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ChemistrySubstances
This module explores substances through hypothetical and real-world examples. Substances are broadly classified as pure...
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ChemistryThe Periodic Table of Elements II
This module traces the history of the periodic table of the elements. In the mid-1800s,...
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Scientists and ResearchFrance Anne-Dominic Córdova
This module profiles the career of astrophysicist France Córdova, director of the National Science Foundation....
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