4.2.2 - Simple Molecular Substances

Question 1

Are intermolecular forces weak or strong !?

Answer 1

. Intermolecular forces are weak

Question 2

Although simple molecules contain very strong covalent bonds, there are also…

Answer 2

. …WEAK INTERMOLECULAR FORCES between the molecules

Question 3

What happens to the intermolecular forces when simple molecular substances boil !?

Answer 3

. The weak Inter Molecular Forces break

Question 4

What happens to the STRENGTH of the weak intermolecular forces when MOLECULAR MASS INCREASES !?

Answer 4

. As molecular mass increases, so does the strength of the weak intermolecular forces (this results in the boiling point increasing)

Question 5

What does ELECTRICAL CONDUCTIVITY require !?

Answer 5

. Electrical conductivity requires CHARGED PARTICLES that can MOVE FREELY

Question 6

Do simple molecular substances conduct !?

Answer 6

. Simple molecular substances NEVER CONDUCT electricity because MOLECULES ARE NEUTRAL

Question 7

Is C60 FULLERENE a simple molecule !?

Answer 7

. Fullerene is a unique simple molecule

Question 8

Why is C60 FULLERENE a unique simple molecule !?

Answer 8

. It’s a soft and slippery solid because the molecules can roll over each other easily

. It’s an electrical insulator

. Boiling point is low, not as low as other molecules because of its HIGH MOLECULAR MASS