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Chemistry Paper 2 > Flame Tests > Flashcards

Flame Tests Flashcards

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1
Q

Test for hydrogen

A

Test tube of hydrogen gas
Hold a lighted splint at the open end of the test tube
Lighted splint pops
Wear eye protection, hydrogen is flammable

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2
Q

How to get hydrogen to test

A

Zinc and dilute sulfuric acid

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3
Q

Test for oxygen

A

15cm3 of hydrogen peroxide solution in a small comical flask
Add manganese IV oxide from the end of the spatula
Insert a glowing splint (made by blowing out a lighted splint) in the mouth of the flask
Glowing splint will relight in oxygen
Safety wear eye protection

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4
Q

Test for carbon dioxide

A

Bubble carbon dioxide through limewater

Limewater turns cloudy

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5
Q

What is calcium hydroxide solution

A

Limewater

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6
Q

Test for chlorine

A

Damp blue litmus paper turns white when bleached with chlorine

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7
Q

How to carry out a flame test

A

A Nichrome wire loop dipped in hydrochloric acid then heated to sterilise
Then it should be dipped in the acid again before testing the metal
Hold the loop in the roaring blue flame of a Bunsen burner
Use the colour of the flame to identify the metal ion
If the sample is mixed then some colours can be masked

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8
Q

Cation test conditions

A

Sodium hydroxide

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9
Q

Aluminium 3+ sodium hydroxide

A

White precipitate

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10
Q

Calcium 2+ sodium hydroxide

A

White precipitate

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11
Q

Magnésium 2+ sodium hydroxide

A

White precipitate

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12
Q

What happens when you add excess sodium hydroxide to aluminium 3+

A

Aluminium ions dissolve

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13
Q

After the sodium hydroxide test how do you then distinguish between calcium and magnesium

A

Flame test

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14
Q

Copper 11 sodium hydroxide

A

Blue precipitate

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15
Q

Iron 11 sodium hydroxide

A

Green precipitate

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16
Q

Iron 111 sodium hydroxide

A

Brown precipitate

17
Q

Lithium Li+ flame test

A

Crimson

18
Q

Sodium, Na+ flame test

A

Yellow

19
Q

Potassium, K+ flame test

A

Lilac

20
Q

Calcium, Ca2+ flame test

A

Orange-red

21
Q

Copper, Cu2+

A

Green

22
Q

Carbonate test

A

Add a dilute acid to a carbonate, it fizzes and produces carbon dioxide gas

23
Q

Halides test

A

Dilute nitric acid then silver nitrate

24
Q

Iodide I- halide test

A

Yellow precipitate

25
Q

Bromide ions Br- halide test

A

Cream precipitate

26
Q

Chloride Cl- ions halide test

A

White precipitate

27
Q

How to test for sulfates

A

Adding dilute hydrochloric acid followed by barium chloride

Dilute hydrochloric acid first to remove carbonate ions that would form a precipitate with the barium ions

28
Q

Sulfate result barium chloride test

A

White precipitate

Chemistry Paper 2 (9 decks)

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