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Chemistry > Tests > Flashcards

Tests Flashcards

1
Q

Test for double bond

A

Few drops of bromine water ( redish brown colour )

If it has a double bond it goes colourless

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2
Q

Tollens test

Silver mirror

A

Solution of silver nitrate in aqueous ammonia
Silver mirror formed if its an aldehyde

[ Ag(NH3)2]+ + e- ➡️ Ag + 2NH3

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3
Q

Fehlings test

A

Blue copper (ll) ions to a red precipitate copper (i) ion

Oxides aldehydes

Cu 2+ + e- ➡️ Cu+

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4
Q

Halogenalkane

R-X

A

Add NaOH and warm
Acidify with HNO3
Add AgNO3

Precipitate of AgX

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5
Q

Alcohol

R-OH

A

Acidified K2Cr2O7

Orange to green colour

Primary alcohols
Secondary alcohols
Aldehydes

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6
Q

Carboxylic acid

A

Add NaHCO3

Carbon dioxide given off

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7
Q

Barium chloride and NaOH

A

Initial = colourless solution
NaOH = colourless solution
Excess NaOH = colourless solution

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8
Q

Calcium bromide and NaOH

A

Initial = colourless solution
NaOH = slight white ppt
Excess NaOH = slight white ppt

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9
Q

Magnesium chloride and NaOH

A

Initial = colourless solution
NaOH = slight white ppt
Excess NaOH = white ppt

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10
Q

Strontium chloride and NaOH

A

Initial = colourless solution
NaOH = slight white ppt
Excess NaOH = slight white ppt

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11
Q

Barium chloride and H2SO4

A

Initial = colourless solution
H2SO4 = white ppt
Excess H2SO4 = white ppt

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12
Q

Calcium bromide and H2SO4

A

Initial = colourless solution
H2SO4 = slight white ppt
Excess H2SO4= slight white ppt

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13
Q

Magnesium chloride and H2SO4

A

Initial = colourless solution
H2SO4 = slight white precipitate
Excess H2SO4 = colourless solution

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14
Q

Strontium chloride and H2SO4

A

Initial = colourless solution
H2SO4 = white ppt
Excess H2SO4 = white ppt

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15
Q

Ammonium chloride and sodium hydroxide

A

Damp red litmus paper = blue

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16
Q

Sodium hydroxide

A

Damp red litmus paper = blue

17
Q

Ammonia solution

A

Damp red litmus paper = blue

18
Q

Limewater

A

Colourless solution to cloudly

19
Q

Test of sulphate ions

A

White precipitate forms

20
Q

Potassium chloride and HNO3

A

White precipitate

21
Q

Potassium bromide and HNO3

22
Q

Potassium iodide and HNO3

A

Yellow precipitate

23
Q

Potassium chloride and NH3

A

Colourless solution

24
Q

Potassium bromide and NH3

A

Cream precipitate

25
Q

Potassium iodide and NH3

A

Yellow precipitate

26
Q

Potassium chorine and con NH3

A

Colourless solution

27
Q

Potassium bromide and con NH3

A

Colourless solution

28
Q

Potassium iodide and con NH3

A

Yellow preciptate

29
Q

Potassium chloride and concentrated sulphuric acid

And paper test

A

Effervescence

Red

30
Q

Potassium bromide and con sulphuric acid

A

Effervescence
Brown gas produced
Solution turns deep brown / red

31
Q

Potassium iodide and con sulphuric acid

And paper test

A

Solution goes red/brown
Immediately
Brown gas produced

Turns black/grey

Chemistry (20 decks)

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