C8- Purity And Formulations

Question 1

Purity in chemistry

Answer 1

Something that only contains one compound or element throughout

Question 2

How boiling or melting point tells you how pure a substance is

Answer 2

Will melt or boil at a specific temperature, the closer to actual melting or boiling point the purer it is

Question 3

Formulations

Answer 3

Useful mixtures with a precise purpose

Question 4

Chromotography

Answer 4

Analytical method used to seperate the substances in a mixture

Question 5

Two phases of chromatography

Answer 5

Mobile phase- where molecules can move. This is always liquid or gas
Stationary phase- where molecules can’t move. This can be a solid or a really thick liquid

Question 6

Molecules in paper chromatography

Answer 6

Molecules with higher solubility which are less attracted to the paper will spend more time in the mobile phase and go further up the paper

Question 7

Chlorine test

Answer 7

Chlorine test bleached damp litmus paper, turning it white

Question 8

Oxygen test

Answer 8

If you put glowing splint inside a test tube containing oxygen, the oxygen will relight the glowing splint

Question 9

Carbon dioxide test

Answer 9

Bubbling carbon dioxide through an aqeous solution of limewater causes solution to turn cloudy

Question 10

Hydrogen test

Answer 10

Hold lit splint at open end of a test tube containg hydrogen, you’ll get a sqeaky pop (the noise comes from the hydrogen burning quickly with the oxygen in the wir to form H2O)