c7

Question 1

what is a pure substance?

Answer 1

something that only contains one compound or element

Question 2

how do you know if something is a pure substance?

Answer 2

melts or boils at a specific temperature

Question 3

what is a formulation?

Answer 3

mixtures with exact amount of components

Question 4

what are the 2 phases of paper chromatography?

Answer 4

mobile phase - molecules can move
stationary phases - molecules cant move

Question 5

what are the tests for gases?

Answer 5

chlorine - bleaches litmus paper turning it white
oxygen - glowing splint and oxygen will relight it
carbon dioxide - cloudy solution
hydrogen - squeaky pop