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Essentials Of Biology Chapter 2--Part 2
Test Description: Part 2 of 2
Instructions: Answer all questions to get your test result.
1) Human body cells are approximately ______ water.
A
50-55%
B
25-35%
C
90-95%
D
70-95%
2) The tendency of molecules of the same kind to stick together is called ______.
A
cohesion
B
polarity
C
bonding
D
adhesion
3) Why (if you are careful) are you able to float a needle on the surface of water?
A
The covalent bonds that hold a water molecule together are responsible for this ability
B
Water has adhesive properties.
C
A single needle is less dense than water.
D
The surface tension that is a result of water's cohesive properties makes this possible.
4) Sweating cools your body by ______.
A
hydrogen bonding
B
radiation
C
cohesion
D
evaporative cooling
5) As water freezes, ______.
A
it loses its polarity
B
it cools the surrounding environment
C
its hydrogen bonds break apart
D
its molecules move farther apart
6) Sugar dissolves when stirred into water. The sugar is the ______, the water is the ______, and the sweetened water is the ______.
A
solution... solute... solvent
B
solvent... solute... solution
C
solution... solvent... solute
D
solute... solvent... solution
7) A base ____________.
A
removes H+ ions from a solution
B
removes OH- ions from a solution
C
removes H2O molecules from a solution
D
decreases the pH of a solution
8) The lower the pH of a solution, the ______.
A
higher the OH— concentration
B
more acidic the solution
C
greater the number of oxygen atoms
D
less toxic the solution
9) What name is given to substances that resist changes in pH?
A
salts
B
buffers
C
bases
D
sugars
10) Household bleach _______________ than household ammonia .
A
is more acidic
B
has 100 times higher H+ concentration
C
has a higher H+ concentration
D
has a lower H+ concentration
11) If the brain is not properly hydrated, ___________________.
A
all of these
B
you may get headaches
C
long-term memory recall is reduced
D
short-term memory is reduced
12) People who exercise regularly ___________________.
A
can learn faster than couch potatoes
B
can increase their IQ scores
C
all of these
D
react to stress better
*select an answer for all questions
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