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AP Chemistry 4.3: Particulate Models of Reactions

Practice AP Chemistry questions on translating chemical equations into particulate drawings that preserve particle identity, stoichiometry, phase, matter, and charge.

Syllabus
Effective Fall 2025
Course
AP Chemistry

Exam points

  • Explain how electrochemical cells convert chemical energy to electrical work through redox and electron flow.
  • Apply standard potentials, cell notation and thermodynamic relationships to predict cell spontaneity.

4.3.A—Represent a given chemical reaction or physical process with a consistent particulate model question 1

[Maximum number: 3]

Answer the following questions relating to the element aluminum, Al.

The following diagram gives an incomplete particulate representation of the reaction. The beaker on the left represents the system before the mixture reacts. Complete the drawing on the right to represent the system after the reaction has occurred. Be sure to include 1) the correct type and number of particles based on the number shown on the left and 2) the relative spacing to depict the appropriate phases.

Figure for Question 4.3.A—Represent a given chemical reaction or physical process with a consistent particulate model question 1 — AP Chemistry
 Al =Al atom  Ag =Ag atom Al3+=Al3+ ion Ag+=Ag+ion \begin{array}{ll} \text { Al }=\mathrm{Al} \text { atom } & \text { Ag }=\mathrm{Ag} \text { atom } \\ \mathrm{Al}^{3+}=\mathrm{Al}^{3+} \text { ion } & \mathrm{Ag}^{+}=\mathrm{Ag}^{+} \text {ion } \end{array}

The student finds the standard reduction potentials given in the table, which are related to the reaction that occurs.

Table for Question 4.3.A—Represent a given chemical reaction or physical process with a consistent particulate model question 1 — AP Chemistry
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