Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IP Secondary 3 Chemistry > Chapter 2 - Qualitative Analysis > Flashcards

Chapter 2 - Qualitative Analysis Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

Test for gases

A
  1. Observe the colour of the gas
  2. Conduct a litmus test (both blue and red)
    3a. Perform an acidified potassium permanganate(VII) test
    3b. Perform a splint test
  3. Perform a limewater test
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Hydrogen, H2

A

Colourless, odourless.
Light splint is extinguished with a ‘pop’ sound.
(No change observed for litmus test.)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Oxygen, O2

A

Colourless, odourless.
Glowing splint is rekindled/relit.
(No change observed for litmus test.)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Carbon dioxide, CO2

A 
Colourless, odourless. 
White ppt (calcium carbonate) is produced when gas is bubbled into limewater (calcium hydroxide).
Moist blue litmus turns red.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Chlorine, Cl

A

Greenish-yellow, pungent.

Moist blue litmus turns red, and is then bleached white.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Sulfur dioxide, SO2

A

Colourless, pungent.
Acidified potassium manganate(VII), KMnO4, turns from purple to colourless (decolourised).
Moist blue litmus turns red.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Ammonia, NH3

A

Colourless, pungent.
White fumes of NH4Cl are observed when a glass rod dipped in concentrated hydrochloric acid is brought near the gas.
Moist red litmus turns blue.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Water vapour, H2O

A 
Colourless, odourless.
Anhydrous cobalt(II) chloride, CoCl2, paper turns from blue to pink.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Hydrogen chloride, HCl

A

Colourless, pungent.
White fumes of NH4Cl are observed when a glass rod dipped in aqueous ammonia is brought near the gas.
Moist blue litmus turns red.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Test for water

A

Add a few drops of the sample to anhydrous copper(II) sulfate. Anhydrous CuSO4 changes from white to blue.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Zn2+ in sodium hydroxide

A

White precipitate soluble in excess sodium hydroxide to give colourless solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Zn2+ in aqueous ammonia

A

White precipitate soluble in excess aqueous ammonia to give colourless solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Al3+ in sodium hydroxide

A

White precipitate soluble in excess sodium hydroxide to give colourless solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Al3+ in aqueous ammonia

A

White precipitate insoluble in excess aqueous ammonia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Pb2+ in sodium hydroxide

A

White precipitate soluble in excess sodium hydroxide to give colourless solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Pb2+ in aqueous ammonia

A

White precipitate insoluble in excess aqueous ammonia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Ca2+ in sodium hydroxide

A

White precipitate insoluble in excess sodium hydroxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Ca2+ in aqueous ammonia

A

No precipitate (in aqueous ammonia)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Cu2+ in sodium hydroxide

A

Blue precipitate insoluble in excess sodium hydroxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Cu2+ in aqueous ammonia

A

Blue precipitate soluble in excess aqueous ammonia to give dark blue solution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Fe2+ in sodium hydroxide

A

Green precipitate insoluble in excess sodium hydroxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Fe2+ in aqueous ammonia

A

Green precipitate insoluble in excess aqueous ammonia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Fe3+ in sodium hydroxide

A

Reddish-brown precipitate insoluble in excess sodium hydroxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Fe3+ in aqueous ammonia

A

Reddish-brown precipitate insoluble in excess aqueous ammonia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

NH4+ in sodium hydroxide

A

No precipitate observed (in sodium hydroxide)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

NH4+ in aqueous ammonia

A

A colourless, pungent gas evolved, which turns moist red litmus blue. Gas is ammonia.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

How to differentiate white ppt of Pb2+ and Al3+?

A

Add potassium iodide (KI):

  • no precipitate → Al3+
  • yellow precipitate (PbI2) → Pb2+
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Na+ flame test

A

Dark yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Ba2+ flame test

A

Pale green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Ca2+ flame test

A

Red

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

K+ flame test

A

Lilac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Pb2+ flame test

A

Greyish white

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Cu2+ flame test

A

Bluish green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

How to produce hydrogen gas?

A

Acid with reactive metal reaction

34
Q

How to produce oxygen gas?

A

Heating of nitrates

Decomposition of hydrogen peroxide

35
Q

How to produce sulfur dioxide gas?

A

Reacting dilute acids with sulfite

Heating of sulfates

36
Q

How to produce chlorine gas?

A

Hydrochloric acid with oxidising agents

37
Q

How to produce ammonia gas?

A

Heating ammonium salts with bases

38
Q

How to produce carbon dioxide gas?

A

Heating of carbonates

Reaction of dilute acids with carbonates / hydrogencarbonates

39
Q

Effect of heat on carbonate (solid)

A

Generally decompose on strong heating to produce carbon dioxide gas

40
Q

Effect of heat on Group 1 nitrate (solid)

A

Decompose on strong heating to produce oxygen gas and the Group 1 metal nitrite

41
Q

Effect of heat on other nitrates (solid)

A

Decompose on strong heating to produce oxygen gas and nitrogen dioxide gas
(nitrogen dioxide is orange/brown in colour)

42
Q

Effect on heat on ammonium salt (solid)

A

Sublime on heating. White solid will be observed on the cooler regions of the test tube.

44
Q

Effect of heat on hydrated salt (solid)

A

Produces steam on strong heating. Steam will condense on the cooler regions of the test tube.

45
Q

NH4+ in aqueous solution

A

Colourless solution

46
Q

Na+ in aqueous solution

A

Colourless solution

47
Q

K+ in aqueous solution

A

Colourless solution

48
Q

Ca2+ in aqueous solution

A

Colourless solution

49
Q

Pb2+ in aqueous solution

A

Colourless solution

50
Q

Al3+ in aqueous solution

A

Colourless solution

51
Q

Cu2+ in aqueous solution

A

Blue solution

52
Q

Fe2+ in aqueous solution

A

Pale green solution

53
Q

Fe3+ in aqueous solution

A

Yellow solution

54
Q

MnO4- in aqueous solution

A

Purple solution

55
Q

Mn2+ in aqueous solution

A

Pale pink/colourless solution

56
Q

H2O2 in aqueous solution

A

Colourless solution

57
Q

Cr2O72- (dichromate) in aqueous solution

A

Orange solution

58
Q

Cr3+ in aqueous solution

A

Green solution

59
Q

AgCl in aqueous solution

A

White precipitate

60
Q

PbCl2 in aqueous solution

A

White precipitate

61
Q

AgI in aqueous solution

A

Yellow precipitate

62
Q

PbI2 in aqueous solution

A

Yellow precipitate

63
Q

CaSO4 in aqueous solution

A

White precipitate

64
Q

BaSO4 in aqueous solution

A

White precipitate

65
Q

PbSO4 in aqueous solution

A

White precipitate

66
Q

CaCO3 in aqueous solution

A

White precipitate

67
Q

CuCO3 in aqueous solution

A

Green solid (due to the malachite mineral)

68
Q

Cu(OH)2 in aqueous solution

A

Blue precipitate

69
Q

Fe(OH)2 in aqueous solution

A

Dirty-green precipitate

70
Q

Fe(OH)3 in aqueous solution

A

Reddish-brown precipitate

71
Q

CaO(s) appearance

A

White solid

72
Q

PbO(s) appearance

A

Yellow solid

73
Q

CuO(s) appearance

A

Black solid

74
Q

MnO2(s) appearance

A

Black solid

75
Q

ZnO(s) appearance

A 
White solid (when cooled)
Yellow solid (when heated)
76
Q

NO2(g) appearance

A

Reddish-brown gas

77
Q

Br2(g) appearance

A

Reddish-brown gas

78
Q

Cl2(g) appearance

A

Greenish-yellow / Yellowish-green gas

79
Q

I2(g) appearance

A

Violet gas

80
Q

I2(s) appearance

A

Black solid

81
Q

I2 in aqueous solution

A

Brown solution

82
Q

Cu(s) appearance

A

Pink (fresh)

Reddish-brown (exposed to air)

83
Q

All metals except Cu(s) appearance

A

Silver (fresh)

Grey (exposed to air)

84
Q

Fe(s), Ni(s) appearance

A

Grey

IP Secondary 3 Chemistry (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions