Transition Metals AQA unit 5

rate comment, correct.... just some basic notes

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Transition Metal catalysts Catalyst lowers E a
Transition Metal catalysts
Homogeneous
H2O2(aq) + Br2 2H+(aq) + 2Br-(aq) + O2(g)
H2O2(aq) + 2H+(aq) + 2Br-(aq) 2H2O +Br2(g)
more successful collision/ more particles reaching Ea= faster reaction
S2O8 (aq) + 2 I (aq) 2 SO (aq) + I2(aq)
2- -
4
2-
Slow reaction
Both ions negatively charged and repel
Iron (II)ions catalyze peroxodisulphate oxidising iodide ions to iodine
step 1 S2O82-(aq) + 2 I-(aq) 2 SO42-(aq) + I2(aq)
step 2 2Fe2+(aq)+ 2I-(aq) 2Fe2+(aq) +I2 (g)
self indicating- pale pink
another titration
Cr2O72-(aq) +14H+(aq) + 6Fe2+(aq) 2Cr3+(aq) + 7H2O(l) +6Fe3+(aq)
Other catalysts
V2O5 is used as a catalyst in the Contact Process (manufacture of sulfuric acid).
Iron in the Harber process (adsorption, heterogeneous)
Chromium(III) oxide in making methanol from carbon monoxide and water
5C2O42-(aq)+ 8H+(aq)+ 2MnO4-(aq) 2Mn2+(aq) + 10CO2(g) + 4H2O (l)
5:2 autocatalysis
8H+(aq)+ MnO4-(aq) +5Mn2+(aq) 5Mn3+(aq) + 4H2O (l)
5C2O42-(aq) +5Mn3+(aq) 10CO2(g)+ 5Mn2+(aq)

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