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Chemistry GCSE* > ANALYSIS > Flashcards

ANALYSIS Flashcards

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1
Q

flame test for Ca++ ions

A

brick red

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2
Q

flame test- brick red

A

Ca++

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3
Q

flame test for Na+ ions

A

intense yellow

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4
Q

Flame test - intense yellow

A

Na+

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5
Q

flame test - green flame with a blue centre

A

Cu++

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6
Q

flame test for Cu++ ions

A

green with a blue centre

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7
Q

flame test- lilac

A

K+

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8
Q

flame test for K+ ions

A

lilac flame

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9
Q

flame test - bright red

A

Li+

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10
Q

flame test for Li+ ions

A

Bright red

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11
Q

flame test results with no colouration

A

Mg++ or NH4+

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12
Q

flame test for Mg++

A

no colouration

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13
Q

flame test for NH4+ ions

A

no colouration

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14
Q

initial appearance of a Cu++ ion

A

blue

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15
Q

initial appearance of a Cu++ or Fe++ ion

A

green

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16
Q

initial appearance of a Fe+++ ion

A

yellow

17
Q

initial appearance of a Fe+++ ion

A

brown

18
Q

initial appearance of an uncombined metal

A

shiny grey or black

19
Q

initial appearance of a non transition metal ion

A

white powder or colourless solution

20
Q

Test for NH4+, ammonium ions

A

NH4+ (s) OH-(aq) -> NH3(g) + H2O(g)

1) it has a pungent smell
2) turns damp litmus blue ( its the only common alkaline gas. make sure the paper is in the gas and not the sodium hydroxide solution as this can also turn the litmus blue) - must be damp so the ammonia has forms hydroxide ions which change the colour of the litmus paper.

3) with a stopper from a bottle of concentrated hydrochloric acid it gives a white smoke -ammonium chloride
NH3(g) + HCl(g) -> NH3Cl(s)

21
Q

how do you perform a flame test

A

1) Use a platinum flame test rod and dip it into hydrochloric acid to clean it of any impurities and place in a non-luminous flame.
2) Then dip the clean rod into the substance and then back into the acid (which acts as a type of glue) then back into the unknown substance
3) The place into the bunsen burner and observe the colour of the flame.

Chemistry GCSE* (7 decks)

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