Properties of Water

What word describes when water is attracted to other substances?

• cohesion

• adhesion

• capillary action

• surface tension

What two elements make up water?

• Helium and oxygen

• Hydrogen and oxygen

• helium and carbon

• oxygen and carbon

molecule in which opposite ends have opposite electric charges

• cohesion

• polar molecule

• hydrogen bond

• solution

When water and other liquids stick together to form drops or thin films called ________________.

• adhesion

• capillary action

• cohesion

• surface tension

Why does ice float?

• As water freezes, it expands and its density decreases.

• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.

• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.

• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

The reason the water balloon did NOT pop while held over a flame is water's _________.

• Less dense than air.

• Hydrogen bonds between water molecules.

• polarity.

• high specific heat capacity.

Water is a universal solvent because it...

• It can be found anywhere

• It freezes when it gets cold

• floats when frozen

• Dissolves most substances

The fact that ice floats on liquid water is due to the fact that water's solid is ___________ than it's liquid form

• less polar

• more polar

• less dense

• more dense

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
  

A general definition of cohesion is the attraction of:

• particles of the same substance

• particles of a different substance

• particles of both the same and different substances

• particles of neither the same or different substances