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Chemistry Paper 2 > Chemical Analysis > Flashcards

Chemical Analysis Flashcards

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1
Q

Pure substance

A

1 compound or element not mixed with anything else

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2
Q

What tells you how pure a substance is?

A

Boiling or melting point

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3
Q

Test for chlorine gas

A

Bleaches damp litmus paper white

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4
Q

Test for oxygen gas

A

Glowing splint inside test tube

Oxygen will relight glowing splint

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5
Q

Test for carbon dioxide gas

A

Bubbling carbon dioxide through limewater causes solution to turn cloudy

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6
Q

Test for hydrogen gas

A

Hold a burnin splint at open end of a test tube containing hydrogen

“Squeaky pop”

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7
Q

Mobile phase of chromatography

A

Where molecules can move

Always liquid or gas

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8
Q

Stationary phase of chromatography

A

Molecules can’t move

Solid of very thick liquid

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9
Q

Rf value calculation

A

Distance travelled by substance ÷ distance travelled by solvent

B ÷ A

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10
Q

What is the Rf value affected by?

A

Solvent

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11
Q

What do tests for anions give?

A

Precipitates

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12
Q

What does dilute acid detect?

A

Carbonates

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13
Q

What do HCl and Barium Chloride detect?

A

Sulfates

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14
Q

What do Nitric Acid and Silver Nitrate detect?

A

Halides

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15
Q

What does a chloride give?

A

White precipitate

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16
Q

What does a bromide give?

A

Cream precipitate

17
Q

What does an iodide give?

A

Yellow precipitate

18
Q

What identify metal ions?

A

Flame tests

19
Q

What colour flame do lithium ions produce?

A

Crimson

20
Q

What colour flame do sodium ions produce?

A

Yellow

21
Q

What colour flame do potassium ions produce?

A

Lilac

22
Q

What colour flame do calcium ions produce?

A

Orange-red

23
Q

What colour flame do copper ions produce?

A

Green

24
Q

What colour precipitate do calcium ions produce?

A

White

25
Q

What colour precipitate do copper (II) produce?

A

Blue

26
Q

What colour precipitate do Iron (II) produce?

A

Green

27
Q

What colour precipitate do Iron (III) produce?

A

Brown

28
Q

What colour precipitate do aluminium ions produce?

A

White then colourless

29
Q

What colour precipitate do magnesium ions produce?

A

White

30
Q

Advantages of using machines to analyse unknown substances

A

Very sensitive so can detect smallest amounts of a substance

Very fast

Very accurate

Chemistry Paper 2 (13 decks)

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