Chemistry Tests

Question 1

adding sodium hydroxide and aqueous ammonium solution to ammonium

Answer 1

ammonia gas produced on warming

Question 2

adding sodium hydroxide and aqueous ammonium solution to copper (II)

Answer 2

light blue ppt insoluble in excess

light blue ppt dissolves in excess ammonia, giving deep blue solution

Question 3

adding sodium hydroxide and aqueous ammonium solution to iron (II)

Answer 3

green ppt insoluble in excess

Question 4

adding sodium hydroxide and aqueous ammonium solution to iron (III)

Answer 4

rust brown ppt insoluble in excess

Question 5

adding sodium hydroxide and aqueous ammonium solution to chromium (III)

Answer 5

grey green ppt, soluble in excess giving a green solution

grey green ppt insoluble in excess

Question 5

adding sodium hydroxide and aqueous ammonium solution to calcium

Answer 5

white ppt insoluble in excess

no ppt/very slight white

Question 6

adding sodium hydroxide and aqueous ammonium solution to magnesium

Answer 6

white ppt insoluble in excess

Question 7

adding sodium hydroxide and aqueous ammonium solution to zinc

Answer 7

white ppt soluble in excess giving a colourless solution

white ppt insoluble in excess

Question 8

adding sodium hydroxide and aqueous ammonium solution to aluminium

Answer 8

white ppt soluble in excess giving a colourless solution

white ppt insoluble in excess

Question 9

NA+ (cations)

Answer 9

colourless in solution

golden yellow in flame

Question 10

K+ (cations)

Answer 10

Colourless in solution

Lilac in flame

Question 11

CA 2+ (cations)

Answer 11

colourless in solution

orange-red in flame

Question 12

sr 2+ (cations)

Answer 12

colourless in solution

crimson-red in flame

Question 13

ba 2+ (cations)

Answer 13

colourless in solution

apple-green in flame

Question 14

mg 2+ (cations)

Answer 14

colourless in solution

bright-white in flame

Question 14

cu 2+ (cations)

Answer 14

blue in solution

green in flame

Question 15

carbonate (anion test)

Answer 15

add dilute HCL

fizzing, co2 produced

Question 16

chloride, bromide, and iodide (anion test)

Answer 16

acidify with dilute HNO3 then add aq AGNO3

chloride: white ppt soluble in ammonia

bromide: off white ppy, slightly soluble in ammonia

iodide: yellowish-white ppt insoluble in ammonia

Question 17

sulfate (anion test)

Answer 17

acidify with dilute HCL/HNO then add aq BaCL2/ Ba(OH)3

white ppt of barium sulfate

Question 18

nitrate (anion test)

Answer 18

mix sodium alkaline with NAOH then add Al foil and warm slightly

red litmus turns blue

Question 19

ammonia (gas test)

Answer 19

colourless, pungent smell

hold damp red litmus in the gas

indicator paper turns blue

Question 20

chlorine (gas test)

Answer 20

pale green choking smell

hold damp litmus paper in gas

paper is bleached to white

Question 20

carbon dioxide (gas test)

Answer 20

colourless and odourless

pass gas through limewater

limewater turns milky due to presence of CACO3

Question 21

sulfur dioxide (gas test)

Answer 21

colourless acidic/pungent smell

add to solution of filter paper soaked in potassium manganate (VII)

potassium manganate changes from purple to colourless

Question 22

hydrogen (gas test)

Answer 22

colourless and odourless hold a lighted splint in the gas pop sound is heard

Question 23

oxygen (gas test)

Answer 23

hold a "glowing" wooden splint in the gas "glowing" splint relights

Question 24

sulfite (gas test)

Answer 24

add drops of acidified potassium permanganate turns from purple to colourless

Question 24

nitrates (solubility)

Answer 24

soluble with all cations

Question 24

sodium potassium ammonium (solubility)

Answer 24

soluble with all cations

Question 25

chloride, bromide and iodide (solubility)

Answer 25

soluble with all cations except silver, lead and mercury

Question 26

hydroxide (solubility)

Answer 26

soluble with na+, k+, NH4+, Ca2+, Ba2+, Sr2+, Mg2+ (partially) insoluble with all other cations

Question 27

sulfides (s2-) (solubility)

Answer 27

soluble with na+, k+, NH4+, ca2+, Ba2+, Sr2+, Mg2+ insoluble with all other cations

Question 28

carbonates (solubility)

Answer 28

soluble with na+, k+ and NH4+ insoluble with all other catins

Question 29

phosphates (solubility)

Answer 29

soluble with na+, k+ and NH4+ insoluble with all other cations

Question 29

sulfates (solubility)

Answer 29

soluble with all cations except ag+, ca2+, Ba2+, Sr2+, hg+, Hg2+ and Pb2+