C8-chemical Analysis

Question 1

What is a pure substance

Answer 1

Contains one compound or element throughout

Question 2

How do you tell how pure a substance is

Answer 2

Boiling point or melting point

Question 3

What is test for hydrogen

Answer 3

Lit splint - squeaky pop

Question 4

What is test for oxygen

Answer 4

Glowing splint relights

Question 5

What is test for chlorine

Answer 5

Damp litmus paper
Colours turns form blue to white

Question 6

What is test for carbon dioxide

Answer 6

Put in limewater
Causes it to go cloudy

Question 7

What is chromatography

Answer 7

A separation technique used to separate mixtures of soluble substances

Question 8

Chromatography uses two phases, what are they and explain them

Answer 8

Mobile phase - molecules can move - for liquid or a gas

Stationary phase - molecules cannot move - for solid or really thick liquid

Question 9

How do you calculate rf value

Answer 9

Distance travelled by substance/distance travelled by solvent