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tests Flashcards

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1
Q

What is the test and result for hydrogen

gas?

A

Test: add BURNING splint to the gas
Result: burns with a squeaky pop

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2
Q

What is the test for oxygen?

A

Test: add GLOWING splint to the gas
Result: splint relights

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3
Q

What is the test and result for carbon

dioxide gas?

A

Test: bubble gas into limewater
Result: limewater turns cloudy

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4
Q

What is the test and result for chlorine gas?

A

Test: add damp blue litmus paper
Result: litmus paper bleaches and turns white

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5
Q

What is the colour of the flame produced from lithium?

A

Crimson

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6
Q

What is the colour of the flame produced from
a COPPER containing compound?

A

Green

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7
Q

What is the colour of the flame produced from
a SODIUM containing compound?

A

Yellow

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8
Q

What is the colour of the flame produced from
a POTASSIUM containing compound?

A

Lilac

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9
Q

What is the colour of the flame produced from
a CALCIUM containing compound?

A

Orange-red

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10
Q

Which solutions produce white precipitates
with sodium hydroxide?

A

Solutions containing aluminium, magnesium or calcium ions

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11
Q

How can aluminium ions be distinguished from
calcium and magnesium ions?

A

Its precipitate will dissolve in excess sodium hydroxide

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12
Q

What colour precipitate forms from adding
sodium hydroxide to copper (II) ions?

A

Blue

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13
Q

What colour precipitate forms from adding
sodium hydroxide to iron (II) ions?

A

Green

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14
Q

What colour precipitate forms from adding
sodium hydroxide to iron (III) ions?

A

Brown

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15
Q

What is the test for carbonate ions?

A

Add hydrochloric acid, test gas formed with limewater

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16
Q

What is the test for halide ions?

A

Add silver nitrate and nitric acid to generate a silver halide precipitate

17
Q

What colour are the halide precipitates?

A

chloride=white,
bromide=cream,
iodide=yellow

Chickens Be Idiots

18
Q

What is the test for sulfate ions?

A

Add barium chloride and hydrochloric acid, forms white precipitate

19
Q

What instrumental method can be used to test
for metal ions?

A

Flame emission spectroscopy

20
Q

how how do complet the flame test

A

1.Nichrome or platmumeore cleaned with concentrated HCL
2. dipped in sample compound
3. place in roaring blue flame
4. record colour

yellow flame=mask colour
clean wire =mixture =mask cololurs

Chemistry (27 decks)

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