Chemical Heat Pack
Product Code: H09
Experience instant phase changes and chemical heat in your hand!
New Zealand Price Estimate: |
7.15 |
Product Description
A neat heat pack that will have students experience a very useful and fun phase change: a liquid turning into a solid instantly!
Simply click the metal disc floating in the supersaturated sodium acetate solution and three notable changes will take place:
1. liquid to solid
2. a light colour change
3. temperature change --> room temp to approx. 50 ℃ (an exothermic reaction)
Can be recycled many times by boiling the pack in hot water for 4 minutes. This action favours the endothermic reaction.
Included: One heat pack of 9.5 x 9.5 cm
Teach: phase changes, solids, liquids, exothermic & endothermic reactions, supersaturation, Le Chatelier's principle
Age: 6+
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