Understanding Polar and Non-Polar Molecules

What characteristic of water molecules makes them polar?

• They have partial positive and negative charges.

• They are denser than oil.

• They have no charges.

• They are hydrophobic.

Why does oil float on water?

• Oil is more dense than water.

• Oil is hydrophilic.

• Oil is less dense than water.

• Oil has positive charges.

What term describes molecules that are water-loving?

• Polar

• Hydrophilic

• Non-polar

• Hydrophobic

How does soap help oil and water to mix?

• By making oil denser than water.

• By acting as a bridge between their molecules.

• By removing charges from water.

• By making water hydrophobic.

What is the role of soap in the interaction between oil and water?

• It increases the density of oil.

• It makes water non-polar.

• It allows them to mix by bridging their molecules.

• It adds charges to oil.