Chapter 3, 4, 5 quiz Livingston

At what temperature is water at its densest?

4°C

When placed in water, NaOH completely dissociates into Na+ and OH-. Therefore, NaOH is

A strong base

Which of the following is produced by the high surface tension of water?

A water strider can walk across the surface of a small pond.

The clinging unlike (different) molecules to one another is the phenomenon of

Adhesion

When you wash dishes drops of water cling to the surface of a glass. This is an example of

Adhesion

Which of the following completely ionizes in solution and is considered to be a strong acid?

HCl

What determines the cohesiveness of water molecules?

hydrogen bonds

An example of a hydrogen bond is the bond between

the H of one water molecule and the O of another water molecule

Water is able to form hydrogen bonds because

More than one of the above. (Water is polar, oxygen atom is weakly negative, and hydrogen atom is weakly positive)

Which of the following ionizes completely in a solution and is considered a strong base (alkali)?

NaOH

In a single molecule of water, two hydrogen atoms are bonded to a single exygen atom by

Polar Covalent Bonds

Pure, freshly-distilled water has a pH of 7. This means that?

The concentration of H+ ions in the water equals the concentration of OH- ions in the water

Which of the following statements are TRUE about buffer solutions?

They maintain a relatively constant pH when either acids or bases are added to them

Which of the following statements is true about buffer solutions?

They maintain a relatively constant pH when either acids or bases are added to them

Which of the following is a hydrophobic material?

Wax

The slight negative charge at one end of one water molecule is attracted to the slight positive charge of another water molecule. What is this attraction called?

a hydrogen bond

Hydrophic substances such as vegetable oil

nonpolar substances that repel water molecules