Intermolecular Forces

Question 1

Intermolecular forces

Answer 1

Forces of attraction between two separate molecule.

Question 2

Dispersion forces

Answer 2

-Forces of attraction between the temporary dipoles of two molecules.
-Exists between all molecules because polar and non-polar molecules can form temporary dipoles. (NON POLAR MOLECULES ONLY FORM DISPERSION FORCES)
-Formed by electrons coincidentally moving to opposite sides, and they temporary attract others similar.
-weak,easily broken and temporary.

Question 3

What are factors that affect dispersion forces?

Answer 3

Size of molecule increases- measured through molecular mass, the dispersion force strength increases because there are more electrons available to form temporary dipoles with.
Branching increases: dispersion force strength decreases because the branches prevent the molecule from compacting, increasing the distance between molecules, weakening the attractions.

Question 4

Dipole-dipole attractions

Answer 4

-Are the forces of attraction that arise between the permanent dipoles of polar molecules.
-Are stronger than dispersion forces because the dipoles are usually larger and more stable.
-The more polar the particle the stronger the dipole dipole attractions are.

Question 5

Hydrogen bonds

Answer 5

Particular strong dipole-dipole attractions formed whenever hydrogen is bonded with either n,O,F.
Strongest bond