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chemistry > QA memorise > Flashcards

QA memorise Flashcards

1
Q

test for ammonia

A

turns damp red litmus paper blue.
gas evolved is colourless and pungent.

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2
Q

test for co2

A

bubble gas in limewater, co2 will form white ppt.

(dissolves in excess limewater to form colourless solution)

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3
Q

test for hydrogen

A

extinguishes a lighted split with ‘pop’ spund

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4
Q

test for oxygen

A

relights a glowing splint.

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5
Q

test for chlorine

A

turns damp blue litmus paper red, then bleaches it.
gas evolved is yellowish-green and pungent.

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6
Q

test for sulfur dioxide

A

turns acidified potassium manganate (VII) from purple to colourless.
gas evolved is colourless and pungent.

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7
Q

test for water vapour

A

turns dry cobalt (II) chloride paper from blue to pink.
gas evolved is colourless and odourless.

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8
Q

use what to test for cations?

A

aqueous sodium hydroxide and aqueous ammonia

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9
Q

observations when ammonium is tested for cations?

A

ammonia is produced on warming (naoh)

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10
Q

observations when calcium is tested for cations?

A

white ppt (naoh, insoluble in excess)
no ppt (nh3)

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11
Q

observations when copper (II) is tested for cations? *

A

light blue ppt, insoluble in excess (naoh)
light blue ppt, soluble in excess and turns into a dark blue solution
(nh3)

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12
Q

observations when iron (II) is tested for cations? *

A

green ppt, insoluble in excess
(naoh & nh3)

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13
Q

observations when iron (III) is tested for cations?

A

reddish-brown ppt, insoluble in excess
(naoh & nh3)

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14
Q

observations when lead (II) is tested for cations?

A

white ppt, soluble in excess turning into a colourless solution
(naoh)
white ppt, insoluble in excess
(nh3)

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15
Q

observations when zinc is tested for cations?

A

white ppt, soluble in excess turning into a colourless solution
(naoh & nh3)

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16
Q

describe test for chloride ions

A

add dilute nitric acid, then silver nitrate (AgNO3).
white ppt of silver chloride is formed.

17
Q

describe test for iodide ions

A

add dilute nitric acid, then silver nitrate (AgNO3).
yellow ppt of silver iodide is formed.

18
Q

describe test for sulfate ions

A

add dilute nitric acid, then barium chloride/nitrate.
white ppt of barium sulfate is formed.

19
Q

describe test for carbonate ions

A

add dilute hydrochloric acid and effervescence is produced.
carbonate reacts with acid to produce salt, h2o, co2.
test for co2: limewater

20
Q

describe test for nitrate ions

A

add dilute sodium hydroxide, then a piece of aluminium foil. warm mixture and test for gas evolved.
test for ammonia: litmus paper red > blue

21
Q

how to differentiate between lead (II) and aluminium?

A

add aqueous potassium iodide.
yellow ppt > lead (II) iodide

chemistry (1 decks)

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