chemical analysis

Question 1

pure substances

Answer 1

have specific melting/boiling points which can be used to test for them

Question 2

formulations

Answer 2

Mixtures designed as a useful product

Question 3

examples of formulations

Answer 3

paints
fuels
alloys
fertilisers

Question 4

chromatography

Answer 4

the separating of mixtures to identify its constituent substances
eg pigments in ink, drugs in a urine sample

Question 5

mobile phase in chromatography

Answer 5

solvent eg water

Question 6

stationary phase in chromatography

Answer 6

filter paper

Question 7

how does chromatography work

Answer 7

the mobile phase moves up the stationary phase due to capillary action

this pulls the substances in the mixture upwards with the lighter particles being moved further up the stationary phase

the starting line is drawn just above the water line, in pencil. all measurements are made from this

Question 8

equation linking rf value, distance of substance moved and distance of mobile phase moved

Answer 8

rf value=distance substance moved/distance mobile phase moved

Question 9

test for hydrogen
And Results

Answer 9

Put a little splint into a sample of the gas

If hydrogen is present it burns with a squeky pop sound

Question 10

test for carbon dioxide

Answer 10

causes limewater to turn cloudy when bubbled through it

Question 11

test for chlorine

Answer 11

bleaches blue litmus paper turning it white