c7 Flashcards
purity and formulations
1
Q
what is a pure substance?
A
something that only contains one compound or element
2
Q
how do you know if something is a pure substance?
A
melts or boils at a specific temperature
3
Q
what is a formulation?
A
mixtures with exact amount of components
4
Q
what are the 2 phases of paper chromatography?
A
mobile phase - molecules can move
stationary phases - molecules cant move
5
Q
what are the tests for gases?
A
chlorine - bleaches litmus paper turning it white
oxygen - glowing splint and oxygen will relight it
carbon dioxide - cloudy solution
hydrogen - squeaky pop
