4.6 Lab: Types of Reactions Answers

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In this experiment, you made observations of the ✔ reactantstype of reactiontemperature

and the balanced equationconcentration✔ products .

You used these observations to write the ✔ balanced chemical equationconcentrationsstates of matter

and ✔ classify the reactiondetermine the yield make more products.

What signs of a chemical reaction did you observe during the lab? Check all that apply.

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

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.

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

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

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.

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.)

H2S(g) →

Ag2S(s) +

H2(g)

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