Properties

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 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

Attractions between water molecules are called

• Covalent bonds

• Ionic bonds

• Polar bonds

• Hydrogen bonds

Which is NOT a unique property of water?

• Frozen water floats on liquid water.

• Water covers most of the Earth’s surface and retains a large amount of heat.

• Water molecules stick to each other through hydrogen bonds.

• Water cools very rapidly.

Tags

NGSS.MS-ESS2-4

What two elements make up water?

• Helium and oxygen

• Hydrogen and oxygen

• helium and carbon

• oxygen and carbon

Tags

NGSS.MS-ESS2-4

molecule in which opposite ends have opposite electric charges

• cohesion

• polar molecule

• hydrogen bond

• solution

Which characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?

• adhesion

• surface tension

• solvent properties

• nonpolar

What property of water helps to moderate earth's temperature?

• adhesion

• chohesion

• Specific heat capacity

• Latent heat of vaporization

Tags

NGSS.MS-ESS2-4

Which property of these waves differs?

• Frequency

• Wavelength

• Amplitude

• Pitch

Tags

NGSS.MS-PS4-1

A high energy wave is considered to have a high 

• amplitude

• frequency

• wavelength

• period

Tags

NGSS.MS-PS4-1

Which wave has the highest frequency?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS4-1