1. Chemical and Physical Changes
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2. Chemical Change What is a chemical change?
Any change that results in the formation of a new chemical substance
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3. Chemical Change What are the signs of a chemical change? Color change
Formation of a precipitate
Formation of a gas
Odor change
Temperature change
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4. Chemical Change - Examples
Rust formation on a nail
Souring of milk
Sean McMenemy, Flickr (CC BY 2.0)
Kagor, Wikimedia Commons (CC BY-SA 3.0)
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5. No new substance is formed.
Physical Change
What is a physical change?
Any change not involving a change in the substance’s chemical identity
No new substance is formed.
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6. Physical Change - Examples
Cutting paper
Making orange juice
Pixabay (CC0)
Scott Bauer, USDA (CC0)
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7. Your Turn to Decide!
Read the Task Cards at each station and perform the task.
Decide whether each task represented a chemical or a physical change.
Record your results in the provided data table.
Clean up each station once you are finished.
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