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Which one is a chemical reaction? Why?
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Which one is a chemical reaction? Why?

Which one is a chemical reaction? Why?-example-1
User Amorphic
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1 Answer

6 votes

Answer:

Copper turns green on exposure to air

Step-by-step explanation:

Liquid water freezes to form ice: Physical change

Reason: Water can melt back when it becomes ice.

Copper turns green on exposure to air: Chemical change

Reason: The copper can not change back from the green state when it turns green.

User Adam Heath
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