Name________________________
Period ___________
Date__________
Elements, Compounds and Mixtures
1. Classify each of the following as elements (E), compounds (C), Heterogeneous mixture
(HM) or homogenous mixture (S). Write the letter X if it is none of these.
__Diamond
(C)
__Water (H2O)
__Dry Ice (CO2)
__Sugar (C6H12O6)
__Alcohol (CH3OH)
__Baking Soda (NaHCO3)
__Milk
__Pail of Garbage
__Titanium (Ti)
__Air
_Ammonia (NH3)
__Iron (Fe)
__Sulfuric Acid (H2SO4)
__Salt (NaCl)
__Popcorn and seeds
__Gasoline
__Noodle Soup
__Gold (Au)
__Krypton (K)
__Wood
__Book
__Bismuth (Bi)
__Salt Water
__A dog
__Uranium (U)
__Ink
__Concrete
2. Match each diagram with its correct description. Diagrams will be used once.
A
B
C
D
_C_ Pure Element – only one type of atom present.
__ Mixture of two elements – two types of uncombined atoms present.
__ Pure compound – only one type of compound present.
__ Mixture of two compounds – two types of compounds present.
__ Mixture of a compound and an element.
E
3. Read each description and determine whether it is a pure substance or mixture. Then
further classify the matter (element, compound, homogeneous mixture, heterogeneous
mixture)
Description
1. Chocolate syrup is added to milk and stirred
2. Copper metal (used to make wires)
3. Sand is added to water
4. Distilled water
5. Tap water
Pure Substance
or Mixture?
Mixture
Pure substance
Mixture
Pure substance
Mixture
Classification?
Homogenous
mixture (solution)
Element
Heterogeneous
Mixture
Compound
Heterogeneous
mixture
6. Diamond
Pure substance
Element
7. Table sugar
Pure substance
Compound
8. Table sugar added to a cup of coffee and stirred
Mixture
Homogeneous
mixture (solution)
9. Kool-aid is added to water
Mixture
Homogeneous
mixture (solution)
10. Coca-cola
Mixture
Homogeneous
mixture
11. Helium gas (used to inflate a balloon)
Pure substance
Element
12. Mercury metal (used in old thermometers)
Pure substance
Element
13. Hydrogen gas (an explosive gas)
Pure substance
Element
14. Trail mix (peanuts, pretzels and m&m's)
15. The air we breathe
Mixture
Heterogeneous
mixture
Mixture
Homogeneous
mixture (solution)
4. Define each separation technique. Then come up with 3 everyday examples for each.
a. Filtration is____________________________________________________
_____________________________________________________________
i. ____________________________________________________________
____________________________________________________________
____________________________________________________________
ii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
iii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
b. Crystallization is____________________________________________________
_____________________________________________________________
i. ____________________________________________________________
____________________________________________________________
____________________________________________________________
ii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
iii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
c. Distillation is____________________________________________________
_____________________________________________________________
i. ____________________________________________________________
____________________________________________________________
____________________________________________________________
ii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
iii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
d. Chromatography is__________________________________________________
_____________________________________________________________
i. ____________________________________________________________
____________________________________________________________
____________________________________________________________
ii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
iii. ____________________________________________________________
____________________________________________________________
____________________________________________________________
5. Classify the following changes as Chemical or Physical Changes, and provide a reason
for your answer:
Change
Chemical or Physical
Reason
You cut your hair
Physical
It’s still hair
Mixing sugar and water
Physical
Even if sugar is dissolved in water, it’s still
the same substance. No new substance is
created.
Making a peanut, pretzel and
cereal mixture
Physical
Still peanuts, pretzels and cereal
Baking soda reacts with
vinegar and forms a gas
Chemical
Difficult to reverse, gas is formed
A piece of metal is bent in
half
Physical
Able to bend it back to its original form
Methanol is burned and
leaves a residue
Chemical
Unable to reverse
New substance is formed
An aspirin is crushed into
fine powder
Physical
Changing from solid into powder but still
aspirin
Copper turns green when
exposed to the environment
Chemical
Colour change, new substance is formed
Two clear liquids are mixed
and a yellow color forms
Chemical
Colour change
Baking cookies
Chemical
Hard to reverse
Diamonds are used to scratch
glass
Physical
Can fix the glass, still glass
A tree burns to form ashes
Chemical
Can’t reverse this, new substance is formed
(soot)
Water freezes to form ice
Physical
Can reverse by melting
Glass Breaking
Physical
Can fix the glass, still glass
Water evaporates into steam
Physical
Reverse by condensation, still water
6. It wouldn’t make much sense to measure a teardrop by the kiloliter or Mr. Cirello by the
mile. Using the metric system come up with something you would measure that would
be appropriate considering the prefix.
Kilo
Base
unit
milli
7. How many/much of a decade(s) are in ONE second? Must use dimensional analysis
(hint: which is the given and which is the unknown?)
8. Rewrite each of the following in proper scientific notation, including only the significant
figures.
a.
b.
c.
d.
60 212 000 000 : ____________________________
0.0012305000 : _____________________________
27185
: _____________________________
0.0021530
: ______________________________
9. A golden-colored cube is handed to you. The person wants you to buy it for $100, saying
that is a gold nugget. You pull out your old geology text and look up gold in the mineral
table, and read that its density is 19.3 g/cm3. You measure the cube and find that it is 2
cm on each side, and weighs 40 g. What is its density? Is it gold? Should you buy it?