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Chemical Reactions: Copper Oxygen

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Chemical Reactions: Copper Oxygen

Copper foil is heated in air during a supervised laboratory investigation. Use the evidence and data on this sheet to explain the reaction. Wear safety glasses and a lab coat; handle hot equipment only with tongs and follow your laboratory’s safety instructions.

Evidence from the investigation

A student heats clean copper foil in air. The shiny reddish-brown surface becomes coated with a dull black solid. After cooling, the student weighs the foil and its coating.

Before heating: copper foil = 2.40 g

After heating: foil plus black coating = 3.00 g

1.What visible change provides evidence that a chemical reaction occurred?

2.Identify the reactants and product in the reaction between copper and oxygen. Include each substance’s formula.

3.Complete and balance the equation. Include state symbols: ___Cu(s) + O₂(g) → ___CuO(s)

4.How many copper atoms and oxygen atoms are on each side of the balanced equation in Question 3?

5.Calculate the mass of oxygen that combined with the copper foil. Show your calculation using the measurements above.

6.Explain why the mass increased even though no solid was added to the foil during heating.

7.A student says, “The oxygen atoms disappeared because oxygen gas is no longer visible.” Explain why this claim conflicts with conservation of atoms.

8.Copper heated strongly in limited oxygen can form copper(I) oxide, Cu₂O, instead of copper(II) oxide. Balance this equation: Cu(s) + O₂(g) → Cu₂O(s).

9.Copper roofs can develop a green patina over time. Is that green layer simply the black copper(II) oxide formed in this investigation? Explain briefly.

10.The student repeats the heating, but the foil is not heated long enough and some copper remains reddish-brown. Predict how the final mass may compare with a sample converted completely to copper oxide, and explain why.

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Chemical Reactions: Copper Oxygen

Chemical Reactions: Copper Oxygen

Evidence from the investigation

2 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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