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ChemistryAcids and Bases I
Whether maintaining water quality in a fish tank or suffering from acid indigestion, we encounter...
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Earth ScienceEarth's Atmosphere
Earth's atmosphere contains many components that can be measured in different ways. This module describes...
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ChemistryThe Periodic Table of Elements I
The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can...
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