8/15/2019 F4 Chemistry 1/7 8/15/2019 F4 Chemistry 2/7 8/15/2019 F4 Chemistry 3/7 8/15/2019 F4 Chemistry 4/7 8/15/2019 F4 Chemistry 5/7 8/15/2019 F4 Chemistry 6/7 8/15/2019 F4 Chemistry 7/7