Chemical reactions NGSS activity packet, 39 pages, information, activities, assessments, quiz, vocabulary, teacher notes and guide. NGSS MATTER AND ITS INTERACTIONS MS-PS1. chemistry, chemical reactions, atoms and elements, exothermic reactions, endothermic reactions, chemistry ws, chemistry worksheets, middle school, biologyguy, edwhiteThank you for purchasing this NGSS aligned resource “chemical reactions MS-PS1.B”. This resource includes information and activities, which cover the core ideas