Download pretest_posttest - Understanding Science Using NOS

PRETEST/POSTTEST
PROPERTIES OF WATER
1. Water is essential for life. Its special properties make water the single most
important molecule in plant life. Which of the following properties of water
enables it to move from the roots to the leaves of plants?
A. Water expands as it freezes.
B. Water is an excellent solvent.
C. Water exhibits cohesive behavior.
D. Water is able to moderate temperature.
2. Large bodies of water, such as lakes and oceans, do not quickly fluctuate in
temperature. What is the reason for this phenomenon?
A. Water is an acid.
B. Water is a versatile solvent.
C. Water has a high heat capacity.
D. Water acts as a buffer.
3. Why does ice stay at the top of oceans instead of sinking to the bottom?
A. Ice is colder than liquid water.
B. Ice is less dense than liquid water.
C. Ice is more dense than liquid water.
D. Ice is warmer than liquid water.
4. Water is often called the "universal solvent" because many substances can be
dissolved in water. What property of water allows it to be such a versatile
solvent?
A. purity
B. polarity and cohesion
C. high heat capacity
D. expansion upon freezing
5. Some adult insects are unable to swim but are able to walk on top of water.
What characteristic of water enables these insects to walk on top of water?
A. pH
B. solvent properties
C. atomic bonds
D. surface tension
6. Which term refers to water’s attraction to other substances that have full or partial
electrical charges?
A. polarity
B. adhesion
C. cohesion
D. solvent
E. density
7. A general definition for “cohesion” is the attraction of:
A. particles of the same substance
B. particles of different substances
C. particles of both the same and different substances
D. particles of neither the same nor different substances
8. Which term refers to water having partial positive charges and a partial negative
charge?
A. cohesion
B. surface tension
C. polarity
D. good solvent
E. adhesion
9. Which term refers to water’s attraction to different substances?
A. polarity
B. cohesion
C. surface tension
D. good solvent
E. adhesion
10. Which term refers to the fact that water can dissolve polar molecules like sugar
or ionic substances like salt?
A. surface tension
B. good solvent
C. polarity
D. adhesion
E. cohesion
11. Which characteristic of water allows a paperclip to remain “floating” on water
when the paperclip is gently placed on top of the water (even though paperclips
are denser than water)?
A. adhesion
B. surface tension
C. solvent properties
D. nonpolar
E. inorganic
KEY TO CORRECTION
1. C
2. C
3. B
4. B
5. D
6. B
7. A
8. C
9. E
10. B
11. B