Chemical tests Flashcards

1
Q

Ammonia test + result

A

Damp red litmus paper
- Turns blue

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2
Q

ammonia appereance of test

A

colorless, pungent smell

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3
Q

carbon dioxide test and results

A

bubble though lime water
- lime water turns milky/ cloudy

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4
Q

C02 appereance test

A

colorless and odorless

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5
Q

chlorine test and result

A

damp blue litmus paper
- paper is bleached

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6
Q

chlorine apperence in test

A

pale green, choking smell

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7
Q

hydrogen test and result

A

hold a lighted splint in mouth of test tube
- burns with a squeaky pop sound

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8
Q

hydrogen appearance test

A

colourless and odourless

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9
Q

oxygen test and result

A

hold a glowing splint
-splint relights

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9
Q

oxygen appearance test

A

colourless and odourless

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10
Q

why is flame test neccasary

A

identify metal ions by the color of flame they produce

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11
Q

how to carry out a flame test

A
  • dip loop of an unreactive wire (eg. nichrome) in conc. acid
  • hold it in blue flame of bunsen burner until no color change
  • dip loop into solid sample and place it on the edge of the blue bunsen flame
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12
Q

Li+

A

red

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13
Q

Na+

A

yellow

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14
Q

K+

A

lilac

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15
Q

Ca2+

A

orange-red

16
Q

Cu2+

A

blue- green

17
Q

what is the test for cations

A

place metal cations in aq solution to identify what color precipitate they form

18
Q

Copper (II)

A

light blue ppt formed

19
Q

Iron (II)

A

green ppt formed

20
Q

Iron (III)

A

red-brown ppt formed

21
Q

Carbonate test

A

add dilute HCL and test the gas released

22
Q

Carbonate result

A

effervescence
- gas produced CO2
- co2 test

23
Q

Chloride test

A

acidify with nitric acid and add aq silver nitrate

24
chloride result
white ppt formed
25
bromide test
acidify with nitric acid and add aq silver nitrate
26
Bromide result
cream ppt formed
27
iodide test
acidify with nitric acid and add aq silver nitrate
28
iodide result
yellow ppt formed
29
sulfate test
acidify with nitric acid and add aq barium nitrate
30
sulfate result
white ppt formed
31
chemical test for water
anhydrous copper (II) sulfate turns from WHITE to BLUE