Chemistry

• Heat is given out
• Temperature rises.
• "EXO"thermic , think of the exo as exit- given out- running out the exit.
• Some examples of exothermic reactions are:
• burning
• neutralisation reactions between acids and alkalis
• the reaction between water and calcium oxide
• 
  transfer energy to the surroundings.

• temperature drops
• Energy is absorbed from the surroundings.
• examples of endothermic reactions are:
• electrolysis
• the reaction between ethanoic acid and sodium carbonate
• the thermal decomposition of calcium carbonate in a blast furnace

• In a reversible reaction, the products can react to produce the original reactants again.
• For example,

  ammonium chloride ammonia + hydrogen chloride

La Chatliers Principal

" any cnage you make to the system, the system will try to counteract then eg: making sandwiches , then undo them."

• For maximum yield we have to shift equilibrium to right hand side.
• Increase Pressure- system tries to decrease pressure.
• Change temperature- system tries to decrease temperature this favours the endothermi reaction.