What is a model? Uses familiar ideas to explain unfamiliar facts observed in nature. It can be changed if you get new info.
Chemical Basis of Life. Matter and Energy zMatter- anything that occupies space and has mass ysolid, liquid, gas zMass-amount of matter a substance contains.
Discrete Energy and Radioactivity Unit 7.1. Disclaimer: “We return to this for HL students in Topic 12, but for now it is maybe better to accept that.
chapter 4
