Chemistry 115 - Final Exam 100% Updated!!

What is a pure substance? - ANSWERsubstance made of one element What is a mixture? - ANSWERcombo of pure substances What is a homogenous substance - ANSWERevenly distributed particles at microscopic level Hetergenous - ANSWERparticles are not evenly distributed at the microscopic level - usually can see different particles What are chemical properties? - ANSWERCharges forming compounds reacts inert or not burning What are physical properties? - ANSWERState (solid, liquid, gas) the look (shiny, etc.) color odor Boiling point Fractions of a unit - ANSWERCenti (c) 10-2 milli (m) 10-3 micro (µ) 10-6 nano (n) 10-9 pico (p) 10-12 What is the band of stability? - ANSWERThe more protons there are the more neutrons an atom needs to stabilize. It's the neutron to proton ratio. it goes from 1:1 up to 1.5:1