2.2 MHS IB Bio

The oxygen atom in a water molecule has a partial ______ charge.

• negative

• positive

Water is made up of two hydrogen atoms joined by a _______ bond to an oxygen atom.

• covalent

• ionic

• hydrogen

The reason that the hydrogen atoms have a partial positive charge is the electrons are attracted more _________ to the nucleus of the oxygen atom.

• weakly

• strongly

The bonds between different water molecules are ______ bonds.

• covalent

• ionic

• hydrogen

The property of water that results in water molecules "sticking" to one another is called

• cohesion

• adhesion

• high specific heat

• high heat of fusion

The property of water that results in water molecules "sticking" to other charged or polar molecules is

• cohesion

• adhesion

• high specific heat

• high heat of fusion

4.2 Joules of energy is required to raise the temperature of 1g of water 1 degree C. Therefore, water has a high

• specific heat.

• heat of vaporization.

• heat of fusion.

Water has a high heat of vaporization, meaning a lot of energy is needed to change liquid water to a gas. This is due to

• the many hydrogen bonds that need to be broken.

• the non-polar end of the molecule attracting the polar end.

• the solvent properties of water.

T/F: Water is a good solvent because the polarity of the molecule can interrupt intramolecular forces, resulting in the disassociation of atoms.

• True

• False

An example of a hydrophobic molecule is

• oil.

• salt.

• glucose.

• cellulose.