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GCSE Chem > Tests > Flashcards

Tests Flashcards

1
Q

Method for flame tests

A

Dip clean platinum loop wire in HCl and then hold it in the flame. Dip into substance and then hold in flame

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2
Q

Flame test for calcium

A

Orange - Red flame

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3
Q

Flame test for lithium

A

Red flame

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4
Q

Flame test for potassium

A

Burns with lilac flame

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5
Q

Copper flame test

A

Blue- green flame

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6
Q

Insoluble coloured precipitate method

A

Add sodium hydroxide NaOH to the mystery solution and see if a coloured insoluble hydroxide is formed

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7
Q

If copper (II) hydroxide is formed

A

Blue precipitate

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8
Q

If iron (II) hydroxide is formed

A

Green precipitate

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9
Q

If iron (III) hydroxide is formed

A

Reddish brown precipitate

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10
Q

Ammonium compound + NaOH

A

Gives off ammonia

The test for ammonia gas is damp red litmus paper will turn blue

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11
Q

Test for carbonates

A

Add dilute HCl to sample

CO2 released if carbonate present

Carbonate + acid—> carbon dioxide + water

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12
Q

Test for sulfates

A

Add dilute HCl followed by Barium chloride and if sulfates are present it produces a white precipitate

Barium ions + sulfate ions —> barium sulfate

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13
Q

Test for halides

A

Add dilute nitric acid followed by silver nitrate solution

Chloride- white precipitate of silver chloride

Bromide - cream precipitate of silver bromide

Iodide - yellow precipitate of silver iodide

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14
Q

Test for chlorine gas

A

Chlorine gas bleached damp blue litmus paper

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15
Q

Test for oxygen gas

A

Relights a glowing splint

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16
Q

Test for carbon dioxide gas

A

Turns limewater cloudy

17
Q

Test for hydrogen gas

A

Hydrogen makes a squeaky pop with lit splint

18
Q

Ammonia gas test

A

Turns damp red litmus paper blue

19
Q

Wet copper sulfate colour

A

Blue

20
Q

Dry copper sulfate colour

A

White

GCSE Chem (7 decks)

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