Elements, Compounds, and
Mixtures
1. Which of the bottles pictured
above contain matter?
• All the bottles
contain matter.
2. Which of the bottles contain a single
pure substance?
• Bottles (a) and (b).
3. Explain your answer to question #2.
• Pure substances
include elements
and compounds.
4. How many elements are present in
each molecule of water?
• Two.
5. What is the ratio of hydrogen atoms to
oxygen atoms in a water molecule?
• Two hydrogens
for each oxygen.
6. As you know, ice is frozen water. What would you
expect the ratio of hydrogen atoms to oxygen
atoms to be in a molecule of ice?
• Two hydrogens for each oxygen.
7. Explain your answer to question #6
• Ice and water are the same substance
(H2O)
8. Bottles (c) and (d) both contain mixtures.
How are these mixtures similar?
• They are both
mixtures of
hydrogen and
oxygen.
9. Bottles (c) and (d) both contain mixtures.
How are these mixtures different ?
• The amounts of
hydrogen and
oxygen vary.
10. How can we prove that
saltwater is a mixture?
• By separating it into salt and water
through physical means.
Or
• By having samples of saltwater that
vary in the ratio of salt and water.
11a. Rice Pudding
a. Rice Pudding
Heterogeneous
mixture
b. Copper
b. Copper
Element
c. Propane
c. Propane
C3H8 compound
d. Air
d. Air
Homogeneous
Mixture
(Solution)
e. Magnesium Chloride
e. Magnesium Chloride
MgCl2
compound
f. Mercury
f. Mercury
Element
g. Maple Syrup
g. Maple Syrup
Homogeneous
Mixture
(Solution)
h. Baking Soda
h. Baking Soda
NaHCO3 compound
i. Chex Party Mix
i. Chex Party Mix
Heterogeneous
mixture
j. White Gold
j. White Gold
An alloy of gold and a
white metal such as
nickel or palladium
Homogeneous Mixture
(Solution)