AP CHEMISTRY PRACTICE TEST 2026 COMPLETE QUESTIONS AND SOLUTIONS

AP CHEMISTRY PRACTICE TEST 2026
COMPLETE QUESTIONS AND SOLUTIONS


◉ The following questions refer to the reactions represented below.




(A) H2SeO4(aq) + 2 Cl-(aq) + 2 H+(aq) → H2SeO3(aq) + Cl2(g) +
H2O(l)
(B) S8(s) + 8 O2(g) → 8 SO2(g)
(C) 3 Br2(aq) + 6 OH-(aq) → 5 Br-(aq) + BrO3-(aq) + 3 H2O(l)
(D) Ca2+(aq) + SO42-(aq) → CaSO4(s)
(E) PtCl4(s) + 2 Cl-(aq) → PtCl62-(aq)


A reaction in which the same reactant undergoes both oxidation and
reduction. Answer: 3 Br2(aq) + 6 OH-(aq) →
5 Br-(aq) + BrO3-(aq) + 3 H2O(l)


◉ When water is added to a mixture of Na2O2(s) and S (s) , a redox
reaction occurs, as represented by the equation below.

, 2 N a 2 O 2 solid plus S solid plus 2 H 2 O liquid react to form 4 N a O
H aqueous plus S O 2 aqueous


Atoms of which element are reduced in the reaction? Answer: O in
Na2O2; each atom gains one electron


◉ Al(s)→Al3+(aq)+3e−


Zn2+(aq)+2e−→Zn(s)


The half-reactions for the oxidation-reduction reaction between Al(s)
and Zn2+(aq) are represented above. Based on the half-reactions, what is
the coefficient for Al(s) if the equation for the oxidation-reduction
reaction is balanced with the smallest whole-number coefficients?
Answer: 2


◉ Ni(s)→Ni2+(aq)+2e−


Ag+(aq)+e−→Ag(s)


Which of the following is the balanced net ionic equation for an
oxidation-reduction reaction between Ag+(aq) and Ni(s) based on the
half-reactions represented above? Answer:
2Ag+(aq)+Ni(s)→2Ag(s)+Ni2+(aq)**