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chemistry nsaa > Chemical tests > Flashcards

Chemical tests Flashcards

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1
Q

Test for hydrogen

A

A burning splint at the open end of a test tube explodes with a SQUEAKY POP

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2
Q

Test for oxygen

A

Relights a glowing splint

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3
Q

Carbon dioxide

A

When bubbled through limewater (aqueous Ca(OH)2) the limewater will go cloudy, cloudy when shaken with the gas. Carbon dioxide will also extinguish a glowing splint.

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4
Q

Test for Chlorine gas

A

damp blue litmus paper will turn red and then be bleached turning white

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5
Q

Test for carbonates

A

Add a DILUTE ACID and observe EFFERVESCENCE as CO2 is produced

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6
Q

Halides

A

Add AgNO3 acidified in nitric acid in an aqueous solution and observe these precipitates. White precipitate for chloride, cream for bromide and yellow for iodide

White = Cl-
Cream = Br-
Yellow = I-
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7
Q

Sulfates

A

Add BaCl2 (barium chloride) acidified in HCl in an aqueous solution and observe a white precipitate of insoluble Barium Sulphate

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8
Q

Test for metal cations

A

Add NaOH (aq)

Fe2+ = green 
Fe3+ = brown 
Cu2+ = blue

Al3+, Ca2+, Mg2+ = white precipitate

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9
Q

Lithium flame test

A

CRIMSON RED

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10
Q

Potassium flame test

A

LILAC

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11
Q

Sodium

A

YELLOW ORANGE

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12
Q

Calcium

A

RED ORANGE

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13
Q

Copper

A

GREEN

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14
Q

Test for the presence of water

A

Add anhydrous copper (II) sulphate and observe a colour change from white to blue (CuSO4)

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15
Q

Solubility of nitrates

A

All soluble

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16
Q

Solubility of Chlorates

A

all soluble

17
Q

solubility of sodium salts

A

all soluble

18
Q

solubility of potassium salts

A

all soluble

19
Q

solubility of ammonium salts

A

all soluble

20
Q

solubility of hydroxides

A

All insoluble except

soluble : sodium, potassium and ammonium
mildly: calcium, barium (group 2 hydroxides get more insoluble up the group)

21
Q

solubility of oxides

A

Insoluble

except Group 1A which are usually soluble)

22
Q

solubility of metal halides

A

All soluble

Except: Pb(hot water only), Ag and mercury (I) Hg

23
Q

solubility of sulphates

A

All soluble

except: Pb, Hg, Barium and Calcium (group 2 sulphates get more insoluble down the group)

chemistry nsaa (3 decks)

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