Term 4

• Heat of reaction


  the energy absorbed or released per mole in a chemical

  reaction.
• Exothermic reaction


  Reactions that release energy
• Endorthermic


  Reactions that absorb energy
• ΔH > 0 for endothermic reactions
• Activation energy


  the minimum energy needed for a reaction to take place.
• Activation complex


  the unstable transition state from reactants to products.
• Oxidatusing agent 


  A substance that is reduced/that gains electrons/whose oxidation

  number decreases.
• Reduction 


  A gain of electrons.
• Catalyst


  A substance that increases the rate of a reaction without itself undergoing a permanent change or being used up
• oxidation reaction = oxidation number increases
• oxidation no. hydrogen = +1 when it bonds with a non-metal
• oxidation


  a = a₊¹ + e⁻