9.5 Intermolecular Forces

Read the information in the image.

What are the forces called that hold molecules together?

• Intermolecular forces

• Intramolecular forces

• chemical forces

• bonds

• physical forces

Tags

NGSS.HS-PS1-3

What is represented inside each box?

• H2O molecule

• H atom

• O atom

• O2H molecule

• solid water

In relation to the box for molecule 1, where do intramolecular forces exist?

• inside the box

• outside the box

Based on the intramolecular forces for molecule 1, draw similar asterisks (*) for the intramolecular forces on the diagram for molecules 2 and 3.

In relation to the molecule, where do intramolecular forces tend to occur?

• Within the molecule

• Between molecules

Two intermolecular forces exist in this image. Where are they positioned relative to the molecules?

• Between the molecules

• Within the molecules

State, in everyday language, the difference between intermolecular and intramolecular forces in terms of where they occur on the molecular level.

• Intermolecular forces occur between molecules, while intramolecular forces occur within a molecule.

• Intermolecular forces occur within a molecule, while intramolecular forces occur between molecules.

• Both intermolecular and intramolecular forces occur within a molecule.

• Both intermolecular and intramolecular forces occur between molecules.

The diagram here represents an arrangement of five molecules. What is the difference between the two ends of each molecule?

• One side is positively charged, the other side is negatively charged

• Both sides are positively charged

• Both sides are negatively charged

Tags

NGSS.HS-PS1-3

Molecules with the property you identified in the last question are known as dipoles: One side is positive, the other is negative.

Consult with your group and reach a consensus on what you think a dipole is. Write down this definition.

• A dipole is a species/molecule that has one positive end and one negative end

• A dipole is a species/molecule that has two positive ends

• A dipole is a species/molecule that has two negative ends

• A dipole has two ends that are identical (either positive or negative)

Tags

NGSS.HS-PS2-6

Consider the attractive forces shown in this image. In terms of the positive and negative ends of the dipoles, where do attractive forces occur?

• Attractive forces occur between the positive end of one molecule and the negative end of another molecule.

• Attractive forces occur between the positive ends of two molecules.

• Attractive forces occur between the negative ends of two molecules.

• Attractive forces occur between the positive end of a molecule and the negative of the same molecule