Topic 8 - Chemical Analysis

Question 1

How to know if smth’s pure?

Answer 1

Will melt/boil at a specific temp

Question 2

What are formulations?

Answer 2

Mixtures w/ exact amounts of compounds

Question 3

How do component separate in paper chromatography?

Answer 3

Through stationary phase

Question 4

How much time do substances spend in the mobile phase?

Answer 4

Different amounts

Question 5

How does solubility in solvent affect mobile time?

Answer 5

More soluble = more mobile time

Question 6

Rf equation?

Answer 6

Distance travelled by solvent/ distance travelled of water

Question 7

Test for chlorine?

Answer 7

Bleaches damp litmus

Question 8

Test for CO2?

Answer 8

Adding limewater makes it cloudy

Question 9

Test for Hydrogen?

Answer 9

Lit spill squeaky pop

Question 10

Test for sulfate?

Answer 10

Diluate HCl + Barium Chloride solution = white precipitate

Question 11

What are the Halides?

Answer 11

Chlorine, Bromine, Iodine

Question 12

How to teat for Halides?

Answer 12

Nitric acid + silver nitrate

Question 13

Which What colour is silver iodide?

Answer 13

Yellow

Question 14

What colour is silver chloride?

Answer 14

White

Question 15

What colour is silver bromide?

Answer 15

Cream

Question 16

What colour does Lithium burn?

Answer 16

Crimson

Question 17

What colour does sodium burn?

Answer 17

Yellow

Question 18

What colour does potassium burn?

Answer 18

Lilac

Question 19

What colour does calcium burn?

Answer 19

Orange red

Question 20

What colour does copper burn?

Answer 20

Green

Question 21

Calcium and NaOH is

Answer 21

White

Question 22

Copper 2 and NaOH is

Answer 22

Blue

Question 23

Iron 2 and NaOH is

Answer 23

Green

Question 24

Iron 3 and NaOH is

Answer 24

Brown

Question 25

Aluminium and NaOH is

Answer 25

White at first, then colourless solution

Question 26

Magnesium and NaOH is

Answer 26

White