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Chemistary > Flame tests > Flashcards

Flame tests Flashcards

1
Q

Describe the flame test

A
  1. Clean nichrome wire with concentrated HCl
  2. Place over blue flame to dry until no colour is present
  3. dip into HCL again
  4. scoop some of the soild(powder needed)
  5. place at the edge of the flame and observe colour change
  6. repeat with different solids
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2
Q

What is the result for copper in the flame test

A

Blue

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3
Q

What is the result for Lithium in the flame test

A

Crimson

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4
Q

What is the result for Calcium in the flame test

A

Brick red/ Orange

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5
Q

What is the result for Potassium in the flame test

A

Lilac

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6
Q

What is the result for Sodium in the flame test

A

Yellow/Orange

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7
Q

What is a percipitate

A

It is a solid formed in a reaction (Insoluble)

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8
Q

what does copper (cu3+ ) form in precipitation with sodium hydroxide

A

Blue precipitate

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9
Q

what does Aluminium(Al3+) form in precipitation with sodium hydroxide

A

White precipitate

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10
Q

what does Calcium(ca2+ ) form in precipitation with sodium hydroxide

A

White precipitate

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11
Q

what does Iron 2 (Fe2+ ) form in precipitation with sodium hydroxide

A

Green precipitate

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12
Q

what does Iron3 (Fe3+ ) form in precipitation with sodium hydroxide

A

Brown precpitate

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13
Q

What happens it Aluminium ions in excess Sodium Hydroxide

A

Dissolves in excess

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14
Q

What is the test for Carbonates

A

Dilute acid and limewater

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15
Q

What is the result it carbonates are present and why?

A

Colourless to cloudy ( Carbon dioxide reacts with limewater for observation)

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16
Q

What is the test for halides

A

Adding nitric acid and silver nitrate

17
Q

Why is nitric acid added for the test if halides

A

To remove any impurities (e.g, OH-)

18
Q

What is precipitate of Chlorine

A

White precipitate

19
Q

What is the precipitate for Bromine

A

Cream precipitate

20
Q

What is the precipitate of Iodine

A

Yellow precipitate

21
Q

What is the precipitate of Flourine
and what mistake can be done with fluorine

A

Colourless solution ( If impurities aren’t removed it will form a white precipitate and could be mistaken for chlorine)

22
Q

What is the test for sulphates

A

Adding Hydrochloric acid and Barium chloride

23
Q

What is precipitate if sulphates are present

A

White precipitate

24
Q

How do you test for Carbon dioxide

A

Bubble co2 gas in limewater

25
Q

What is the test for chlorine

A

Place a damp blue litmus paper into a test tube with chlorine gas

26
Q

What is the test for Hydrogen

A

Place a lit splint into a test tube with hydrogen gas

27
Q

What is the test for oxygen

A

Place a glowing splint into a test tube containing oxygen gas

28
Q

What is the result for hydrogen test

A

Squeaky pop sound

29
Q

What is the result for a chlorine test

A

Bleaches damp blue litmus paper

30
Q

What is the result for carbon dioxide test

A

Turns limewater cloudy

31
Q

What is the result for the oxygen gas test

A

Relights glowing splint

Chemistary (2 decks)

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