Lab: Types of Reactions

Question 1

A piece of wire extending through a bunsen burner flame. When you burned copper, the product copper oxide appeared on the wire. Besides copper, the other reactant is ⇒ oxygen, O2.

Revolt · Accepted Answer

oxygen, O2

Question 2

Explain how you know it must be oxygen. Where did the oxygen come from?

Revolt · Accepted Answer

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.

Question 3

Ag2S(s) +

Revolt · Accepted Answer

1

Question 4

H2(g)

Revolt · Accepted Answer

1

Question 5

Check all of the reasons that you included in your answer.

Revolt · Accepted 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.

Question 6

Select all steps below that you followed to practice laboratory safety during the experiment.

Revolt · Accepted Answer

used tongs or a test tube holder to hold materials over the Bunsen burner flame; wore gloves and goggles; did not smell the gases produced

Question 7

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.

Revolt · Accepted Answer

decomposition; double replacement

Question 8

Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)

Revolt · Accepted Answer

2; 1

Question 9

When silver tarnishes, a combustiondecompositiondouble replacement✔ single replacementsynthesis reaction happens.

Revolt · Accepted Answer

✔ single replacement

Question 10

After you finished the experiment, which of the following did you do?

Revolt · Accepted Answer

made sure the gas to the Bunsen burner was turned off; cleaned all glassware

Lab: Types of Reactions Answers

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