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COLOURS Flashcards

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1
Q

Iron(II) metal ion

A

Green, turns orange/brown when left exposed due to oxidation

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2
Q

Iron (III) metal ion

A

Orange brown

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3
Q

Copper (II) metal ion

A

Blue

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4
Q

Compound to add when don’t know if the substance is iron (II) or iron(III) nitrate?

A

NaOH

If green, will be iron (II) if orange brown, will be iron(III)

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5
Q

zinc (II) when added NaOH

A

White ppt

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6
Q

zinc (II) when added NaOH in excess

A

Ppt redissolves

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7
Q

Calcium (II) when added NaOH

A

White ppt

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8
Q

Calcium (II) when added NaOH in excess

A

No change

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9
Q

Al (III) when added NaOH

A

White ppt

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10
Q

Al (III) when added NaOH in excess

A

White ppt redissolves

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11
Q

zinc (II) when added dilute ammonia

A

White

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12
Q

Calcium (II) when added dilute ammonia

A

None formed

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13
Q

Al (III) when added dilute ammonia

A

White

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14
Q

Zn (II) when added dilute ammonia in excess

A

Redissolves

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15
Q

Calcium (II) when added dilute ammonia in excess

A

No ppt

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16
Q

Al (III) when added dilute ammonia in excess

A

No change

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17
Q

Lithium flame test

A

Red

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18
Q

Sodium flame test

A

Yellow orange

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19
Q

Potassium flame test

A

Lilac

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20
Q

Calcium flame test

A

Brick red

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21
Q

Barium flame test

A

Apple green

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22
Q

strontium flame test

A

Crimson

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23
Q

Copper flame test

A

Green-turquoise

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24
Q

Magnesium flame test

A

No colour

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25
Q

Beryllium flame test

A

no colour

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26
Q

NH3 gas test

A

Red litmus paper turns blue

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27
Q

Ca(OH)2 ppt colour

A

White ppt

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28
Q

Ba(OH)2 ppt colour

A

Colourless

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29
Q

NO2 fumes colour

A

Brown fumes

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30
Q

Limewater when CO2 present

A

Cloudy

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31
Q

Fluorine gas colour

A

Pale yellow gas

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32
Q

Chlorine gas colour

A

Pale green gas

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33
Q

Bromine liquid colour

A

Dark red liquid

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34
Q

Iodine solid colour

A

Black, but readily sublimes to form purple vapour.

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35
Q

Chlorine in water

A

Almost colourless, faintly green

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36
Q

Bromine in water

A

Yellow orange

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37
Q

Iodine in water

A

Brown

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38
Q

Chlorine in hexane

A

Almost colourless

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39
Q

Bromine in hexane

A

Orange red

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40
Q

Iodine in hexane

A

Pink/violet

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41
Q

Hydrogen halides dissolve in water to produce acids, what colour does the blue litmus turn?

A

red

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42
Q

Fluoride ion ppt colour

A

None

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43
Q

Chloride ion ppt

A

White

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44
Q

Bromide ion colour

A

Cream

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45
Q

Iodide ion colour

A

Yellow

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46
Q

AgCl with ammonia

A

Dissolved colourless solution.

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47
Q

AgBr and ammonia colour

A

ppt Unchanged

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48
Q

AgBr in conc ammonia

A

Gives colourless solution

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49
Q

AgI and ammonia

A

Doesn’t dissolve

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50
Q

AgI with conc ammonia

A

doesnt dissolve

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51
Q

Test for alkene

A

Br water decolourised from brown to colourless.

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52
Q

Ignition of alkene

A

Very sooty. Orange flame

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53
Q

Ignition of alkanes

A

No soot visible. Yellow

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54
Q

bromide with alkane

A

Yellow. Br colour still there

Darker yellow when in the dark

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55
Q

bromine with alkene

A

colourless

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56
Q

Potassium manganate and sulfuric acid with alkane

A

Purple

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57
Q

Potassium manganate and sulfuric cid with alkene

A

Purple-orange-colourless

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58
Q

Potassium dichromate solution with solution hat oxidised

A

Orange to green

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59
Q

Colour high is given when fehlings solution tests for an aldehyde

A

Blue to red

60
Q

VO2+ +5 colour

A

Yellow

61
Q

VO^2+

+4

A

Blue

62
Q

V3+

+3

A

Green

63
Q

V2+

+2

A

Violet

64
Q

Acronym for vanadium colours

A

+5, +4, +3, +2
Y, B, G, V
You better get vrooming

65
Q

(Fe(H2O)6)^2+ colour

A

Pale green

66
Q

(Fe(H2O)6)^3+ colour

A

Yellow brown

67
Q

(Cu(H2O)6)^2+ colour

A

Blue solution.

68
Q

(Cu(H2O)5OH)^+ colour

A

Blue solution.

69
Q

(Cu(H2O)4(OH)2)

A

Blue ppt

70
Q

(Cu(NH3)4(H2O)2)^2+

A

Deep blue ppt

71
Q

(Cu(H2O)4(OH)2)

A

Blue ppt

72
Q

(CuCl)^-2

A

Yellow

73
Q

Cobalt colour 2+

A

Pink

74
Q

Fe 2+ colour

A

Green

75
Q

Fe 3+ colour

A

Yellow

76
Q

C 2+ colour

A

Blue

77
Q

Cr 3+ colour

A

Green

78
Q

Cr 6+ colour

A

Yellow and orange

79
Q

V 2+colour

A

Violet

80
Q

V 3+ colour

A

Green

81
Q

V 4+ colour

A

Blue

82
Q

V 5+ colour

A

Yellow

83
Q

(Co(H2O)6)^2+ colour

A

Pink

84
Q

(Co(H2O)4(OH)2)

A

Blue ppt, pink ppt

85
Q

Cr 3+ in NaOH

A

Green thick

86
Q

Mn 2+ in NaOH

A

Buff very runny

87
Q

Fe 2+ in NaOH

A

Dark green very thick

88
Q

Fe 3+ in NaOH

A

Red

89
Q

Ni 2+ in NaOH

A

Pale green

90
Q

Cu 2+ in NaOH

A

Dark blue

91
Q

Co 2+ in NaOH

A

Buff

92
Q

Zn 2+ in NaOH

A

Cream.

93
Q

Cr 3+ in NH3

A

Green

94
Q

Mn 2+ in NH3

A

Buff

95
Q

Fe 2+ in NH3

A

Dark green

96
Q

Fe 3+ in NH3

A

Orange

97
Q

Ni 2+ in NH3

A

Pale green

98
Q

Cu 2+ in NH3

A

Light blue

99
Q

Co 2+ in NH3

A

Blue

100
Q

Zn 2+ in NH3

A

White

101
Q

Which transition ions dissolve in excess NaOH?

A

Cr 3+ and Zn 2+

102
Q

Which transition metals change in excess NH3?

A

Ni 2+, Cu 2+, Co 2+, Zn 2+.

103
Q

Ni 2+ colour change with excess NH3

A

Green to Lavender blue solution

104
Q

Cu 2+ change in excess NH3

A

Light blue ppt dissolves to form royal blue solution

105
Q

Co 2+ change with excess NH3

A

Blue ppt dissolves and gets brown oxidise solution

106
Q

Zn2+change with excess NH3

A

White to colourless

107
Q

Phenolphthalein colour when alkali

A

Pink

108
Q

Phenolphthalein colour when acidic

A

Colourless

109
Q

Methyl orange colour when acidic

A

Red

110
Q

Methyl orange when alkali

A

Yellow

111
Q

Potassium manganate colour

A

Purple

112
Q

Potassium manganate in acidic

A

Nearly colourless

113
Q

Starch colour when there’s a little bit if iodine

A

Blue black solution

114
Q

Iodine in solution potassium iodine

A

Dark brown

115
Q

Iodine reacted with sodium thiosulfate

A

Nearly colourless

116
Q

(Cu(EN)2)^2+

A

Purple/violet

117
Q

(Cu(edta)^-2

A

Blue

118
Q

Colour changes of Cr when potassium dichromate and sodium hydroxide is added

A

Orange to yellow

119
Q

Cr colour change when sulfuric acid added to the solution ade from Cr and potassium dichromate and NaOH

A

Orange

120
Q

Potassium dichromate and sulfuric acid and zinc powder, what colours will appear?

A

Orange to grey, to blue to grey

121
Q

Potassium dichromate and sulfuric acid with hydrogen peroxide

A

Yellow, to green/brown to green.

122
Q

Test for alkenes, adding potassium manganate

A

Purple to colourless

123
Q

Test for alcohols, adding PCl5

A

Steamy fumes, HCL gas. Blue litmus turns red..

124
Q

Test for alcohol, adding H2SO4 and potassium dichromate

A

Orange to dark green.

If tertiary, no reaction

125
Q

Test for aldehydes, fehings

A

Goes brick red ppt.

126
Q

Test for aldehyde Tollens

A

Silver mirror ppt

127
Q

Test or carboxylate acids, pH paper

A

Orange to dark green if weak acid present

128
Q

Test for c acids if add sodium carbonate powder

A

Effervescence. Bubbles, limewater turns milky due to CO2 given off.

129
Q

Cyclohexene when it reacts with bromine in the dark

A

HBr decolorises.

130
Q

Benzene with bromine in the dark

A

No reaction with br alone. If add iron filings as catalyst, will decolourise bromine and HBr fumes evolve.

131
Q

Benzene with potassium manganate

A

No reaction

Ring is too stable

132
Q

Benzene with hydrogen over nickel catalyst

A

One mole absorbs3 moles of H at 150 degree. Shows its got 3 double rings?

133
Q

Benzene with conc HNO3 and H2SO4

A

Substitution reaction, yellow oil formed.

Nitrobenzene formed

134
Q

Phenol with pH

A

Orange to red

135
Q

Phenol with sodium hydrogencarbonate

A

White ppt. Slight reaction

136
Q

Phenol with NaOH

A

Dissolves easily

137
Q

Phenol with HCL

A

Steamy fumes and oily layer

138
Q

Phenol reaction with Na

A

Effervescence H2 Gas

139
Q

Phenol with Br

A

Colour decolourises

White ppt

140
Q

Phenol with iron III chloride

A

Purple solution. Ethanol, no change

Can be used to test between phenol and ethanol

141
Q

Ammonia with pH

A

Very deep blue

142
Q

Ammonia with evaporation of water

A

Crystals also eventually.

143
Q

Ammonia with copper sulphate solution

A

Deep blue when added.

144
Q

Amines with copper sulphate

A

Deep blue gelatinous

145
Q

Phenylamine with copper II sulphate

A

Green solid

Chemistry (10 decks)

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