AP CHEMISTRY PRACTICE EXAM

AP CHEMISTRY PRACTICE EXAM

• 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

• Substance C6H6(l) C2H5OH(l) CH3OH(l) C2H6O2(l)

Equilibrium Vapor Pressure 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)

• Ion Ionic Radius (pm) Zn2+ 74

Ca2+ 100 Ba2+ 135

Based on the data in the table above, which of the following 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 to water

• Zn(s) is used to reduce other compounds in chemical reactions. If a chemist needs a

substance that is more effective in its reducing ability, which

of the following species would be the best choice?: Na

• 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

• Lewis electron-dot diagrams for CO2 and SO2 are given above. The molecular geometry

and polarity of the two substances are: different because S has a greater number of electron domains (regions of electron density) surrounding it than C has

• carbon
• fluorine
• hydrogen 1 / 2

• nitrogen
• aluminum
• In the ground state, has only 1 electron in a p orbital.
• Has the largest atomic radius.

3. Has the largest value for first ionization energy.: 1. E

• E
• B

8. CO2

B. CH4

C. SF6

D. H2O

E. NH3

4. Which of the molecules is linear?: 4. A

• What is the molality of a 10. % (by weight) C6H2O (MW = 90.) solution?: 1.2 m

• For the isoelectronic series S2-, Cl-, Ar, K+, and Sc3+, which species requires the least

energy to remove an outer electron?: S2-

• A test tube containing CaCO3 is heated until the entire 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 the empty test tube?: 20.08 g

• 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

• As the atomic number of the elements increases down a column: ionization energy

decreases

• A 10.0% sucrose solution has a density of

2.00 g/mL. What is the mass of sucrose dissolved in 1.00 liter of this solution?: 2.00 × 102 g

• A. Wave nature of matter
• Shielding effect
• Pauli Exclusion Principle
• Heisenberg Uncertainty Principle
• Hund's Rule

• States that the more precisely the position of an electron is determined, the less precisely
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