3.2 Intermolecular Forces & Coulomb's Law

What results when equal but opposite charges are present in two regions of a polar molecule?

• dipole

• ionic bond

• electron sea

• crystal lattice

The electrical force, F, between two point charges is directly related to the product of the charges and inversely related to the distance between them. What happens to an electrical force if the distance between two charges doubles while all other factors remain constant?

• 2F

• 4F

• 1/2 F

• 1/4 F

Of the three molecules O₂, HCl, and F₂, which one has the potential to be polar? Refer to the periodic table.

• F₂

• O₂

• HCl

• They all have the potential to be polar.

Which reason explains why the boiling point of water (H₂O) is higher than the boiling point of hydrogen sulfide (H₂S)?

• ionic bonding

• covalent bonding

• hydrogen bonding

• London dispersion forces

Which action is done by the slightly charged parts of a water molecule in a salt solution?

• They attract nonpolar molecules.

• They attract the ions in ionic compounds.

• They form ionic bonds with other water molecules.

• They form ionic bonds with ions in ionic compounds.

What can explain the mosquito standing on water without sinking?

• Strong intermolecular hydrogen bonds that cause surface tension

• the mosquito is overpowered and can do miracles

• the water has a crystalline structure

• water has a high boiling point

The unit of a +ve or -ve charge is

• coulomb

• volt

• amper

• watt

If the charge increases, what happens to the force?

• increases

• decreases

• stays the same

• can't be determained

What is the value of the constant k in coulombs law?

• k = 20.4 × 10 9 N ⋅ m 2 /C 2

• k = 8.99 × 10 9 N ⋅ m 2 /C 2

• k = 8.99 × 10 9 N ⋅ C 2 /m 2

• k = different every time

If the distance between the two charges increases the force in newtons:

• decreases

• increases

• stays the same

• can't be determined