SOMEONE ANSWER QUICK !!
When a sample of blue crystals is heated, a vapour
is given off and a white powder remains. Analyze
whether a physical or a chemical change occurred.
Give reasons for your answer.
there are two pieces of evedence wich piont that this prosses is a chemical change in color and formation of a new solid whith different color which is why the white powder . therefore the subtance has a new identidty . sorry but i had to piont out some thing white subtance hmm...COCAINE sorry about that
