DATA SHEETS For each reaction, write down your observation(s) before and after the reaction that you believe provide evidence that a chemical change took place. Be clear and concise; use only enough detail to communicate your findings.

EXPERIMENT OBSERVATIONS BEFORE CHANGE AFTER CHANGE TYPE OF CHANGE (Physical or Chemical) A White powder Bubbles B Blank C Cu wirebin flame Bright color orange Cu turns grey D I is purple solid I Solid goes to vapor Test #1 white powder evolution bubble c Test #2 blue sol shiny steel nail Test #3 metallic mg Test #4 BLACK POWDER test gas w, glowing splint flameerupts, oxygen Test #5 white powder gas evolve; test for Co2 burning splint extinguishes Test #6 2 clear sol are combined

Test #7 CaC12 powder into sol Test tube cools Test # 8 Test #9 Hcl; Clear NaHC03; White powder red Test #10 Mg begin grey Mg turns orange deposit how to tell if they chemical or physical reaction,