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What you will learn from this videoWhat you will learn
- When substances undergo chemical reactions their properties change.
- The total number of atoms does not change throughout a chemical reaction.
- Scientists use chemical reactions to create new materials and medicines.
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What is the difference between a chemical and physical change?
Are the number of atoms before and after a chemical reaction the same? Why?
What are two ways you can tell that the steel wool in the video underwent a chemical reaction?
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