Exothermic and Endothermic Reactions Aims We are learning to: Know that energy changes can be measured in chemical reactions. Keywords Exothermic, endothermic, energy.

Learning Outcomes What I am Looking For is that you will be able to…….: Must (Grade E/F): State a definition for exothermic and endothermic. Should (Grade C/D): Recognise an exothermic and endothermic reaction from a practical. Could (Grade B/C): Explain the difference between endothermic and exothermic.

Exothermic Endothermic Chemical reactions where HEAT… Is transferred to the surroundings… Indicated by a RISE in temperature Chemical reactions where HEAT… Is transferred from the surroundings … Indicated by a FALL in temperature

Experiment Liquid Temperature (°C) Solid Min or Max temp (°C) Endothermic or exothermic Hydrochloric acid Magnesium Water Ammonium Chloride Potassium Nitrate Sodium Thio-sulphate Sodium Hydroxide

Conclusion Write in a sentence which reactions are endothermic and which are exothermic.

Exothermic Endothermic Need to make bonds so take in energy, reducing the temperature. Break bonds which releases heat energy.

Plenary