Question 1

What happens to IMFs when a substance undergoes a phase change?

(e.g., melting to boiling)

Accepted Answer

The IMFs are broken or formed

Question 2

How do IMFs influence a substance's properties?

Accepted Answer

Weak IMFs = High vapor pressure

Strong IMFs = High boiling point, High melting point

(correlation with melting point is more subtle)

Question 3

How do IMFs influence ionic solids?

Accepted Answer

Ions have strong interactions, leading to low vapor pressure, high melting point, and high boiling point

Question 4

Why do covalent network solids have high melting points?

Accepted Answer

They have strong covalent interactions in their 2/3-D networks

Question 5

Why do molecular solids have a low melting point?

Accepted Answer

They have weak covalent IMFs between the individual molecules

Question 6

What do particle diagrams look like for solids, liquids, and gases?

Accepted Answer

Solid is tightly packed; Liquid is more loose; Gas is free flowing

Question 7

What is vapor pressure?

Accepted Answer

The pressure exerted by a liquid in equilibrium with its liquid state

Question 8

What increases vapor pressure?

Accepted Answer

Increased temperature

Increased number of molecules?

(2) Properties of Solids, AP Chemistry Flashcards