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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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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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ChemistryProperties of Solids
Solids are formed when the forces holding atoms or molecules together are stronger than the...
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