During an experiment, a student observes the formation of a precipitate. why does this indicate that a chemical reaction is likely occurring? 1)a solid forms, and there is a change of color. 2)a gas forms, and there is a change of color. 3)a solid forms, and light is emitted. 4)a gas forms, and light is emitted.
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Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.
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Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?
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Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments
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During an experiment, a student observes the formation of a precipitate. why does this indicate that...
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