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Never mind I figured it out. A supply of copper pipes is stored outdoors. Over the course of many years, the copper reacts with oxygen and turns green. What clue indicates a chemical reaction took place? copper reacts with oxygen

User Zverok
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ok I’m happy you got the answer also thx for the points

User Stephen Croft
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Answer:

ok glad you got then answer right

User Nfarshchi
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