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old GCSE Chemistry > Chemical testing > Flashcards

Chemical testing Flashcards

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1
Q

Method for testing cations

A
  1. Clean the wire (dip the end of the wire into the acid and then burn in a flame, repeat this three times)
  2. Dip the wire into the acid and then the solid sample
  3. Burn the sample in the flame
  4. Note the colour observed and compare to known colours
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2
Q

Lithium flame test

A

Red flame

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3
Q

Sodium flame test

A

Yellow flame

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4
Q

Potassium flame test

A

Lilac flame

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5
Q

Calcium flame test

A

Orange/red flame

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6
Q

Copper flame test

A

Blue/green flame

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7
Q

Method for testing for cations (Copper, Iron)

A

Add sodium hydroxide in excess

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8
Q

Copper II results (test for cations)

A

Blue precipitate forms of Cu(OH)2

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9
Q

Iron (II) results (test for cations)

A

Green precipitate forms of Fe(OH)2

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10
Q

Iron (III) results (testing for cations)

A

Rust coloured precipitate forms of Fe(OH)3

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11
Q

Describe test for ammonium ions

A

Add sodium hydroxide, Heat the reacting mixture, test the gas produced using damp red litmus paper

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12
Q

Results of testing for ammonium ions

A
  • No precipitate formed

- Gas turns damp red litmus blue

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13
Q

Testing for halides method

A

Add dilute nitric acid then Add a small amount of silver nitrate solution

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14
Q

chloride test results (testing for anions)

A

Turns to a white precipitate

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15
Q

bromide test results

A

Cream precipitate formed

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16
Q

iodide test results (testing for anions)

A

Yellow precipitate formed

17
Q

Describe test for sulphates

A

Dissolve in water, add barium chloride

18
Q

Sulphates test results

A

White precipitate formed (of barium sulphate)

19
Q

Describe test for carbonates

A

Add hydrochloric acid, bubble gas through limewater

20
Q

Carbonate test results

A

Calcium carbonate effervesces

Limewater turns cloudy white

21
Q

Test for chlorine

A

Add damp blue litmus paper

22
Q

Result for test for chlorine

A

Turns from blue to pink then it is bleached

23
Q

Test for oxygen

A

Add a glowing splint

24
Q

Results for test for oxygen

A

The splint relights

25
Q

Test for hydrogen

A

Add a lit splint

26
Q

Results for test for hydrogen

A

The splint burns with a squeaky pop

27
Q

Test for CO2

A

Bubble it through limewater

28
Q

Results for test for CO2

A

Limewater turns cloudy white

29
Q

Test for ammonia

A

Use damp red litmus paper

30
Q

Results for test for ammonia

A

Red litmus turns from red to blue

31
Q

Test for water

A

Anhydrous copper sulphate

32
Q

Result for test for water

A

Copper sulphate turns from white to blue

old GCSE Chemistry (34 decks)

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