The energy change of reactions (HT only)
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Breaking and making bonds

Breaking and making bonds

Reaction energy diagram showing H2 and Cl2 bonds broken with energy absorbed, then two HCl bonds formed with energy released, and notes linking the sign of delta H to exothermic and endothermic reactions

Chemical reactions rearrange atoms from reactants into products. To make that happen, bonds in the reactants must be broken and new bonds in the products must be formed.

The energy change of reactions (HT only) Lesson

  1. GCSE
  2. /Chemistry
  3. /The energy change of reactions (HT only)