Elements, Compounds, and Mixtures

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Elements, Compounds, and Mixtures
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1. Which of the bottles pictured above contain
matter?

• All the bottles contain matter.

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2. Which of the bottles contain a single pure
substance?

• Bottles (a) and (b).

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3. Explain your answer to question 2.

• Pure substances include elements and compounds.

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4. How many elements are present in each molecule
of water?

• Two.

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5. What is the ratio of hydrogen atoms to oxygen
atoms in a water molecule?

• Two hydrogens for each oxygen.

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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)

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8. Bottles (c) and (d) both contain mixtures.
How are these mixtures similar?

• They are both mixtures of hydrogen and oxygen.

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9. Bottles (c) and (d) both contain mixtures.
How are these mixtures different ?

• The amounts of hydrogen and oxygen vary.

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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.

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11a. Rice Pudding
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a. Rice Pudding
Heterogeneous mixture
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b. Copper
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b. Copper
Element
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c. Propane
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c. Propane
C3H8 compound
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d. Air
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d. Air
Homogeneous Mixture (Solution)
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e. Magnesium Chloride
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e. Magnesium Chloride
MgCl2 compound
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f. Mercury
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f. Mercury
Element
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g. Maple Syrup
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g. Maple Syrup
Homogeneous Mixture (Solution)
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h. Baking Soda
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h. Baking Soda
NaHCO3 compound
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i. Chex Party Mix
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i. Chex Party Mix
Heterogeneous mixture
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j. White Gold
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j. White Gold
An alloy of gold and a white metal such as nickel
or palladium Homogeneous Mixture (Solution)