Free Practice Quiz Question List

4 Molecular Structure and Polarity Online Quiz Questions

Use this free practice quiz with 20 questions to review 4 Molecular Structure and Polarity, test your knowledge, and prepare for your next test or exam.

20 questions

Written response

1 point

What is the approximate ideal bond angle for trigonal planar geometry? Give the value in degrees.

Written response

1 point

What term describes the separation of charge across a covalent bond when its atoms attract shared electrons unequally?

True or false

1 point

Lone pairs on a central atom affect molecular shape, even though they are not included in the name of the molecular geometry.

A
True
B
False

Choose one

1 point

A central atom has two single bonds, one triple bond, and one lone pair. What is its electron-pair geometry?

A
Linear
B
Tetrahedral
C
Trigonal planar
D
Trigonal bipyramidal

Choose one

1 point

In VSEPR notation, what is the molecular geometry of AX₃E?

A
Tetrahedral
B
Trigonal planar
C
Trigonal pyramidal
D
Bent

Fill in the blank

1 point

In a polar covalent bond, the more electronegative atom carries a charge, while the other atom carries a charge.

Fill in the blank

1 point

Electron-pair geometry describes the arrangement of around the central atom, while molecular geometry describes the arrangement of only.

Choose all

1 point

Select all molecules in this list that are nonpolar despite having polar bonds.

A
CO₂
B
CCl₄
C
H₂O
D
CH₃Cl

Choose all

1 point

Select all statements about intermolecular forces that are supported by the material.

A
All molecules experience London dispersion forces.
B
Polar molecules can attract one another through dipole–dipole forces.
C
A molecule with hydrogen directly bonded to N, O, or F can form hydrogen bonds.
D
A molecule with polar bonds must be polar overall.
E
London dispersion forces occur only in nonpolar molecules.

Written response

1 point

What intermolecular force is experienced by all molecules?

Choose one

1 point

Which change would generally strengthen London dispersion forces between particles?

A
Smaller electron clouds that are harder to distort
B
Larger electron clouds that are more easily distorted
C
A greater number of lone pairs on the central atom
D
A more symmetrical molecular shape

Open ended

1 point

Explain why polarity is a useful but not absolute guide to whether a substance will dissolve in a solvent. Include the role of attractions between particles and at least one other factor that can matter.

Written response

1 point

According to VSEPR theory, how many electron-density regions does a triple bond contribute around the central atom?

Choose one

1 point

An atom has three bonded atoms and one lone pair, represented as AX₃E. What is its molecular geometry?

A
Trigonal planar
B
Trigonal pyramidal
C
Tetrahedral
D
Bent

True or false

1 point

Only polar molecules experience London dispersion forces.

A
True
B
False

Choose one

1 point

Which substance can form hydrogen bonds between its molecules, based on the bonds in each molecule?

A
CH₄
B
CO₂
C
Ethanol
D
CH₃Cl

Choose one

1 point

Two nonpolar molecules are otherwise comparable, but one has a larger, more easily distorted electron cloud. Which is expected to have stronger London dispersion forces?

A
The molecule with the smaller, less easily distorted electron cloud
B
The molecule with the larger, more easily distorted electron cloud
C
Both must have equal dispersion forces because both are nonpolar
D
Neither molecule experiences dispersion forces

Choose one

1 point

CO₂ has polar C=O bonds. Why is the molecule nevertheless nonpolar?

A
It is polar because its C=O bonds are polar.
B
It is polar because every molecule with more than one atom has a net dipole.
C
It is nonpolar because its linear shape makes the C=O bond dipoles cancel.
D
It is nonpolar because its C=O bonds are nonpolar.

Choose one

1 point

Propane and dimethyl ether have similar molar masses. Which is expected to have the higher boiling point, and why?

A
Propane, because nonpolar molecules always have stronger attractions than polar molecules.
B
Dimethyl ether, because its dipole–dipole attractions add to dispersion forces.
C
They must have identical boiling points because their molar masses are similar.
D
Propane, because it can form hydrogen bonds.

True or false

1 point

A student claims that a Lewis structure alone shows the three-dimensional geometry of a molecule. Is the claim correct?

A
True
B
False