Unit 7 - Chemical Energetics

Exothermic:

• Energy is given out

• products have less energy

• temperature increases

• Delta H = negative -ve

Endothermic:

• Energy is taken in

• products have more energy

• temperature decreases

• Delta H = positive +ve

Energy Change During Reactions:

• Enthalpy/energy change = energy of products (Hp) - energy of reactants (Hr)

• Activation Energy: minimum energy required to start a reaction

Making and Breaking Bonds:

• Endothermic

  • energy is taken to break bonds

  • Bond breaking

• Exothermic

  • energy is released to make bonds

  • Bond making

  
  

End of Chapter