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Chemistry S3 > QA > Flashcards

QA Flashcards

1
Q

Test for gases (3 steps)

A
  1. Colour, odour
  2. Litmus test
  3. Confirmatory test
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2
Q

Test for H2

A
  1. Colourless, odourless
  2. No effect on moist litmus paper
  3. Place a lighted splint at the mouth of the test tube, lighted splint extinguishes with a ‘pop’ sound if Hydrogen is present
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3
Q

Test for O2

A
  1. Colourless, odourless
  2. No effect on moist litmus paper
  3. Place a glowing splint at the mouth of the test tube, glowing splint rekindles if Oxygen is present
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4
Q

Test for CO2

A
  1. Colourless, odourless
  2. Turns moist blue litmus paper red
  3. Bubble the gas through a test tube containing limewater. If a white ppt forms, gas present is CO2
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5
Q

Test for NH3

A
  1. Colourless, pungent smelling
  2. Turns moist red litmus paper blue
  3. Nil
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6
Q

Test for SO2

A
  1. Colourless, choking smell
  2. Turns moist blue litmus paper red
  3. Filter paper soaked in KMnO4 changes from purple to colourless
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7
Q

Test for Cl2

A
  1. Greenish-yellow, irritating smell
  2. Turns moist blue litmus paper red, then bleaches
  3. Nil
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8
Q

Test for H20

A
  1. Colourless, odourless
  2. No effect on moist litmus paper
  3. Anhydrous cobalt (II) chloride from blue to pink
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9
Q

Why must litmus paper be moist before testing

A

To allow for the dissociation of ions

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10
Q

Test for carbonate ions

A

Add dilute HCl, effervescence is observed (CO2)

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11
Q

Test for nitrate ions

A

Add aqueous NaOH, then warm gently with a piece of aluminium foil. Effervescence is observed (NH3)

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12
Q

Test for sulfate ions

A

Add dilute HNO3, then aqueous BaNO3. White ppt of BaSO4 forms

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13
Q

Test for chloride ions

A

Add dilute HNO3, then aqueous AgNO3. White ppt of AgCl forms

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14
Q

Test for iodide ions

A

Add dilute HNO3, then aqueous AgNO3. Yellow ppt of AgI forms

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15
Q

Test for cations: Al3+

A

White ppt in NaOH, soluble in excess to form colourless solution

White ppt in NH4OH, white ppt insoluble in excess

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16
Q

Test for cations: Pb2+

A

White ppt in NaOH, soluble in excess to form colourless solution

White ppt in NH4OH, white ppt insoluble in excess

17
Q

Test for cations: Zn2+

A

White ppt in NaOH, soluble in excess to form colourless solution

White ppt in NH4OH, soluble in excess to form colourless solution

18
Q

Test for cations: Cu2+

A

Light blue ppt in NaOH, blue ppt insoluble in excess

Light blue ppt in NH4OH, soluble in excess to form deep-blue solution

19
Q

Test for cations: Fe2+

A

Green ppt in NaOH, green ppt insoluble in excess

Green ppt in NH4OH, green ppt insoluble in excess

20
Q

Test for cations: Fe3+

A

Reddish-brown ppt in NaOH, reddish-brown ppt insoluble in excess

Reddish-brown ppt in NH4OH, reddish-brown ppt insoluble in excess

21
Q

Test for cations: Ca2+

A

White ppt in NaOH, white ppt insoluble in excess

No visible change

22
Q

Test for cations: NH4+

A

Ammonia produced on warming

No visible change

23
Q

Test for cations: NH4+

A

Ammonia produced on warming

No visible change

24
Q

Thermal decomposition: carbonate

A

CaCO3 -> CaO + CO2

25
Q

Thermal decomposition: hydroxides

A

Ca(OH)2 -> CaO + H2O

Chemistry S3 (4 decks)

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