Chapter 2 Review Sheet
1. Classify the following materials as heterogeneous mixtures, homogeneous
mixtures, compounds, or elements.
a. ink
b. salt
homogeneous
compound
c. milkshake
homogeneous
or heterogeneous
heterogeneous
d. sprite
e. ethanol
f. ice
g. Plutonium
compounds
heterogeneous
or homogeneous
element
h. pond water heterogeneous
2. Classify each as a homogeneous mixture or a heterogeneous mixture.
a. stirred paint
b. granite
c. gasoline
d. multivitamin
e. windshield fluid
ho
het
ho
ho
ho
f. pizza sauce
g. rocky road ice cream
het
het
h. chunky peanut butter
het
i. Diamond
neither (element)
j. Spanish omelet
het
3. Classify the following properties
a. malleable
physical
b. odor
physical
c. expansion
physical
as chemical or physical.
d. reacts with air chemical
e. stability
chemical
f. ductility
physical
4. Classify the following as chemical or physical changes.
a. cloud formation
physical (condensation)
b. burning of coal
chemical (combustion)
c. melting silver
physical
d. distilling water
physical
e. subliming of iodine (solid to gas)
physical
f. flat tire
physical
g. explosion of gas
chemical
h. silver tarnishing
chemical
i. scorching a shirt with an iron
chemical
j. battery leakage
chemical (tough one)
5. Consider three 10 gram samples of water: one as ice, one as a liquid, and
one as vapor. How do the volumes of these three samples compare with
one another? How is this difference in volume related to the physical
state involved?
Vapor is the largest volume, then solid, and liquid is the densest. As
the temperature changes a physical change occurs between the
molecules.
6. Describe how the process of distillation could be used to separate a
solution into its component substances.
Liquids each have their own unique boiling point. If you have a
mixture of several liquids they can be separated by raising the
temperature to the lowest boiling point first and distill off that liquid.
This process can be repeated until each substance has been boiled off
and separated.
7. Describe the process of filtration.
Filtration is only useful for separating solids from solutions (but not
dissolved “solids”.) The mixture of solution and solid is poured into a
cone of filter paper, the solution passes through the filter paper but the
solid particles are too large to go through and remain behind.
8. During a very cold winter, the temperature may remain below the freezing
point for extended periods. However, fallen snow can still disappear, even
though it cannot melt. This is possible because a solid can vaporize
directly, without passing through the liquid state. Is this process
(sublimation) a physical or chemical change?
Physical because it only shows a phase change not a reaction.
9. In gaseous substances, the individual molecules are relatively (close/far
apart) and are moving freely, rapidly, and randomly.
10. The fact that the substance copper (II) sulfate pentahydrate is bright blue
is an example of a __physical __ property.
11. The fact that the substance copper (II) sulfate pentahydrate combines
with ammonia in solution to form a new compound is an example of a
__chemical____ property.