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IGCSE Chemistry > tests > Flashcards

tests Flashcards

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1
Q

test for carbon dioxide

A

turns limewater milky

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2
Q

test for oxygen

A

relights glowing splint

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3
Q

test for hydrogen

A

pops a lighted splint

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4
Q

test for ammonia

A

turns dap red litmus paper blue

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5
Q

test for sulfur dioxide

A

turns acidified aqueous potassium magnate from purple to colourless

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6
Q

test for hydrochloric acid

A

turns blue litmus paper red

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7
Q

test for chlorine gas

A

damp blue litmus paper turns red then bleaches

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8
Q

NaOH or ammonia method for test for cations

A

Metal cations in aqueous solution can be identified by the colour of the precipitate they form on addition of sodium hydroxide and ammonia
If only a small amount of NaOH is used then normally the metal hydroxide precipitates
In excess NaOH some of the precipitates may dissolve
A few drops of NaOH is added at first and any colour changes or precipitates formed are noted
Then the NaOH is added in excess and the reaction is observed again
The steps are repeated for the test using ammonia solution

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9
Q

results for test for cations

A

see table https://docs.google.com/document/d/1FEuoHGrHnAgaCxSHhz8YD89lbgVijgTnlItPZ4HTruU/edit

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10
Q

Lithium cation flame test

A

red flame

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11
Q

Sodium cation flame test

A

yellow flame

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12
Q

potassium cation flame test

A

lilac flame

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13
Q

Calcium (2+) cation flame test

A

orange-red flame

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14
Q

Copper (2+) flame test

A

blue-green flame

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15
Q

test for carbonate anion

A
  • add dilute acid

- test the released gas

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16
Q

result for carbonate anion

A

effervescence, gas produced is CO2 which turns limewater milky

17
Q

test for chloride anion

A

acidify with dilute nitric acid and add aqueous silver nitrate

18
Q

result for chloride anion

A

white ppt

19
Q

test for bromide anion

A

acidify with dilute nitric acid and add aqueous silver nitrate

20
Q

result for bromide anion

A

cream ppt

21
Q

test for iodide anion

A

acidify with dilute nitric acid and add aqueous silver nitrate

22
Q

result for iodide anion

A

yellow ppt

23
Q

test for nitrate anion

A

add aqueous NaOH and aluminium foil, warm gently and test the gas released

24
Q

result for nitrate anion

A

gas given off is ammonia, has a pungent smell and turns moist red litmus paper blue

25
Q

test for sulfate anion

A

acidify with dilute nitric acid and add aqueous barium nitrate

26
Q

result for sulfate anion

A

white ppt

27
Q

test for sulfite anion

A

add dilute acid, warm gently and test the gas released

28
Q

result for sulfite anion

A

gas decolorizes purple acidified aqueous potassium manganate (VII) solution

IGCSE Chemistry (15 decks)

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