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Chemistry > C3 Forensic science > Flashcards

C3 Forensic science Flashcards

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1
Q

What colour does barium burn?

A

Green

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2
Q

What colour does lithium burn?

A

Crimson

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3
Q

What colour does potassium burn?

A

Lilac

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4
Q

What colour does calcium burn?

A

Red

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5
Q

What colour does sodium burn?

A

Yellow

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6
Q

When Fe2+ and sodium hydroxide react what colour precipitate forms?

A

Green

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7
Q

When CU2+ and sodium hydroxide react what colour precipitate forms?

A

Blue

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8
Q

When Ca2+ and sodium hydroxide react what colour precipitate forms?

A

White

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9
Q

When Fe3+ and sodium hydroxide react what colour precipitate forms?

A

Brown

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10
Q

When Al3+ and sodium hydroxide react what colour precipitate forms?

A

White (initially) then it redissolves in excess NaOH to form a colourless solution

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11
Q

When Mg2+ and sodium hydroxide react what colour precipitate forms?

A

White

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12
Q

How do you test for a carbonate ion?

A

React the substance with a dilute acid, pass the gas through limewater and see if it goes cloudy
acid + carbonate –> salt + water + CO2
And CO2 turns limewater cloudy

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13
Q

How can you test for halide ion?

A

Add dilute nitric acid, then silver ntrate solution

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14
Q

What ion gives a white precipitate when dilute nitric acid, then silver nitrate solution is added

A

Chloride

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15
Q

What ion gives a cream precipitate when dilute nitric acid, then silver nitrate solution is added

A

Bromide

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16
Q

What ion gives a yellow precipitate when dilute nitric acid, then silver nitrate solution is added

A

Iodide

17
Q

How do you test for sulfate ions?

A

Add dilute HCl, then a barium chloride solution.

If a white precipitate of barium sulfate forms the original compound was a sulfate

18
Q

What ion burns green?

A

Barium

19
Q

What ion burns yellow?

A

Sodium

20
Q

What ion burns lilac?

A

Potassium

21
Q

What ion burns red?

A

Calcium

22
Q

What ion burns crimson?

A

Lithium

23
Q

What do you need to do before conducting a flame test?

A

Clean the wire loop you want to use to put the sample on in hydrochloric acid then rinse it using distilled water to prevent contamination

24
Q

When ion forms a white precipitate when reacted with sodium hydroxide?

A

Calcium or Magnesium or Aluminium

25
Q

When ion forms a blue precipitate when reacted with sodium hydroxide?

A

Copper

26
Q

When ion forms a green precipitate when reacted with sodium hydroxide?

A

Fe2+

27
Q

When ion forms a brown precipitate when reacted with sodium hydroxide?

A

Fe3+

28
Q

How do you test to see if a white precipitate formed during a reaction between an ion and sodium hydroxide is Aluminium?

A

You wait and see if it redissolves in NaOH to form a colourless solution

Chemistry (5 decks)

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