This session is part one of four on the New Science TEKS series for third through fifth grade. In Matter and Energy, participants will begin to understand the new science and engineering practices (SEPs) and updates to the 3-5 content strands. SEP topics will include science and engineering, engineering design process, claim-evidence-reasoning, introduction to recurring themes and concepts, and design problems. Science content topics will include materials, conservation of matter in solutions, relative density, physical states, mixtures, and the water molecule.