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1. Which of the following best accounts for the differences in analyses of the
sample?
(A) ‘The sample was not properly purified.
(B) The original sample was contaminated and some astatine was lost
with each analysis. .
(C) The astatine transmuted to bismuth, which transmuted to lead over
the time course of analyses.
(D) The astatine sample was contaminated with bismuth during the first
analysis and then the sample was further contaminated with bismuth
and lead during the second analysis.
(E) The pure astatine sample was contaminated during the first analysis,
but the analyses by the independent lab were mixed up with those of
an unrelated sample from a completely different source.
Questions 446 and 447 refer to the following choices and the data table below.
A student forgot to label the flasks of 1.0-M concentrations of the following
solutions:
(A) ae
(B) Silver nitrate
(C) Barium chloride
(D) Mercury (I) nitrate
(E) Copper (II) nitrate
« 111
112 > 500 AP Chemistry Questions to Know by Test Day
To identify each compound, the student mixed equal volumes of the 1.0-M
solutions above, listed A-E, with a concentrated solution of NH3/aq). Each of the
compounds was numbered 1-5.
Compound Observation
(1) A tan precipitate forms
(2) No reaction
(3) A pale blue precipitate in a dark blue solution
(4) White precipitate
(5) Orange precipitate
446. Compound 3
447. Compound 5
448. A student adds aqueous NH; to a solution of Ni** ions and a precipitate
forms. When the student adds excess NH;3, the precipitate dissolves and
produces a deep blue solution. Which of the following best explains why
the precipitate dissolved in excess NH;?
(A) NH; is a strong base at high concentrations.
(B) NH; only acts as a base at low concentrations.
(C) Ni** forms a soluble, complex ion with NH.
(D) Ni** solubility increases with increased pH.
(E) Ni** gets reduced by the excess NH3, forming soluble Ni atoms.
449, In the laboratory, which of the following can produce a gas when added to
1M HCP
II. NaHCO,
Il. 1M NH3qq)
(A) I only
(B) II only
(C) Land II only
(D) I and III only
(E) I, U, and Ill ~~
Data Interpretation « 113
450. A solid, white crystalline substance is added to water to produce a basic
solution. When a strong acid is added to the solution, a gas is liberated.
Based on this information, the solid could be:
(A) NaCl
(B) NaOH
(C) NaNO;
(D)- Na,CO;
(E) Na,SO,
Questions 451-453 refer to the following experiment.
An experiment analyzed the ratios in which iron and oxygen combine to form different compounds. The following data were obtained.
Fe O2
28 g 8¢g
28 g 4¢
28 g 10.5 g
451. This experiment best demonstrates which of the following chemical principles?
(A) Conservation of mass
(B) Conservation of energy
(C) The law of definite proportions
(D) The law of multiple proportions
(E) The law of stoichiometry
452. If no other information was available, which of the following could be
determined from the data collected?
(A) Empirical formula
(B) Equilibrium constant
(C) Reaction order
(D) Enthalpy of formation
(E) Density
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