GCSE Chemistry – Energy changes in a reaction

Last updated: 18/04/2020
GCSE Science – Irish Junior Cycle (Biology, Chemistry, Physics, Earth and Space) Energetics and rates of reaction GCSE Chemistry – Energy changes in a reaction

Learning Objectives

-I can determine the energy change in a reaction
-I can recall that energy is needed to break bonds
-I can recall that energy is released when bonds are made
-I can calculate the energy change in a reaction

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  1. Current
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  3. Answered

  1. What is the definition of bond energy?

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  2. What are the units for bond energy?

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  3. What are bond energies used to calculate?

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  4. What is the definition of an exothermic reaction?

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  5. What is the definition of an endothermic reaction?

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  6. What part of a reaction will energy be taken in?

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  7. What part of a reaction will energy be released?

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  8. What is needed for bonds to be broken?

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  9. When energy is released during bond making, where is it released to?

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  10. What type of process is bond breaking?

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  11. What type of process is bond making?

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  12. What part of a reaction will bond breaking be taking place?

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  13. What part of a reaction will bond making be taking place?

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  14. Describe the energy change taking place when bonds are broken.

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  15. Describe the energy change taking place when bonds are made.

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  16. What part of a reaction will tell you if it is an exothermic or endothermic reaction?

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  17. What is the equation for working out the overall energy change of a reaction?

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  18. When calculating the overall energy of a reaction some information will be given to you in a table, what is this information?

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  19. Which information should be worked out in order to calculate the overall energy change of a reaction?

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  20. Which information should be worked out in order to calculate the overall energy change of a reaction?

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  21. Use the following bond energies to calculate the overall energy change for the combustion of methane.

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  22. Use the following bond energies to calculate the overall energy change for the combustion of ethene.

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  23. Use the following bond energies to calculate the overall energy change for the combustion of propane.

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  24. Use the following bond energies to calculate the overall energy change for the combustion of propene.

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  25. Use the following bond energies to calculate the overall energy change for the combustion of butane. 

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