10. Mixtures contain two or more components/substances which are physically combined. Which of the following lists of materials is composed of mixtures?
A rock, coffee, air
C. oxygen, salt, water
B. carbon dioxide, bleach, oil
D. vinegar, 70% alcohol, carbon
11. Mark heated a liquid in a casserole. He forgot to turn off the stove right away and all the liquid was gone. But he noticed that there were some solid materials that settled on the surface of the casserole. What can be inferred from this observation?
A. The liquid was a pure substance.
B. The liquid was composed of a single material
C. The liquid was a mixture with dissolved solid materials.
D. The liquid material was a pure substance because it evaporated.
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Answer:
A rock, coffee, air
C. The liquid was a mixture with dissolved solid materials.