STEM X
An exothermic reaction - Dehydration of sucrose
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Dehydration Demonstration in the fume cupboard for students to analyse:
- safety
- chemical changes
- observations of physical properties before and after the reaction
- energy changes
- exothermic reaction
- energy held in the bonds of sucrose
- bonding
- comparison of this reaction to enzyme catalysed reactions in cells
- comparison with cellular respiration
- measurements that could be taken
An endothermic reaction - Electrolysis of water
Electrolysis Demonstration for students to analyse:
- safety
- observations of the electrodes, gases and volumes forming
- observations of physical properties of reactants and products
- prediction of the new substances formed
- testing of the new substances formed
- energy changes
- endothermic reaction
- comparison the physical changes of water eg solid --> liquid --> gas
- comparison of the strength and nature of inter-molecular and intra-molecular forces.