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chemistry > chemical tests > Flashcards

chemical tests Flashcards

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1
Q

crimson flame

A

lithium

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2
Q

yellow flame

A

sodium

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3
Q

lilac flame

A

potassium

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4
Q

orange/red flame

A

calcium

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5
Q

green flame

A

copper

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6
Q

sodium hydroxide: soluble white percipitate

A

aluminium

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7
Q

sodium hydroxide: insoluble white percipitate

A

calcium or magnesium

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8
Q

test for carbonate ions

A
  • add dilute acid to sample
  • bubble gas (effervescence) produced through limewater
  • turns cloudy/milky
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9
Q

test for halide ion

A
  • add dilute nitric acid
  • add silver nitrate
  • determine colour of precipitate
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10
Q

silver nitrate + white precipitate

A

chloride ion

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11
Q

silver nitrate + cream precipitate

A

bromide ion

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12
Q

silver nitrate + yellow precipitate

A

iodide ion

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13
Q

test for sulfate ion

A
  • add dilute hydrochloric acid
  • add barium chloride
  • white precipitate = sulfate ions present
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14
Q

sodium hydroxide: blue precipitate

A

copper (Cu2+)

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15
Q

sodium hydroxide: green precipitate

A

iron II (Fe2+)

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16
Q

sodium hydroxide: brown precipitate

A

iron III (Fe3+)

17
Q

what is the formula of an alkane?

A

C(n)H(2n+2)

18
Q

what is the formula of an alkene?

A

C(n)H(2n)

19
Q

what is the test for alkenes?

A
  • shake with bromine water
  • colour change from orange to colourless indicates the presence of alkenes

chemistry (3 decks)

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