GCSE Chemistry – Bond Energies – Determining if Reactions are Exothermic or Endothermic

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*** WHAT’S COVERED ***
1. Bond Energy
* The definition of bond energy as the energy required to break one mole of a particular covalent bond.
* How bond breaking is an endothermic process that requires energy from the surroundings.
* How bond formation is an exothermic process that releases energy to the surroundings.
2. Calculating Overall Energy Change
* The principle of comparing the energy needed to break bonds in the reactants with the energy released when forming bonds in the products.
* The formula for calculating the overall energy change for a reaction.
* A worked example for the reaction of hydrogen and chlorine to form hydrogen chloride.
* A worked example for the reaction of nitrogen and hydrogen to form ammonia.

*** EXAM BOARD SPECIFIC INFO ***
– Higher tier only
– All exam boards
– Triple and combined science

*** CHAPTERS ***
0:00 Introduction
0:17 What is Bond Energy?
0:53 Bond Breaking (Endothermic) vs Bond Forming (Exothermic)
1:16 Calculating Overall Energy Change
2:09 Worked Example: H₂ + Cl₂
2:59 Worked Example: N₂ + 3H₂

*** PLAYLISTS ***

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