Formulas
Colours
Oxidants
Reductants
"Surprise"
100
What is the formula of the iodate ion?
IO3-
100
What is the colour of the Mn2+ ion?
Pale pink, dilute solutions = colourless
100
What is oxygen (O2) reduced to?
water, H2O
100
What is hydrogen sulfide oxidised to?
sulfur, S
100
What is observed if potassium iodate is added to potassium iodide in the presence of an acid?
Colourless solutions turn brown (due to formation of I2)
200
What is the formula of the chromate ion?
CrO4 2-
200
What is the colour of the CrO4 2-
Yellow
200
What is manganese dioxide (MnO2) reduced to?
Mn2+
200
What is sulfite (SO32-) oxidised to?
sulfate ion, SO4 2-
200
What is observed if potassium permanganate is added to hydrogen peroxide?
purple solution becomes colourless and colourless (oxygen) gas is released
300
What is the formula of manganate ion?
MnO4 2-
300
What is the colour of the chlorine gas?
pale green gas
300
What is hydrogen peroxide (H2O2) reduced to?
water, H2O
300
What is thiosulfate (S2O32-) oxidised to?
tetrathionate ion, S4O6 2-
300
What would you observe if copper is placed into nitric acid?
copper metal appears to dissolve and the solution appears to turn green, while a brown gas is released
400
What is the formula of tetrathionate?
S4O6 2-
400
What is the colour of the CuI precipitate?
White
400
What is nitrate (NO3-) reduced to?
nitrogen dioxide, NO2
400
What is hydrogen peroxide oxidised to?
oxygen, O2
400
What is the oxidation number of oxygen in hydrogen peroxide, H2O2?
-1
500
What is the formula of Oxalic acid?
(COOH)2
500
What is the colour of bromine?
orange/brown
500
What is copper(II) (Cu2+) reduced to in the presence of iodide ions?
Copper(I) I, CuI
500
What is oxalic acid oxidised to?
Carbon dioxide, CO2
500
What term is used to describe species that can BOTH oxidise and reduce?
Disproportionation
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