Apentix/AP Chemistry/Unit 4: Chemical Reactions/Question

AP Chemistryeasymcq1 pt

Which single-replacement reaction proceeds spontaneously as written?

A.Mg(s) + 2AgNO₃(aq) → Mg(NO₃)₂(aq) + 2Ag(s)

B.Cu(s) + Zn(NO₃)₂(aq) → Cu(NO₃)₂(aq) + Zn(s)

C.Ag(s) + Mg(NO₃)₂(aq) → AgNO₃(aq) + Mg(s)

D.Sn(s) + 2KNO₃(aq) → Sn(NO₃)₂(aq) + 2K(s)

Explanation

Core Concept

Magnesium stands far above silver in the activity series, so magnesium atoms spontaneously transfer electrons to Ag⁺ ions and silver metal plates out of solution. A displacement proceeds only when the free metal outranks the metal belonging to the ion. Checking the two relative positions in the series settles any proposed displacement instantly.

Correct Answer

AMg(s) + 2AgNO₃(aq) → Mg(NO₃)₂(aq) + 2Ag(s)

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