1. Plastic, wood, and iron are all made up of. Cells Atoms Carbon plants. 2. All of the substances on the periodic table are classified as elements because they. Are pure substances. Are composed of 2 or more different types of atoms. Cannot be broken down into other substances.
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9. A student mixes two clear liquids in a flask as directed by his teacher. A moment later a white solid forms at the bottom of the flask. What can the student conclude from this observation?