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April 6, 2020, 1 p.m.

DGT Some Basic Concepts of Chemistry

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April 6, 2020, 12:59 p.m.

DGT S Block Elements

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April 6, 2020, 12:58 p.m.

DGT Redox Reaction

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April 6, 2020, 12:58 p.m.

DGT Nature of Chemical Bond

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April 6, 2020, 12:56 p.m.

DGT Hydrogen

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April 6, 2020, 12:56 p.m.

DGT Basic Principles and Tech in Organic Chem