AP Chemistry Unit 2 AP Exam Prep Quiz

Of the following single bonds, which is the LEAST polar?

O-F

On the basis of the information in the table, which of the following arranges the binary compounds in order of increasing bond polarity?

 

Element	Electronegativity
H	2.1
C	2.5
S	2.5
F	4.0
Cl	3.0
Si	1.8

CH4 < SiCl4 < SF4

The lattice energy of a salt is related to the energy required to separate the ions. For which of the following pairs of ions is the energy that is required to separate the ions largest? (Assume that the distance between the ions in each pair is equal to the sum of the ionic radii).

Mg2+(g) and O2-(g)

The particle-level diagram above represents the structure of a solid KF. Although the molar mass of KCl is greater than that of KF, the density of KCl is actually less than that of KF. Which of the following representations of the structure of KCl best helps to explain this phenomenon?

Which of the diagrams best depicts an alloy of Ni and B?

Select the answer that best fits the statement: Has two lone pairs of electrons.

H2O

For which of the following molecules are resonance structures necessary to describe the bonding satisfactorily?

SO2

Based on the diagram shown, which of the following would have the greatest dipole moment, and why?

 

PCI3, because the Cl atoms draw electron density away from the P atom and the bond dipoles do not cancel one another.

Which molecule has only one double bond?

C2H4

Which of the following has molecules with a pyramidal shape?

NH3(g)