2.2 Properties of Water

Question 1

A molecule in which the charges (–) or (+), are unevenly spread out is said to be

Answer 1

Polar molecule

Question 2

The pull between a
partially positive hydrogen atom on one molecule and a partially negative oxygen atom on another is known as a hydrogen bond.

Answer 2

Hydrogen Bond

Question 3

Is the weak chemical bond

Answer 3

Hydrogen Bond

Question 4

Water is what molecule

Answer 4

Polar

Question 5

Molecules of the same substance

Answer 5

Cohesion

Question 6

Molecules of different substances

Answer 6

Ahesion

Question 7

Made up of
elements or compounds that are combined but not bonded together

Answer 7

Mixture

Question 8

Is a mixture in which the
molecules of the mixed substances are evenly spread out

Answer 8

Solution

Question 9

_________are made up of one or more solutes in a solvent.

Answer 9

Solutions

Question 10

________is what is
dissolved.

Answer 10

Solute

Question 11

________ is what does the dissolving.

Answer 11

Solvent

Question 12

Mixtures of water and nondissolved material that do not settle
out are __________.

Answer 12

Suspensions

Question 13

Some important fluids in living things are

Answer 13

Solutions and Suspensions

Question 14

Chemists use a measurement system called the
_____ to show the concentration of H+ ions in solution

Answer 14

Ph Scale

Question 15

Is any compound that releases H+ ions in
solution

Answer 15

Acid

Question 16

A compound that releases hydroxide (OH–
) ions
in solution is called

Answer 16

Base

Question 17

An excellent example of a buffer.

Answer 17

Blood

Question 18

These solutions have pH values below 7.

Answer 18

Acidic solutions

Question 19

These solutions have pH values above 7

Answer 19

Base solutions

Question 20

Strong acids tend to have pH values that range from…

Answer 20

1 to 3

Question 21

Strong bases tend to have pH values ranging from…

Answer 21

11 to 14

Question 22

The pH in most cells in the human body must
stay between

Answer 22

6.5 to 7.5

Question 23

Keeping pH from changing is an important
part of?

Answer 23

Homeostasis

Question 24

One way to control pH is with

Answer 24

buffers

Question 25

What are buffers?

Answer 25

Are weak acids or bases that can react with strong acids and bases to stop sharp.

Question 26

Why is it important for cells to buffer
solutions against rapid changes in pH?

Answer 26

Because buffer plays an important role in keeping homeostasis.

Question 27

_______ stop sudden changes in pH.

Answer 27

Buffers

Question 28

Cells do not dissolve in blood, but they form a
_______ because they do not settle out of the
blood either.

Answer 28

Suspension

Question 29

The water molecule (H2O) is

Answer 29

neutral

Question 30

The substances
are not chemically combined.

Answer 30

mixture

Question 31

What is the greatest solvent on Earth?

Answer 31

Water

Question 32

A water molecule can react to form

Answer 32

Ions

Question 33

Pure water has a pH of

Answer 33

7