawn on an energy profile diagram to show activation energy?

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  13. When drawing an arrow on an energy profile diagram to show the activation energy, which way should the arrow be drawn?

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  14. For an uncatalysed reaction, which has more energy the reactants or products?

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  15. For an uncatalysed reaction, which has less energy the reactants or products?

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  16. Which of the following best describes the place for the activation energy on an energy profile diagram for an uncatalysed reaction?

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  17. For an uncatalysed reaction, explain where the reactants will fall on an energy profile diagram compared to the products.

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  18. For an uncatalysed reaction, explain where the products will fall on an energy profile diagram compared to the reactants.

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  19. For a catalysed reaction, which has more energy the reactants or products?

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  20. For a catalysed reaction, which has less energy the reactants or products?

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  21. Which of the following best describes the place for the activation energy on an energy profile diagram for a catalysed reaction?

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  22. For a catalysed reaction, explain where the reactants will fall on an energy profile diagram compared to the products.

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  23. For a catalysed reaction, explain where the products will fall on an energy profile diagram compared to the reactants.

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  24. When drawing an energy profile diagram, which reaction will have a higher curved line drawn to signify its activation energy an uncatalysed reaction or a catalysed reaction?

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  25. When drawing an energy profile diagram, which reaction will have a lower curved line drawn to signify its activation energy an uncatalysed reaction or a catalysed reaction?

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