Unit 2 AP Chem Review

Unit 2 AP Chem Review

Multiple Choice

Of the following single bonds, which is the least polar

• H-O

• H-F

• H-N

• O-F

Multiple Choice

Of the following compounds, which is the most ionic?

• SiCl₄

• MgCl₂

• CCl4

• BrCl

Multiple Choice

Which of the following can be identified as the bond length based upon this graph of potential energy vs internuclear distance between two atoms?

• The atoms form a bond with a bond length of 30 pm.

• The atoms form a bond with a bond length of 100 pm.

• The atoms form a bond with a bond length of 300 pm.

Multiple Choice

Based on the data, which of the following statements provides the best prediction for the boiling point of NaCl?

• NaCl will have a lower boiling point than NaF because the coulombic attractions are weaker in NaCl than in NaF.

• NaCl will have a boiling point between that of NaF and MgO because the covalent character of the bonds in NaCl is intermediate between that of MgO and NaF

• NaCl will have a higher boiling point than MgO because the ions are spaced farther apart in NaCl.

• NaCl will have a higher boiling point than MgO because the energy required to transfer electrons from the anion to the cation is larger in NaCl than in MgO.

Multiple Choice

Will this solid conduct electricity? Why or why not?

• Yes, it contains positive and negative ions.

• No, it does not contain mobile electrons.

• No, the ions are not free to move around in the solid state.

• Yes, it is made of a metal and a non-metal.

Multiple Choice

Which of the following best explains why aluminum chloride, AlCl₃, would have a much higher lattice energy than sodium chloride, NaCl?

• Aluminum has a higher charge (3+) than sodium (+).

• Aluminum has a higher electronegativity than sodium.

• Sodium chloride is more soluble than aluminum chloride.

• Aluminum is a more massive cation than sodium.

Multiple Choice

Copper atoms (atomic radius = 128pm) and zinc (atomic radius = 138pm) are combined to form the alloy, brass. Which particulate drawing would best represent this alloy?

Practice Compounds

• H₂S

• COCl₂

• CH₃OH

• HCN

• C₂H₄

Multiple Choice

What compound has two lone pairs on the central atom of its lewis dot structure?

• NH₃

• CH₄

• HCN

• H₂S

Multiple Select

Which of the following molecules require resonance structures to display the bonding?

• CO₂

• SO₂

• SO₃

• CCl₄

• C₆H₆

Formal Charge

What is the formal charge on the central N and O?

Sigma and Pi Bonds

• single - sigma

• double = 1 sigma and 1 pi bond

• triple = 1 sigma and 2 pi bonds

Sigma and Pi Bonds

• single - sigma

• double = 1 sigma and 1 pi bond

• triple = 1 sigma and 2 pi bonds

VSEPR, molecular geometry, hybridization, electron geometry, bond angle(s), sigma and pi bonds

• H₂S

• COCl₂

• CH₃OH

• HCN

• C₂H₄