AP BIOLOGY UNIT 1 REVIEW

Front

Why can a water strider skate along the top of a pond?

Back

hydrogen bonds result in water cohesion (surface tension)

Front

What word describes when water is attracted to other substances? Options: cohesion, adhesion, capillary action, surface tension

Back

adhesion

Front

What two elements make up water?

Back

Hydrogen and oxygen

Front

Why can water have no net charge but have slight charges in different parts of the molecule?

Back

The oxygen end is slightly negative and the hydrogen end is slightly positive

Front

Attractions between water molecules are called

Back

Hydrogen bonds

Front

The attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attraction to other water molecules.

Back

cohesion

Front

Which is NOT a unique property of water?

Back

Water cools very rapidly.

Front

Why is water polar?

Back

The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.

Front

Molecule in which opposite ends have opposite electric charges

Back

polar molecule

Front

Why does ice float?

Back

As water freezes, it expands and its density decreases.