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"Changes and Properties of Matter" Entering the World of Chemistry PPT Courseware 8
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"Valence" Representation of Chemical Elements and Substance Composition PPT Courseware
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"What changes have occurred in matter" Changes in matter PPT courseware 4
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"Changes of Rice, Starch and Iodine" PPT download of changes in substances
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"Basic Laws of Redox Reactions" Redox Reaction PPT
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"Valence" Representation of Chemical Elements and Substance Composition PPT Courseware
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"Cultural Masterpieces of the World" Brilliant Modern Culture PPT Courseware 4
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"Law of Conservation of Mass" Chemical Changes and Their Representation PPT Courseware 3
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