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Chemistry
Paper 2
Chemical analysis
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Shekinah Obare
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Subdecks (4)
Retrieval practice
GCSE > Chemistry > Paper 2 > Chemical analysis
89 cards
Identification of Ions by Chemical and Spectroscopic Means
GCSE > Chemistry > Paper 2 > Chemical analysis
26 cards
Identification of Common Gases
GCSE > Chemistry > Paper 2 > Chemical analysis
25 cards
Purity, Formulations and Chromatography
GCSE > Chemistry > Paper 2 > Chemical analysis
25 cards
Cards (180)
Pure substance
A single
element
or
compound
, not
mixed
with any other
substance
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Formulation
A
mixture
of
compounds
in
measured quantities
that has been
designed
as a
useful product
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Paper chromatography
1. Draw
start line
2. Place
sample
on
line
3. Fill
beaker
with
solvent
4.
Hang paper
in
beaker
5.
Solvent travels
up
paper
6. Mark
finish line
7.
Dry paper
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Rf value
Distance moved by the
spot
/ distance moved by
solvent
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Rf value of 0.85
Compound has
higher affinity
for the
solvent
than for the
paper
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Tests for gases
Hydrogen
- pop with
burning splint
Oxygen
-
glowing splint relights
Carbon dioxide
- turns
limewater milky
Chlorine
-
bleaches damp litmus paper
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Flame test results
Lithium
compounds -
crimson red
flame
Sodium
compounds -
yellow
flame
Potassium
compounds -
lilac
flame
Calcium
compounds -
orange red
flame
Copper
compounds -
green
flame
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Sodium hydroxide tests
1.
Cu2+
forms
blue precipitate
2.
Fe2+
forms
dirty green precipitate
3.
Fe3+
forms
brown precipitate
4.
Al3+
,
Ca2+
,
Mg2+
form
white precipitates
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Carbonate test
Add
dilute acid
,
fizzing
observed as
CO2
is released
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Sulfate test
Add
BaCl2
solution,
white
precipitate of
BaSO4
forms
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Halide tests
Add AgNO3
(
acidified
)
Chlorides
-
white precipitate AgCl
Bromides
-
cream precipitate AgBr
Iodides
-
yellow precipitate AgI
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Instrumental methods
Accurate
,
sensitive
and
rapid
methods useful when sample amount is very
small
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Flame emission spectroscopy
Spectroscope measures
exact wavelength
of
light
emitted by
metal ion
Intensity of light emitted measures
concentration
of
metal ion
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Cations
Positive
ions
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Anions
Negative
ions
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See all 180 cards