AP Chemistry 4.7: Classifying Chemical Reactions

Practice AP Chemistry questions on classifying reactions as acid-base, redox, or precipitation by using proton transfer, oxidation numbers, electron changes, and insoluble…

Exam points

Explain how atomic structure and periodic trends determine element properties and chemical reactivity.
Apply electron configurations, ionization energy and size trends to compare elements and compounds.

[Maximum number: 1]

Sterling silver is an alloy that is commonly used to make jewelry and consists of 92.5\% silver and 7.5\% other metals, such as copper, by mass. Over time, the alloy can form a tarnish of $\mathrm{Ag}_{2} \mathrm{~S}(s)$ when it reacts with hydrogen sulfide, as represented by the following equation.

2 \mathrm{Ag}(s)+\mathrm{H}_{2} \mathrm{~S}(g) \rightarrow \mathrm{Ag}_{2} \mathrm{~S}(s)+\mathrm{H}_{2}(g)

What are the oxidation numbers of silver in Ag(s) and $\mathrm{Ag}_{2} \mathrm{~S}(s)$ ?

\mathrm{Ag}(s) \_\mathrm{Ag}_{2} \mathrm{~S}(s) \_

For the correct answer: 1 point
$\operatorname{Ag}(s)$ 0 $\mathrm{Ag}_{2} \mathrm{~S}(s)$ +1

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4.7.A—Identify a reaction as acidbase, oxidation-reduction, or precipitation. Chemical Reactions UNIT 4 question 1