Properties of Water

What does it mean when we say that a molecule is POLAR?

• • The molecule has an unequal sharing of electrons among atoms.

• • The molecule has an equal sharing of electrons among atoms.

• • The molecule has multiple types of bonds among atoms.

which is true?

• • Oxygen is positive and hydrogen is negative.

• • Oxygen is positive and hydrogen is positive.

• • Oxygen is negative and hydrogen is positive.

What characteristic of water molecules allows them to form hydrogen bonds with each other?

• Their linear shape.

• Their nonpolar nature.

• The equal sharing of electrons between oxygen and hydrogen.

• The unequal sharing of electrons, creating partial positive and negative charges.

Bonds among water molecules are called 

• • covalent bonds

• • hydrogen bonds

• • poler bonds

When water molecules stick to each other its called _________.

• • cohesion

• • adhesion

When water molecules stick to other things it is called _______.

• • cohesion

• • adhesion

What is an example of adhesion in a plant?

• • Water bonded to the xylem

• • Water bonded to water

What is an example of cohesion in a plant?

• Water bonded to the xylem

• Water bonded to water

How do water molecules move upwards through the xylem in tall plants, defying gravity?

• Through active transport, using cellular energy.

• By sticking to the xylem walls and to each other.

• Due to the plant's internal pump system.

• Water molecules are pushed up by root pressure.

Some insects can walk on water because of surface tension.

• true

• false