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