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Chemistry > identifying gases and ions (51-53) (paper 1) > Flashcards

identifying gases and ions (51-53) (paper 1) Flashcards

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1
Q

what is the chemical test and result for hydrogen gas

A
  • lit split
    = squeaky pop
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2
Q

what is the chemical test and result for oxygen

A
  • glowing splint
    = relights
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3
Q

what is the chemical test and result for carbon dioxide

A
  • add HCl
  • bubble through limewater
    = goes cloudy white
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4
Q

what is the chemical test and result for chlorine gas

A
  • damp blue litmus paper
    = may turn red then bleached white
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5
Q

what is the chemical test and result for ammonia gas

A
  • add NaOH and warm gently
  • damp red litmus paper
    = turns blue
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6
Q

what is the chemical test and result for water

A
  • white anhydrous copper sulfate
    = blue
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7
Q

what is the physical test and result for water

A
  • heat until boiling
    = will boil at 100
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8
Q

how is a flame test carried out

A
  • dip a nichrome wire into an acid (must be unreactive, colourless & high melting point)
  • dip into the ionic solid
  • put it in roaring bunsen flame
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9
Q

why do we put the nichrome wire in a roaring bunsen flame

A

so the colour of the flame will not interfere

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10
Q

what is the colour of the flame for lithium

A

red

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11
Q

what is the colour of the flame for sodium

A

yellow

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12
Q

what is the colour of the flame for potassium

A

lilac

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13
Q

what is the colour of the flame for calcium

A

red-orange

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14
Q

what is the colour of the flame for copper

A

blue-green

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15
Q

when do you do a flmae test

A

for a metal ion

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16
Q

what is the chemical test and result for sulphat

A
  • add HCl
  • add BaCl2
    = white precipitate
17
Q

what do you do when testing for a metal ion in a solution

A

add NaOH

18
Q

what do you do when identifying copper

A

add NaOH

19
Q

what do you do when identifying iron

A

add NaOH

20
Q

what is the colour of the precipitate fromed for copper

A

blue precipitate (Cu(OH)2)

21
Q

what is the colour of the precipitate formed for iron (II)

A

green precipitate (Fe(OH)2)

22
Q

what is the colour of the precipitate formed from iron (III)

A

brown precipitate (Fe(OH)3)

23
Q

how do you test for non-metall ions (chlorine, bromine, iodine)

A
  • add HNO3 (aq)
  • add AgNO3 (aq)
24
Q

what is the result for identifying chloride

A

white precipitate (AgCl)

25
Q

what is the result for identifying bromide

A

cream precipitate (AgBr)

26
Q

what is the result for identifying iodine

A

yellow precipitate (AgI)

27
Q

what are the instructions for writing an ionic equation for a precipitate

A
  • write the formula of the precipitate on right side
  • on left right the ions making it up
  • balance
  • state symbols

Chemistry (19 decks)

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