Chemistry·Chemical reactions · NSSCO 6.1
Physical & chemical changes
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Melting ice and burning wood both change a substance — but only one makes something new. Learn to tell a physical change (reversible, no new substance) from a chemical change (new substance, energy change, hard to reverse), and spot the tell-tale signs of a reaction.
What you'll learn in this lesson
By the end you should be able to (NSSCO Chemistry 6.1):
- Distinguish between chemical and physical changes
- Recall that chemical reactions involve an energy change
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