Today we had a visitor from Discovery Gateway. She demonstrated several experiments that helped us understand the differences between physical and chemical changes. Then we got to go into the lab ourselves, put on goggles, and mix things together to investigate what we had learned. We each also got a ticket to experience a day at Discovery Gateway.
A poem to help remember:
A physical change changes how things look,
Like tearing the pages in a book,
Or freezing liquid, like water to ice,
Or painting a house to make it look nice.
In a chemical change the substances you start out with are different from the substances you end up with. A new substance has been formed and has different properties. There is a new solid, liquid, or gas formed - examples: the stomach (remember the demonstration of a new gas formed), foam insulation; an unexpected color change - examples: (demonstration of mixing chemicals together; or a change in energy - the product becomes hot or cold or gives off light - examples: hand warmers or glow sticks. Other examples: Baking a cake, cooking an egg, burning wood.
A poem to help remember.
A chemical change has come to pass
If you see a new solid, liquid, or gas.
The color may change or the energy, too,
A chemical change makes something new.
1 comment:
thx for the poem it will b helpful i love u as a teacher u rock mrs b
mia
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