Chemistry quiz 2

You are given 2 samples: saltwater and iron. Classify each as an element, compound, homogeneous mixture, or heterogeneous mixture. Which of the following is the correct classification?

• Saltwater: compound; Iron: homogeneous mixture

• Saltwater: homogeneous mixture; Iron: element

• Saltwater: heterogeneous mixture; Iron: element

• Saltwater: element; Iron: compound

Which statement correctly identifies a characteristic of a heterogeneous mixture and gives an appropriate example?

• Heterogeneous mixtures have a uniform appearance throughout (e.g., air).

• Heterogeneous mixtures have visibly different parts (e.g., vegetable soup).

• Heterogeneous mixtures are always liquids (e.g., saltwater).

• Heterogeneous mixtures are pure substances (e.g., gold).

How many sig figs are there?
100.00

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How many significant figures does the following number have: 0.002040

• 6
• 4
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• 2

How many significant figures: 1000 mL

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