Chemistry Chapter 21A and 21B Powerpoint Notes. Copy into your Chemistry Interactive Notebook (INB) on the input side (page 29) and be sure to tab for multiple pages of notes. Be sure to complete the Step up to Writing (SUTW) assignment which should go on the output side (page 28) across from the notes. Both Chapter 21A and 21B Notes and Chapter 21 SUTW are due on Monday, September 18, 2017 at the beginning of your regular class.