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Emmanuel College Chemistry > Paper 2- Unit 8 Chemical tests (Triple Only) > Flashcards

Paper 2- Unit 8 Chemical tests (Triple Only) Flashcards

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1
Q

Which metal gives a green flame?

A

Copper Cu 2+

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2
Q

Which metal gives a orange-red flame?

A

Calcium Ca2+

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3
Q

Which metal give a lilac flame?

A

Potassium K+

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4
Q

Which metal gives a yellow flame?

A

Sodium Na+

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5
Q

Which metal gives a crimson flame?

A

Lithium Li+

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6
Q

What is hydrochloric acid used for?

A

Clean the loop/wire (1)

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7
Q

Describe how to carry out a flame test (4)

A

Dip clean loop into sample
Place in blue flame (bunsen burner)
Write down colour
Clean loop with HCl

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8
Q

Sodium hydroxide and aluminium (1)

A

Whiteppt

dissolved in excess NaOH

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9
Q

Sodium hydroxide and calcium (1)

A

White ppt

doesn’t dissolve

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10
Q

Sodium hydroxide and magnesium (1)

A

White ppt

doesn’t dissolved in excess NaOH

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11
Q

Sodium hydroxide and iron (II) (1)

A

green ppt

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12
Q

Sodium hydroxide and Iron (III) (1)

A

red- brown ppt

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13
Q

Sodium hydroxide and copper (1)

A

Blue ppt formed

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14
Q

What is the test for a sulphate? (1)

A

white ppt formed

with barium chloride solution

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15
Q

What is the test for a carbonate?

A

add acid

bubbles of CO2 given off

test gas with limewater

turns clear to cloudy

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16
Q

What is the test for the halides? (2)

A

Add nitric acid

then silver nitrate

chloride = white ppt
Bromide = cream ppt
Iodide = yellow ppt
17
Q

Green flame

A

Copper Cu2+

18
Q

orange red flame

A

Calcium Ca2+

19
Q

a lilac flame

A

Potassium K+

20
Q

yellow flame

A

Sodium Na+

21
Q

crimson

A

Lithium Li+

22
Q

How do you clean the loop/wire? (flame test)

A

Clean hot wire

with hydrochloric acid

23
Q

Sodium hydroxide test produces white ppt

A

either aluminium, calcium or magnesium

24
Q

Sodium hydroxide test produces iron (II)

A

green ion

25
Q

Sodium hydroxide test produces iron (III)

A

brown ion

26
Q

Sodium hydroxide test produces blue ppt

A

copper ion

Emmanuel College Chemistry (15 decks)

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