Classify each of the following as an element, a compound, or a mixture:

1.  copper

2. water

3. nitrogen

4. sulfur

5. air

6. sucrose

7. a substance composed of molecules each of which contains two iodine atoms

8. gasoline

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Classify each of the following as an element, a compound, or a mixture:

1.  copper

2. water

3. nitrogen

4. sulfur

5. air

6. sucrose

7. a substance composed of molecules each of which contains two iodine atoms

8. gasoline

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Many of the items you purchase are mixtures of pure compounds. Select three of these commercial products and prepare a list of the ingredients that are pure compounds.

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How does an atom differ from a molecule? In what ways are they similar?

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How do molecules of elements and molecules of compounds differ? In what ways are they similar?

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How does an element differ from a compound? How are they similar?

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How does a homogeneous mixture differ from a pure substance? How are they similar?

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How does a heterogeneous mixture differ from a homogeneous mixture? How are they similar?

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What properties distinguish solids from liquids? Liquids from gases? Solids from gases?

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