Homemade Hand Warmer
In this easy science experiment for kids you will learn to make a super easy homemade hand warmer using calcium chloride and SAP crystals. This is a great activity to demonstrate an exothermic chemical reaction and the result is an awesome hand warmer that works really well and produces an impressive amount of heat.
- Small ziplock baggie
- About one tablespoon of SAP crystals or water beads
- About one tablespoon of calcium chloride
- Open the ziplock baggie and put the SAP crystals inside.
- Add about a quarter cup of water.
- Zip the baggie closed and let it sit for several minutes until the water is mostly absorbed.
- Now add the calcium chloride to the baggie.
- Add about another quarter cup of water and zip the baggie closed securely. Try not to leave a lot of extra air in the baggie.
- Knead the baggie until the calcium chloride is dissolved.
- You will feel a significant increase in temperature.
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How it Works:
When the solid calcium chloride dissolves in water, an exothermic chemical reaction occurs releasing heat.
Make This A Science Project:
What happens if you use a larger baggie? What happens if you use a different amount of water? What happens if you use a different liquid? What happens if you add an entirely new ingredient like iron filings to the experiment?
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