colours to learn

Question 1

what colour is Copper sulfate CuSO4 ?

Answer 1

blue

Question 2

what colour is Copper oxide CuO ?

Answer 2

black

Question 3

what colour is Copper carbonate CuCO3?

Answer 3

green

Question 4

what colour is Copper metal ?

Answer 4

orange/brown

Question 5

what colour is sulfur?

Answer 5

yellow

Question 6

what colour are all the other salts?

Answer 6

white

Question 7

what is the Flame test colour Lithium ions (Li+) ?

Answer 7

red/crimson flame

Question 8

what is the Flame test colour copper (II) ions (Cu2+) ?

Answer 8

blue/green flame

Question 9

what is the Flame test colour potassium ions (K+) ?

Answer 9

lilac flame

Question 10

what is the Flame test colour calcium ions (Ca2+) ?

Answer 10

orange/red flame

Question 11

what is the Flame test colour sodium ions (Na+) ?

Answer 11

yellow

Question 12

what is the Flame colour when sulfur burns ?

Answer 12

blue flame

Question 13

what is the Flame colour when magnesium burns ?

Answer 13

bright white flame

Question 14

what is the colour change for Heating copper carbonate to form copper oxide (thermal decomposition) ?

Answer 14

Green to black

Question 15

what is the colour change for Reducing copper oxide with methane/hydrogen ?

Answer 15

Black to pink/orange

Question 16

what is the colour change for Adding chlorine water to potassium iodide ?

Answer 16

Colourless to red/brown

Question 17

what is the colour change for Adding chlorine water to potassium bromide ?

Answer 17

Colourless to orange

Question 17

what is the colour change for Adding bromine water to potassium iodide ?

Answer 17

colourless to red/brown

Question 18

what is the chemical test for carbonates?

Answer 18

add dilute HCl - to remove any impurities
if carbonates are present then CO2 will be released
test for CO2 by bubbling it through limewater(cloudy = carbonates present)

Question 19

how do you carry out the chemical test for halides? and what are the positive results?

Answer 19

add nitric acid (HNO3)
then add silver nitrate(AgNO3)

if chloride ions are present then a white precipitate will form
if bromide ions are present then a cream precipitate will form
if iodide ions are present then a yellow precipitate will form

Question 20

what is the chemical test for sulfates?

Answer 20

add HCL and then barium chloride to the solution
if sulfates are present, a white precipitate will form

Question 21

how do you test for the presence ofIron (II)??

Answer 21

add sodium hydroxide to solution and if a sludgy green precipitate forms then iron(II) is present

Question 22

how do you test for the presence ofIron (III)??

Answer 22

add sodium hydroxide to solution and if a orange/brown precipitate forms then iron(III) is present

Question 23

how do you test for the presence ofcopper (II)??

Answer 23

add sodium hydroxide to solution and if a blue precipitate forms then copper (II) is present

Question 24

what colour is **methyl orange** in an **acidic** solution?

Answer 24

red

Question 25

what colour is **methyl orange** in an **alkaline** solution?

Answer 25

yellow

Question 26

what colour is **phenolphthalein** in an **acidic** solution?

Answer 26

colourless

Question 27

what colour is **phenolphthalein** in an **alkaline** solution?

Answer 27

pink

Question 28

what colour is **litmus paper** in an **acidic** solution?

Answer 28

red

Question 29

what colour is **litmus paper** in an **alkaline** solution?

Answer 29

blue

Question 30

what state and colour is **chlorine**? what colour is it in **aqueous solution**?

Answer 30

at room temperature it as a gaseous stae and it has a pale green colour but in solution it is colourless

Question 31

what state and colour is **bromine**? what colour is it in **aqueous solution**?

Answer 31

at room temp it is a red/brown liquid in an aqueous solution it is orange

Question 32

what state and colour is **iodine**? what colour is it in **aqueous solution**?

Answer 32

at room temp it is a dark grey solid in aqueous solution it is red/brown

Question 33

what happens when you add bromine water to an **alkene**?

Answer 33

the mixture turns from orange to colourless

Question 34

what happens if you add potassium dichromate to an alcohol?

Answer 34

it turns into a carboxylic acid and the colour change observed is green to orange

Question 35

what is the test for chlorine?

Answer 35

use damp blue litmus paper and it will turn red before bleaching white

Question 36

what is the test for ammonia?

Answer 36

use damp red litmus paper and it will turn blue

Question 37

what is the chemical test for the presence of water?

Answer 37

use anhydrous copper sulfate it will change from white to blue