Ionic bond Polar covalent bond Nonpolar covalent bond Hydrogen bond

1. A bond in which two atoms share electrons but there is an unequal attraction for the shared electrons is a(n)

A. Ionic bondB. Polar covalent bondC. Nonpolar covalent bondD. Hydrogen bond

Ionic b

ond

Polar covalent b

ond

Nonpolar co

valent b

ond

Hydrogen bond

11%19%

7%

63%

2. A hydrogen bond is aA. The bond between a hydrogen atom and

a oxygen atom in a water moleculeB. The bond between a hydrogen atom and

a nitrogen atom in an ammonia molecule

C. The attraction between opposite poles of polar covalent molecules

D. All of the aboveE. Both A and B

The bond within a water molecule is a polar covalent bond.

A hydrogen bond is an attraction between two different water molecules (or other polar molecules). This attraction occurs because the polar covalent bond creates charged poles in each molecule (oxygen end is negatively charged and hydrogen pole is positively charged.) The oxygen end of one molecule is attracted to a hydrogen end of another.

3. Water molecules stick together, creating surface tension, due to the attraction between opposite poles of water molecules forming hydrogen bonds. This ability to stick together means that water is _______.

A. AdhesiveB. CohesiveC. Hydrophobic

Adhesive

Cohesive

Hydrophobic

33% 33%33%

Cohesion = the attraction between like molecules

Adhesion = the attraction between different types of molecules

Water is both cohesive (between water molecules) and adhesive with many molecules..

4. The term hydrophilic means that a substance

A. is highly reactiveB. Is chemically inert

(does not react)C. is attracted to waterD. Is repelled by water

is highly

reactive

Is chemica

lly in

ert (does..

.

is attracte

d to w

ater

Is repelle

d by water

4%12%

81%

4%

5. Which of following types of substances are hydrophilic?

I. Nonpolar covalentII. Polar covalentIII. Ionic

A. I onlyB. II onlyC. III onlyD. I and IIE. I and IIIF. II and III

I only

II only

III only

I and II

I and III

II and III

0%

23%

50%

12%12%

4%

Since water is a polar molecule, it attracts both ionic compounds (since charged ions are attracted to the partially charge poles of the water molecule) and other polar compounds (since the oppositely charged poles are attracted to water’s charged poles.)

6. A substance that is able to dissolve another substance is called a

A. SoluteB. SolventC. SolutionD. ReactantE. Both A and D

Solute

Solvent

Solution

Reactant

Both A and D

23%

69%

8%

0%0%

7. It takes ____ energy to change water’s temperature compared to most other substances, so water tends to _________A. More, moderate

temperaturesB. More, cause more extreme

temperature changesC. Less, moderate

temperaturesD. Less, cause more extreme

temperature changesMore, m

oderate temper..

.

More, cause

more extre

m...

Less,

moderate te

mperat...

Less,

cause

more extr

em...

72%

4%8%16%

8. A substance with a low pH is _________ and has a higher concentration of ____ ions.

A. Acidic; OH-B. Acidic; H+C. Basic (Alkaline); OH-D. Basic (Alkaline); H+

Acidic;

OH-

Acidic;

H+

Basic (A

lkaline); O

H-

Basic (A

lkaline); H

+

21%

4%13%

63%

9. A substance with a pH of 2 is __ than a substance with a pH of 7.

A. 5 x less acidicB. 5 x more acidicC. 50 x less acidicD. 50 x more acidicE. 100,000 x less acidicF. 100,000 x more acidic

5 x less

acidic

5 x more acid

ic

50 x less

acidic

50 x more acid

ic

100,000 x less

acidic

100,000 x more ac

idic

8% 8%

44%

28%

8%4%

1.B2.C3.B4.C5.F6.B7.A8.B9.F