What signs of a chemical reaction did you observe during the lab? Check all that apply.
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Explain how you know it must be oxygen. Where did the oxygen come from?
I know it must be oxygen because the product formed is copper oxide, which consists of copper and oxygen atoms. Since copper was the starting metal, it must have reacted with oxygen from the surrounding air to form the compound.
As a cake bakes, sodium bicarbonate reacts with acids in the cake. The bicarbonate ion and the anion in the acid change places to make carbonic acid. The carbonic acid then breaks down to produce carbon dioxide bubbles that make the cake rise. Check all of the reactions that occurred.
Which of the following best explains why you put KI and Pb(NO3)2 into two separate test tubes before mixing them?
Which of the following best explains why you sanded the copper wire before burning it?
Check all of the reasons that you included in your answer.Copper oxide is the only product, and it contains copper and oxygen.One of the reactants is copper, so the other reactant must be oxygen.The copper metal must have combined with something in the air.
When silver tarnishes, a reaction happens.
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