Question 1

Which type of intermolecular force is primarily responsible for the interaction between Na+ ions and water molecules, as depicted in the image showing water molecules surrounding Na+ and Cl- ions?

Accepted Answer

Ion-dipole forces

Question 2

The image showing two HCl molecules with a dashed line between them illustrates which of the following concepts?

Accepted Answer

Intermolecular attraction (dipole-dipole force)

Question 3

Based on the image comparing the structures of n-pentane and neopentane, why does n-pentane have a higher boiling point than neopentane?

Accepted Answer

n-Pentane has a larger surface area for intermolecular interactions, leading to stronger dispersion forces.

Question 4

Which of the following molecules can form hydrogen bonds with water, as shown in the image of hydrogen bonding types?

Accepted Answer

HF

Question 5

The image showing a network of water molecules with dashed lines between them represents which property of water?

Accepted Answer

Hydrogen bonding

Question 6

What is the main reason that ice floats on water, as illustrated by the density vs. temperature graph for water and ice?

Accepted Answer

Ice is less dense than liquid water due to its open lattice structure formed by hydrogen bonds.

Question 7

Which type of intermolecular force is present in all molecules, including noble gases, as shown in the image of dispersion forces?

Accepted Answer

London dispersion forces

Question 8

The image showing a polar ethanol molecule inducing a dipole in nonpolar I2 demonstrates which type of intermolecular force?

Accepted Answer

Dipole-induced dipole force

Question 9

Which of the following best explains why water and pentane do not mix, as shown in the image of two separate liquid layers?

Accepted Answer

Water is polar and pentane is nonpolar, so their intermolecular forces are not compatible.

Question 10

The image showing a graph of boiling point versus dipole moment for several molecules demonstrates what trend?

Accepted Answer

Boiling point increases with increasing dipole moment for molecules of similar molar mass.

Question 11

Which type of intermolecular force is the strongest, according to the summary table of IMFs?

Accepted Answer

Ion-dipole

Question 12

The image showing a DNA double helix with dashed lines between base pairs illustrates which type of interaction?

Accepted Answer

Hydrogen bonding

Question 13

Which of the following molecules would have the highest boiling point, based on the images of formaldehyde and ethane?

Accepted Answer

Formaldehyde, because it is polar and has dipole-dipole forces in addition to dispersion forces.

Question 14

Which of the following best describes the interaction between two molecules of CH3CH2OH (ethanol) in the liquid state, as shown in the hydrogen bonding in ethanol image?

Accepted Answer

Hydrogen bonding between the hydrogen of the –OH group and the oxygen of another molecule

Intermolecular Forces: Types, Effects, and Examples

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