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

2. 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.

3. 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

4. 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

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

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

7. Plenary