Bond and Transfer Energy

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Energy transfers in chemical reactions all about making and breaking bonds.

  • During chemical reactions old bonds are broken and new bonds are formed
  • Energy must be supplied to break these bonds - bond breaking is an Endothermic process
  • Energy is released when new bonds are formed -bond formation is an Exothermic process

Endothermic                                                       Exothermic

NaCl-----> Na+ Cl                                               Mg+O------> MgO+energy released

In exothermic reactions energy released by forming the bond is greater than energy required to break the bond.

In endothermic reactions energy used to break the bond is greater than energy


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