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AP CHEM FINAL EXAM | Questions And
Answers |Latest 2025 | Guaranteed Pass.
The mass spectrum of the element Sb is most likely represented by which of the following? -
Answer✔B
Which of the following ground-state electron configurations represents the atom that has the
lowest first-ionization energy? - Answer✔1s2 2s2 2p6 3s1
The mass spectrum of element X is presented in the diagram above. Based on the spectrum,
which of the following can be concluded about element X? - Answer✔The atomic mass of X is
between 90 and 92.
Based on periodic trends and the data in the table above, which of the following are the most
probable values of the atomic radius and the first ionization energy for potassium, respectively?
- Answer✔242 pm, 419 kJ/mol
A student obtains a sample of a pure solid compound. In addition to Avogadro's number, which
of the following must the student know in order to determine how many molecules are in the
sample? - Answer✔Molar mass of the compound, mass of the sample
How many carbon atoms are contained in 2.8 g of C2H4 ? - Answer✔1.2 x 1023
A solution of methanol, CH3OH, in water is prepared by mixing together 128 g of methanol and
108 g of water. The mole fraction of methanol in the solution is closest to - Answer✔0.40
Which of the following shows the correct number of protons, neutrons, and electrons in a
neutral cesium-134 atom? - Answer✔B
A sample of carbonate rock is a mixture of CaCO3 and MgCO3. The rock is analyzed in a
laboratory, and the results are recorded in the table above. Which columns in the table provide
all the information necessary to determine the mole ratio of Ca to Mg in the rock? -
Answer✔3,4,6,7
The effective nuclear charge experienced by the outermost electron of Na is different than the
effective nuclear charge experienced by the outermost electron of Ne. This difference best
accounts for which of the following? - Answer✔Na has a lower first ionization energy than Ne.
1
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Which of the following numerical expressions gives the number of particles in 2.0g of Ne? -
Answer✔2.0g/20.18g/mol(6.0x10^23 particles/mol)
Which of the following best helps to explain why the electron affinity of Br has a greater
magnitude than that of I? - Answer✔There is a greater attraction between an added electron
and the nucleus in Brthan in I.
A sample of a compound that contains only the elements C, H, and N is completely burned in
O2 to produce 44.0 g of CO2, 45.0 g of H2O, and some NO2 . A possible empirical formula of the
compound is - Answer✔CH5N
The ionization energies for element X are listed in the table above. On the basis of the data,
element Xis most likely to be - Answer✔Al
Which of the following represents an electron configuration that corresponds to the valence
electrons of an element for which there is an especially large jump between the second and
third ionization energies? (Note: n represents a principal quantum number equal to or greater
than 2.) - Answer✔ns2
The elements in which of the following have most nearly the same atomic radius? - Answer✔Cr,
Mn, Fe, Co
Consider atoms of the following elements. Assume that the atoms are in the ground state.
The atom that contains only one electron in the highest occupied energy sublevel - Answer✔Ga
The complete photoelectron spectrum for an element is shown above. Which of the following
observations would provide evidence that the spectrum is consistent with the atomic model of
the element? - Answer✔In its compounds, the element tends to form ions with a charge of +1.
In 1.00 mol of potassium zirconium sulfate trihydrate, K4Zr(SO4)4 • 3 H2O, there are -
Answer✔4 × 6.02 × 10^23 potassium atoms
The photoelectron spectrum for the element nitrogen is represented above. Which of the
following best explains how the spectrum is consistent with the electron shell model of the
atom? - Answer✔The electrons in the 2p sublevel have the smallest binding energy.
Of the following compounds, which is the most ionic? - Answer✔CaCl2
Which of the following compounds contains both ionic and covalent bonds? - Answer✔NH4Cl
The potential energy as a function of internuclear distance for three diatomic molecules, X2, Y2,
and Z2, is shown in the graph above. Based on the data in the graph, which of the following
correctly identifies the diatomic molecules, X2, Y2, and Z2? - Answer✔A
Which of the following correctly indicates whether the solid represented by the particulate
model shown above conducts electricity and explains why or why not? - Answer✔It does not
conduct electricity because its ions cannot move freely within the solid.
2
AP CHEM FINAL EXAM | Questions And
Answers |Latest 2025 | Guaranteed Pass.
The mass spectrum of the element Sb is most likely represented by which of the following? -
Answer✔B
Which of the following ground-state electron configurations represents the atom that has the
lowest first-ionization energy? - Answer✔1s2 2s2 2p6 3s1
The mass spectrum of element X is presented in the diagram above. Based on the spectrum,
which of the following can be concluded about element X? - Answer✔The atomic mass of X is
between 90 and 92.
Based on periodic trends and the data in the table above, which of the following are the most
probable values of the atomic radius and the first ionization energy for potassium, respectively?
- Answer✔242 pm, 419 kJ/mol
A student obtains a sample of a pure solid compound. In addition to Avogadro's number, which
of the following must the student know in order to determine how many molecules are in the
sample? - Answer✔Molar mass of the compound, mass of the sample
How many carbon atoms are contained in 2.8 g of C2H4 ? - Answer✔1.2 x 1023
A solution of methanol, CH3OH, in water is prepared by mixing together 128 g of methanol and
108 g of water. The mole fraction of methanol in the solution is closest to - Answer✔0.40
Which of the following shows the correct number of protons, neutrons, and electrons in a
neutral cesium-134 atom? - Answer✔B
A sample of carbonate rock is a mixture of CaCO3 and MgCO3. The rock is analyzed in a
laboratory, and the results are recorded in the table above. Which columns in the table provide
all the information necessary to determine the mole ratio of Ca to Mg in the rock? -
Answer✔3,4,6,7
The effective nuclear charge experienced by the outermost electron of Na is different than the
effective nuclear charge experienced by the outermost electron of Ne. This difference best
accounts for which of the following? - Answer✔Na has a lower first ionization energy than Ne.
1
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Which of the following numerical expressions gives the number of particles in 2.0g of Ne? -
Answer✔2.0g/20.18g/mol(6.0x10^23 particles/mol)
Which of the following best helps to explain why the electron affinity of Br has a greater
magnitude than that of I? - Answer✔There is a greater attraction between an added electron
and the nucleus in Brthan in I.
A sample of a compound that contains only the elements C, H, and N is completely burned in
O2 to produce 44.0 g of CO2, 45.0 g of H2O, and some NO2 . A possible empirical formula of the
compound is - Answer✔CH5N
The ionization energies for element X are listed in the table above. On the basis of the data,
element Xis most likely to be - Answer✔Al
Which of the following represents an electron configuration that corresponds to the valence
electrons of an element for which there is an especially large jump between the second and
third ionization energies? (Note: n represents a principal quantum number equal to or greater
than 2.) - Answer✔ns2
The elements in which of the following have most nearly the same atomic radius? - Answer✔Cr,
Mn, Fe, Co
Consider atoms of the following elements. Assume that the atoms are in the ground state.
The atom that contains only one electron in the highest occupied energy sublevel - Answer✔Ga
The complete photoelectron spectrum for an element is shown above. Which of the following
observations would provide evidence that the spectrum is consistent with the atomic model of
the element? - Answer✔In its compounds, the element tends to form ions with a charge of +1.
In 1.00 mol of potassium zirconium sulfate trihydrate, K4Zr(SO4)4 • 3 H2O, there are -
Answer✔4 × 6.02 × 10^23 potassium atoms
The photoelectron spectrum for the element nitrogen is represented above. Which of the
following best explains how the spectrum is consistent with the electron shell model of the
atom? - Answer✔The electrons in the 2p sublevel have the smallest binding energy.
Of the following compounds, which is the most ionic? - Answer✔CaCl2
Which of the following compounds contains both ionic and covalent bonds? - Answer✔NH4Cl
The potential energy as a function of internuclear distance for three diatomic molecules, X2, Y2,
and Z2, is shown in the graph above. Based on the data in the graph, which of the following
correctly identifies the diatomic molecules, X2, Y2, and Z2? - Answer✔A
Which of the following correctly indicates whether the solid represented by the particulate
model shown above conducts electricity and explains why or why not? - Answer✔It does not
conduct electricity because its ions cannot move freely within the solid.
2
