Gen Chem 2 Exam 1 Review

Which one of the following substances will have both dispersion forces and dipole-dipole forces? 

• HCl

• BCl₃

• Br₂

• H₂

• CO₂

Arrange the following substances in order of increasing boiling point: CH₃CH₂OH, HOCH₂CH₂OH, CH₃CH₂Cl, and ClCH₂CH₂OH 

• CH₃CH₂OH < HOCH₂CH₂OH < CH₃CH₂Cl < ClCH₂CH₂OH

• CH₃CH₂Cl < CH₃CH₂OH < ClCH₂CH₂OH < HOCH₂CH₂OH

• CH₃CH₂OH < CH₃CH₂Cl < HOCH₂CH₂OH < ClCH₂CH₂OH

• CH₃CH₂Cl < ClCH₂CH₂OH < CH₃CH₂OH < HOCH₂CH₂OH

• CH₃CH₂OH < ClCH₂CH₂OH < CH₃CH₂Cl < HOCH₂CH₂OH

Which of the following liquids would have the highest viscosity at 25°C? 

• CH₃OCH₃

• CH₂Cl₂

• C₂H₅OH

• CH₃Br

• HOCH₂CH₂OH

Which of the following characteristics indicates the presence of weak intermolecular forces in a liquid? 

• a low heat of vaporization

• a high critical temperature

• a low vapor pressure

• None of the above.

Which of the following properties indicates the presence of strong intermolecular forces in a liquid? 

• a low heat of vaporization

• a low critical temperature

• a low vapor pressure

• a low boiling point

The intermolecular forces present in HSCH₂CH₂SH include which of the following? I. dipole-dipole

II. ion-dipole

III. dispersion

IV. hydrogen bonding 

• I, II, III, and IV

• I and III

• I, III, and IV

• I and II

• II and IV

Each of the following substances is a liquid at –50°C. Place these liquids in order of increasing vapor pressure: dimethyl ether (CH₃OCH₃), propane (C₃H₈), and ethanol (CH₃CH₂OH)_. 

• ethanol < propane < dimethyl ether

• ethanol < dimethyl ether < propane

•  propane < dimethyl ether < ethanol

• dimethyl ether < ethanol < propane

• propane < ethanol < dimethyl ether

Which of the following would be expected to have the lowest vapor pressure at room temperature? 

• ethanol, bp = 78°C

• methanol, bp = 65°C

• water, bp = 100°C

• acetone, bp = 56°C

Which of following can form hydrogen bonds with water molecules?(1) Na⁺ (2) CH₃COOH (3) C₂H₆ (4) CH₃NH₂

• (1) and (2)

• (1) and (3)

• (2) and (3)

• (2) and (4)

• (3) and (4)

Which one of the following is an example of a covalent network solid? 

• SiO₂

• K

• I₂

• CaCl₂

Answer explanation

silicon, boron, and carbon all form covalent networks