AP QUIZZES - AP TOPIC 5 Qualitative & Quantitative Chemistry SET E
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QUESTION 1. Some half-reactions take place in BASIC (OH-) conditions. One such half-reaction is the conversion of manganate (VII) ions (permangante) to MnO2. The technique for balancing a half-reaction in BASIC solution is the same as if it were in ACID solution (using hydrogen ions and water), but with the additional, final step of removing any excess hydrogen ions by adding hydroxide ions to both side of the equation and then removing any duplicate molecules or ions (simplifying).

How many hydroxide ions, and on which side of the equation, are present, when the half-reaction below is balanced in BASIC solution using the smallest possible integers?

MnO4- ==> MnO2


(A) 2 on reactant side
(B) 2 on product side
(C) 4 on reactant side
(D) 4 on product side
(E) None of the Above

QUESTION 2. Which statement in relation to NET IONIC equations is FALSE?

(A) Spectator ions are canceled out
(B) Spectator ions do not take part in the reaction
(C) All species that change oxidation state must be included
(D) All atoms and charges must be balanced
(E) Atoms need to be balanced but charges do not

QUESTION 3. Which of the following statements in FALSE?

(A) Precipitates are formed when two aqueous solutions combine to form an insoluble compound
(B) Oxidation can occur on its own with no reduction process accompanying it
(C) Combustion is a REDOX reaction
(D) The oxidation number of Ca in CaO2 is +2
(E) Chlorine gas will displace Bromine from a solution of potassium bromide

QUESTION 4. Which of the following metals will displace hydrogen from both water AND an acid?

(A) Sodium
(B) Aluminum
(C) Zinc
(D) Gold
(E) Silver

QUESTION 5. In the following reaction, which species is acting as an acid in the REVERSE (right to left) reaction?

NH3 + H2O <==> NH4+ + OH-


(A) NH3
(B) Water
(C) Hydroxide ions
(D) NH4+
(E) Not enough information to tell




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