Physical Properties

What is the property called when water molecules are attracted to other water molecules?

• adhesion

• cohesion

• nuclear fusion

• erosion

What is the property called when a water molecule is attracted to molecules OTHER than water?

• adhesion

• cohesion

• nuclear fusion

• erosion

Which substance do you suspect you could fit the most drops on the surface of a nickel? (Which is the most polar?)

• water

• olive oil

• vegetable oil

• acetone

Why does oil float on top of water?

• Oil is polar, water is not

• Oil is less dense than water

• Oil is more dense than water

• Oil has much stronger cohesive forces

Tags

NGSS.MS-PS1-2

The increase in strength of cohesion of the water molecules near the interface of air and water is called...

• adhesion

• surface tension

• solubility

• polarity

The cohesion of water molecules at the surface of a body of water...

• adhesion

• surface tension

• solubility

• polarity

When a molecule has two opposite tendencies or two opposite charges we call that...

• density

• cohesion

• polarity

• solubility

A molecule that has a positive charge on one end and a negative charge on the other end

• Polar Molecule
• Adhesive Molecule
• Cohesive Molecule
• Bonded Molecule

Water has the ability to stick to something other than water which is called...

• Adhesion

• Cohesion

• Surface Tension

• Hydrogen Bonds

Water striders can walk across the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds or the cohesive forces holding the water molecules together

• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

Tags

NGSS.MS-PS2-5