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Chemistry Unit 3 > Analysing Substances > Flashcards

Analysing Substances Flashcards

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1
Q

What can flame tests be used to identify?

A

Metal ions

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2
Q

Which 5 metal ions produce coloured flames?

A

Lithium, sodium, calcium, potassium, barium

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3
Q

What colour flame do lithium compounds have?

A

Crimson

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4
Q

What colour flame do sodium compounds have?

A

Yellow

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5
Q

What colour flame do potassium compounds have?

A

Lilac

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6
Q

What colour flame do calcium compounds have?

A

Red

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7
Q

What colour flame do barium compounds have?

A

Green

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8
Q

Which 3 metal ions form white precipitates with sodium hydroxide solution?

A

Aluminium, calcium, magnesium

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9
Q

What happens to an aluminium hydroxide precipitate when excess sodium hydroxide solution is added?

A

It dissolves

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10
Q

What do copper (ii), iron (ii) and iron (iii) form with sodium hydroxide solution?

A

Coloured precipitates

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11
Q

What colour precipitate does copper (ii) form with sodium hydroxide solution?

A

Blue

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12
Q

What colour precipitate does iron (ii) form with sodium hydroxide solution?

A

Green

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13
Q

What colour precipitate does iron (iii) form with sodium hydroxide solution?

A

Brown

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14
Q

What do carbonate ions react with to form carbon dioxide?

A

Dilute acids

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15
Q

What substance does carbon dioxide produce a white precipitate in?

A

Lime water

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16
Q

What do halides form precipitates with?

A

Silver nitrate solution, in the presence of dilute nitric acid

17
Q

What colour precipitate does silver chloride form?

A

White

18
Q

What colour precipitate does silver bromide form?

A

Cream

19
Q

What colour precipitate does silver iodide form?

A

Yellow

20
Q

What do sulfate ions form precipitates with?

A

Barium chloride solution, in the presence of dilute hydrochloric acid

21
Q

What colour precipitate do sulfate ions have?

A

White

22
Q

The volumes of acid and alkali solutions can be measured by…

A

Titration using a suitable indicator

23
Q

If the concentration of one reactant is known, the results of the titration can be used to find…

A

The concentration of the other reactants

Chemistry Unit 3 (11 decks)

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