Properties of Water
Practice Quiz
1. What two elements make up water?
Hydrogen (H) & Oxygen (O)
2. Write the chemical formula for water.
H2O
3. Is water an element, compound,
or mixture?
Compound
4. Define the term compound.
A substance with two or more elements
chemically combined in definite proportions.
5. What kind of chemical bond exists
between a hydrogen and oxygen
atom in a water molecule?
A covalent bond
6. Draw a model of a water molecule.
(+)
(-)
(+)
The parentheses mean ‘partial.’
(-)
7. Draw partial (+) and partial (-) charges on
the water molecule you drew above.
This symbol also means partial →
δ+
8. Which of the following molecules are polar?
(+)
(-)
(+)
(-)
(-)
(+)
(-)
(-)
water
(-)
(+)
(-)
carbon dioxide
(+)
(+)
ammonia
(+)
(+)
(-)
(+)
(-)
Hydrogen chloride
(-)
(-)
(+)
formaldehyde
(+)
(+)
methane
(+)
9. Draw two water molecules and a hydrogen
bond.
1
The use of dashed lines
show that hydrogen bonds
are relatively weak.
(-)
Hydrogen bond
(+)
4
2
3
10. How many hydrogen bonds can a water
molecule form with other water molecules?
Four
11. What term describes the attraction between
molecules of the same substance?
Cohesion
B
A
No
12. Without a hydrogen bond, when molecule A
moves to the right, will it be able to drag
molecule B along with it?
13. With a hydrogen bond between them, will
molecule A be able to drag molecule B along
with it?
B
A
Yes
14. What are some examples of water cohesion?
Surface tension
Drops on a penny
Insect trapped
in water
A proboscis keeps
this bee at a safe
distance
15. What are some examples where
surface tension breaks down?
“Scaring” pepper
Bread clip motor boat
16. What term describes the attraction between
molecules of different substances?
Adhesion
(+)
(+)
(-)
(+)
(+)
(+)
glass
Water drop on glass slide
17. What will happen when a charged rod or balloon
is brought up close to a stream of water?
The water will be attracted toward the rod
18. What are some examples of water adhesion?
A meniscus that
water forms in a
glass tube.
Capillary action
19. What are some examples of anti-adhesion?
Scotchgard ® carpet
Water on wax paper
Wax-layer on leaves
Duck feathers
repel water
New: Researchers have made an omniphobic
material that repels both water and oil.
Nature has never made this type of material.
20. What is the term which describes the amount of heat
energy needed to increase a substance’s temperature?
Heat Capacity of Various Materials [cal/(g·°C)]
Heat Capacity [cal/(g·°C)]
1.20
1.00
1.00
Heat Capacity
0.80
0.60
0.54
0.42
0.40
0.21
0.20
0.20
0.19
0.12
0.09
0.03
0.00
0.02
21. Which substance in the chart is able to absorb the
most heat for a given change in temperature?
Heat Capacity of Various Materials [cal/(g·°C)]
Heat Capacity [cal/(g·°C)]
1.20
1.00
1.00
Water
0.80
0.60
0.54
0.42
0.40
0.21
0.20
0.20
0.19
0.12
0.09
0.03
0.00
0.02
22. Which substance in the chart is able to absorb the
least amount of heat for a given change in temperature?
Heat Capacity of Various Materials [cal/(g·°C)]
Heat Capacity [cal/(g·°C)]
1.20
1.00
1.00
Air
0.80
0.60
0.54
0.42
0.40
0.21
0.20
0.20
0.19
0.12
0.09
0.03
0.00
0.02
23. What example in the Properties of Water lab
demonstrated a low heat capacity for air and a
high heat capacity for water?
Air-filled balloon
Water-filled balloon
24. What is a mixture?
A substance made up of elements or compounds that are
combined but not chemically bonded together.
25. What are some examples of mixtures?
water
sugar
corn syrup
CO2
caramel
caffeine
citric acid
Beef
Onion
Tomato
Lettuce
Cheese
Ketchup
Mustard
bread
copper
zinc
26. What are two kinds of mixtures made with water?
Solutions and suspensions
27. Compare solvent, solute, and solution.
water
Sugar cubes
Sugar water
solvent
solute
solution
what does the
dissolving
what is being
dissolved
28. Define a solution?
A mixture in which the molecules of the mixed
substances are evenly spread out.
29. Which substance(s) below dissolve in water?
Magnesium
iodine
sulfate
polar
Non polar
salt
paraffin wax
oil
polar
Non polar
Non polar
30. What is a suspension?
A mixture from which some of the nondissolved
particles settle out slowly upon standing.
31. What some examples of suspensions?
Chocolate
milk
Paint
Blood
32. When water breaks apart, what kind of ions
are formed?
Hydrogen (H+) ions and hydroxide (OH-) ions
(+)
(-)
33. What does the pH scale indicate?
It indicates the concentration of
hydrogen ions (H+) in a solution.
34. What is the range of the pH scale?
0 to 14
35. What is the pH of a substance that has an
equal number of H+ and OH- ions?
7
Acids
36. Substances with a pH below 7 are ________
while those above 7 are _________?
Bases
H+
OH- ions?
37. Acids have more ____ions
than _____
lower
38. The _______the
pH, the greater the acidity.
Bases have more OH- ions than H+ ions?
39. _______
40. Place the 5 substances
listed below on the
scale to the right.
Oven cleaner
Soap
Lemon juice
Oven cleaner
Human blood
Soap
Pure water
Human blood
Pure water
Click for answer
Lemon juice
41. The pH in most cells in the human body must
6.5 and______
7.5 ?
stay between _______
Buffers are weak acids or bases that can
42. __________
react with strong acids or bases to stop sharp,
sudden changes in pH.
43. Buffers play an important role in the process of
homeostasis
______________,
where living things are able
to maintain a stable, internal environment.