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2Cu+S→Cu2S Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the...

Electrolysis of water breaks 2 molecules of water (2H2O) into two molecules of hydrogen and one of oxygen. Explain why this is a chemical change Answer in a 7th graders words in 2 small sentences