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AP CHEMISTRY PRACTICE EXAM ( Latest 2024 / 2025 ) Actual Questions and Answers 100% Correct
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AP CHEMISTRY PRACTICE EXAM ( Latest 2024 / 2025 ) Actual Questions and Answers 100% Correct
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AP CHEMISTRY PRACTICE EXAM1. Complete combustion of a sample of a hydrocarbon in excess oxygen produces equimolar
quantities of carbon dioxide and water.Which of the following could be the molecular formula
of the compound?: C4H8
2. SubstanceC6H6(l) C2H5OH(l) CH3OH(l) C2H6O2(l)
Equilibrium VaporPressure at 20°C (torr)
75
44
92
0.06
Based on the data in the table above, which of the following liquid substances has the weakest
intermolecular forces?: CH3OH(l)
3. Ion Ionic Radius (pm)Zn2+ 74
Ca2+ 100
Ba2+ 135
Based on the data in the table above, which of thefollowing correctly predicts the relative
strength of the attraction of Zn2+, Ca2+, and Ba2+ ions to water molecules in a solution, from
strongest to weakest, and provides the correct reason?: Zn2+ > Ca2+ > Ba2+ because the
smaller ions have a stronger coulombic attraction towater
4. Zn(s) is used to reduce other compounds in chemical reactions. If a chemist needs a
substancethat is more effective in its reducing ability, which
of the following species would be the best choice?: Na
5. The mass percent of carbon in pure glucose, C6H12O6, is 40.0 percent. A chemist
analyzes an impure sample of glucose and determines that the mass percent of carbon is 38.2
percent. Which of the following impurities could account for the low mass percent of carbon
in the sample?: Water, H2O
6. Lewis electron-dot diagrams for CO2 and SO2are given above. The molecular geometry
and polarity of the two substances are: different because S has a greater number ofelectron
domains (regions of electron density) surrounding it than C has
7. A. carbon
B. fluorine
C. hydrogen
, D. nitrogen
E. aluminum
1. In the ground state, has only 1 electron in a porbital.
2. Has the largest atomic radius.
3. Has the largest value for first ionization energy.: 1. E
2. E
3. B
8. CO2
B. CH4
C. SF6
D. H2O
E. NH3
4. Which of the molecules is linear?: 4. A
9. What is the molality of a 10. % (by weight) C6H2O(MW = 90.) solution?: 1.2 m
10. For the isoelectronic series S2-, Cl-, Ar, K+, andSc3+, which species requires the least
energy to remove an outer electron?: S2-
11. A test tube containing CaCO3 is heated until theentire compound decomposes. If the test
tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the
experiment was
4.40 grams, what was the approximate mass of theempty test tube?: 20.08 g
12. When 100 grams of butane gas (C4H10, MW =58.4) is burned in excess oxygen gas, the
theoretical yield of H2O (in grams) is:: 100 x 5 x 18.02/58.14
13. As the atomic number of the elements increasesdown a column: ionization energy
decreases
14. A 10.0% sucrose solution has a density of
2.00 g/mL. What is the mass of sucrose dissolvedin 1.00 liter of this solution?: 2.00 × 102 g
15. A. Wave nature of matter
B. Shielding effect
C. Pauli Exclusion Principle
D. Heisenberg Uncertainty Principle
E. Hund's Rule
53. States that the more precisely the position of anelectron is determined, the less precisely
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