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Ch 15 - Water and Aqueous Systems

Matching (Value 14)
 
 
Match each item with the correct statement below.
a.
solvation
e.
electrolyte
b.
weak electrolyte
f.
colloid
c.
aqueous solution
g.
surfactant
d.
solvent
 

 1. 

interferes with hydrogen bonding between water molecules
 

 2. 

dissolving medium
 

 3. 

homogeneous mixture of water and dissolved substances
 

 4. 

Solute ions or molecules are surrounded by solvent molecules.
 

 5. 

compound that will conduct current in the liquid state or in aqueous solution
 

 6. 

compound that ionizes incompletely in aqueous solution
 

 7. 

mixture in which particle size averages between 1 nm and 1000 nm
 
 
Match each item with the correct statement below.
a.
dispersed phase
e.
Tyndall effect
b.
surface tension
f.
suspension
c.
Brownian motion
g.
solute
d.
dispersion medium
h.
emulsion
 

 8. 

inward force tending to minimize surface area of a liquid
 

 9. 

dissolved particle
 

 10. 

mixture in which particle size averages greater that 1000 nm in diameter
 

 11. 

Colloidal particles spread throughout a suspension.
 

 12. 

phenomenon observed when beam of light passes through a colloid
 

 13. 

chaotic movement of colloidal particles
 

 14. 

colloid of a liquid in a liquid
 

Multiple Choice (Value 25)
Identify the choice that best completes the statement or answers the question.
 

 15. 

How does the surface tension of water compare with the surface tensions of most other liquids?
a.
It is lower.
b.
It is about the same.
c.
It is higher.
d.
It is higher when a surfactant is added.
 

 16. 

Which of the following is primarily responsible for holding water molecules together in the liquid state?
a.
dispersion forces
c.
ionic bonds
b.
hydrogen bonds
d.
polar covalent bonds
 

 17. 

What is primarily responsible for the surface tension of water?
a.
dispersion forces
c.
ionic attractions
b.
hydrogen bonding
d.
covalent bonding
 

 18. 

Surface tension ____.
a.
is the inward force which tends to minimize the surface area of a liquid
b.
may be increased by detergents
c.
is decreased by hydrogen bonding
d.
causes beads of water to spread out
 

 19. 

Which is responsible for the high thermal energy required to melt ice?
a.
covalent bonding
c.
hydrogen bonding
b.
dispersion forces
d.
ionic attractions
 

 20. 

What is the term for the dissolving medium in a solution?
a.
solvent
c.
solvator
b.
solute
d.
emulsifier
 

 21. 

A solution has which of the following properties?
a.
Gravity separates its parts.
b.
The top layer is different in composition than the bottom layer.
c.
The average diameter of its solute particles usually is less than 1 nm.
d.
A filter can remove the solute.
 

 22. 

Which of the following substances dissolves most readily in gasoline?
a.
CHmc022-1.jpg
c.
NHmc022-2.jpg
b.
HCl
d.
NaBr
 

 23. 

A solution is a mixture ____.
a.
from which the solute can be filtered
b.
that has the same properties throughout
c.
that is heterogeneous
d.
in which a solid solute is always dissolved in a liquid solvent
 

 24. 

Why are two nonpolar substances able to dissolve in each other?
a.
They have similar attractive forces in their molecules.
b.
They combine to produce a polar substance.
c.
There is no attractive force between them.
d.
Nonpolar substances cannot dissolve in each other.
 

 25. 

Which of the following substances dissolves most readily in water?
a.
BaSOmc025-1.jpg
c.
NHmc025-3.jpg
b.
CaCOmc025-2.jpg
d.
CHmc025-4.jpg
 

 26. 

What type of compound is always an electrolyte?
a.
polar covalent
c.
ionic
b.
nonpolar covalent
d.
network solid
 

 27. 

Which of the following compounds conducts electricity only in the molten state?
a.
sodium bromide
c.
calcium hydroxide
b.
magnesium sulfate
d.
barium sulfate
 

 28. 

Which of the following compounds is an electrolyte?
a.
rubbing alcohol
c.
carbon tetrachloride
b.
sugar
d.
sodium hydroxide
 

 29. 

Which of the following compounds is a nonelectrolyte when pure, but an electrolyte when dissolved in water?
a.
rubbing alcohol
c.
carbon tetrachloride
b.
sugar
d.
ammonia
 

 30. 

Which of the following are weak electrolytes in water?
a.
ionic compounds that partially dissociate in water
b.
ionic compounds that are soluble
c.
polar compounds that ionize
d.
nonpolar compounds that do not ionize
 

 31. 

Which of the following compounds is a weak electrolyte?
a.
NaBr
c.
KOH
b.
HBr
d.
NHmc031-1.jpg
 

 32. 

Which of the following is NOT a common hydrate?
a.
Epsom salt
c.
sugar
b.
borax
d.
alum
 

 33. 

Which symbol is used to connect the formula of the compound with the number of water molecules in a hydrate?
a.
a parenthesis
c.
a multiplication symbol
b.
an asterisk
d.
a dot
 

 34. 

What is another term for the water of hydration?
a.
water of solvation
c.
water of sublimation
b.
water of crystallization
d.
water of efflorescence
 

 35. 

Which of the following mixture types is characterized by the settling of particles?
a.
solution
c.
colloid
b.
suspension
d.
hydrate
 

 36. 

Which of the following mixture types can be filtered to remove solute?
a.
suspensions only
c.
suspensions and colloids
b.
colloids only
d.
suspensions and solutions
 

 37. 

Which of the following materials is NOT a colloid?
a.
glue
c.
smoke
b.
alloy
d.
muddy water
 

 38. 

Which of the following mixtures is NOT a colloid?
a.
fog
c.
paint
b.
milk
d.
sugar water
 

 39. 

What is the size range of particles in a colloid?
a.
more than 1000 nm
c.
between 1 nm and 1000 nm
b.
between 100 nm and 1000 nm
d.
between 1 nm and 10 nm
 

Numeric Response (Value 1)
 

 40. 

How many nonbonding pairs of electrons are in a water molecule?

 



 
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