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WEEK 8
TOPIC: CARBON AND ITS COMPOUND
CONTENT:
PERIOD 1: CARBON(IV) OXIDE: PREPARATION AND USES
FORMATION / PREPARATION OF CARBON(IV) OXIDE (CO2)
In excess air, there is complete combustion; carbon (iv) oxide is produced but in the limited supply of air carbon normally reacts with oxygen to produce carbon(ii) oxide. The equation of reaction is given below for the two reactions.
C(s)+ CO2(g) + heat (sufficient supply of air)
2C(s) + 2CO(g) + heat (limited supply of air)
Other methods of preparation of CO2 are:
CaCO3(s) → CaO(s) + CO2
2NaHCO3(s) → Na2CO3(s) + H2O +CO2(g)
Na2CO3(s) + 2HCl(aq)→ 2NaCl(aq) + H2O(l) + CO2(g)
KHCO3(s) + HNO3(aq) → KNO3(aq) + H2O(l) + 2CO2(g)
(iv) The fermentation of glucose by enzyme (zymase)
C6H12O6(ag) → 2C2H5OH(aq) + 2CO2(g)
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