POCKET REVISION
THE SCIENCE SCRIBE
LV II CHEMISTRY: REDOX
BY LIAN SOH
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1
CHLORINE
Cl2
Pale green gas/solution
Bubbles of chlorine gas are…
2
CHLORIDE
-
Cl
Clear colourless
Sodium chloride solution is…
…bubbles were observed.
3
BROMINE
Br2
Red liquid or orange solution
…mixed with bromine water.
…orange decolourises.
4
BROMIDE
-
Br
Clear colourless
Potassium bromide solution
is…
…orange colour forms
5
NITRIC ACID (DIL.)
+
H
Clear colourless solution
…added to dilute nitric acid.
…bubbles observed.
6
HYDROGEN
H2
Clear colourless gas
Bubbles of hydrogen gas are
…
…litmus turns red.
7
IRON (III) IONS
3+
Fe
Orange/yellow solution
…added to iron sulfate
solution.
…orange turns green.
8
IRON (II) IONS
2+
Fe
Pale green solution
Iron (II) sulfate solution is…
…green turns pale yellow.
9
COPPER (II) IONS
2+
Cu
Blue solution.
…added to copper sulfate
solution.
…blue disappears, shiny orange/pink
solid forms.
10
COPPER
Cu
Shiny orange/pink solid.
Copper metal is…
…metal gets smaller; reaction gains a
blue tint.
11
HYPOCHLORITE
-
OCl
Clear colourless
…added to bleach.
12
(REV. ON 2)
CHLORIDE
Cl
-
Clear colourless
Potassium chloride solution
is…
…bubbles observed.
13
IODINE
I2
Grey purple (s). Brown (aq).
…added to iodine solution.
…brown decolourises.
14
IODIDE
I
-
Clear colourless
Sodium iodide is…
…grey solid forms; light brown tint to
solution also observed.
15
OXYGEN
O2
Clear colourless gas
…reacted with oxygen.
16
OXIDE
2-
O
Clear colourless
Choose a different
left-sided page.
17
HYDROGEN PEROXIDE
H2O2
Clear colourless liquid
...added to hydrogen
peroxide.
18
WATER
H2O
Clear colourless liquid
Choose a different
left-sided page.
19
DICHROMATE
2-
Cr2O7
Orange solution
…mixed with potassium
dichromate.
…orange turns green.
20
CHROMIUM (III)
3+
Cr
Green/blue solution.
Choose a different
left-sided page.
21
PERMANGANATE
-
MnO4
Purple solution
…mixed with potassium
permanganate.
…purple decolourises.
22
MANGANESE (II)
Mn
2+
Colourless solution
Choose a different
left-sided page.
23
NITRIC ACID (CONC.)
-
NO3
Clear colourless solution
…mixed with concentrated
nitric acid.
…brown gas evolves.
24
NITROGEN DIOXIDE
NO2
Brown gas.
Choose a different
left-sided page.
25
IODATE
-
IO3
Clear colourless solution
…mixed with sodium iodate
solution.
(REV. ON 14)
IODIDE
26
I
-
Clear colourless solution
Sodium iodide is…
…grey solid forms; light brown tint to
solution also observed.
27
SULFUR
S
Yellow solid
Choose a different
right-sided page.
28
HYDROGEN SULFIDE
H2S
Clear colourless gas
Gaseous hydrogen sulfide
is…
…yellow solid forms.
29
SULFATE
2-
SO4
Clear colourless
Choose a different
right-sided page.
30
SULFUR DIOXIDE
SO2
Clear colourless gas
Gaseous sulphur dioxide is…
31
SULFATE
2-
SO4
Clear colourless
Choose a different
right-sided page.
32
SULFITE
2-
SO3
Clear colourless solution
Sodium sulfite is…
33
SULFATE
2-
SO4
Clear colourless
Choose a different
right-sided page.
34
HYDROGEN SULFITE
-
HSO3
Clear colourless solution
Sodium hydrogen sulfite is…
35
OXYGEN
O2
Clear colourless liquid
Choose a different
right-sided page.
36
HYDROGEN PEROXIDE
H2O2
Clear colourless liquid
Hydrogen peroxide is…
…effervescence was observed
37
(REV. ON 8)
IRON (III)
3+
Fe
Orange/yellow solution
reacted with iron (III)
chloride solution.
…yellow turned solution turns pale
green.
38
IRON
Fe
Grey shiny solid
A nail is…
…nail gained an orange hint.
39
MAGNESIUM (II)
Mg
2+
Clear colourless solution
reacted with magnesium
nitrate solution.
…grey solid particles form.
40
MAGNESIUM
Mg
Shiny grey solid
Magnesium metal is…
…metal gets smaller.
OXIDATION NUMBERS (ANS)
PAGE
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
0
-1
0
-1
+1
0
+3
+2
+2
0
+1
-1
0
-1
0
-2
PAGE
PAGE
17)
18)
19)
20)
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
31)
32)
33)
34)
35)
36)
37)
38)
39)
40)
-1
-2
+6
+3
+7
+2
+5
+4
+5
-1
0
-2
+6
+4
+6
+4
+6
+4
0
-1
+3
0
+2
0
©Lian Soh 2013