AP Chemistry Unit 4.7: Reaction Types

Practice AP Chemistry Unit 4.7 questions on identifying acid-base, redox, and precipitation reactions from proton transfer, oxidation-number changes, electron transfer, and solids.

Exam points

Use thermodynamic and kinetic evidence to predict reaction direction, rate, temperature effects, and outcomes.
Interpret energy profiles and rate data to distinguish activation control from thermodynamic favorability.

Covered syllabus points

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

[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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Covered syllabus points

4.7 Types of Chemical Reactions question 1