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1.2 Pre-Class Lecture duration 11 minutes 42 seconds 1.2 Pre-Class Lecture 1.2 Pre-Class Lecture	1.2 Pre-Class Lecture things electrons water mass experiment law atoms model composition thursday tuesday wednesday electron carbon oxygen atom structure ratios compounds protons From Leena Nabulsi 0 likes 36 plays 0
1.1 Pre-Class Lecture duration 6 minutes 52 seconds 1.1 Pre-Class Lecture 1.1 Pre-Class Lecture	1.1 Pre-Class Lecture change things chemical properties matter representations cake water elements mixtures mixture lot wednesday glass composition gas color propane chemistry unit From Leena Nabulsi 0 likes 35 plays 0