PP Presentation

GAS FORMING REACTIONS

- some reactions generate gases. When carried out in an OPEN system,

the escape of the gas acts as a DRIVING FORCE for the chemical reaction

- loss of gas product pulls reaction to completion just as formation of

a precipitate

e.g.

CaCO3 (s) + 3 HCl (aq) ® CaCl2 (aq) + H2O (l) + CO2 (g) ­

Zn (s) + 2 HCl (aq) ® ZnCl2 (aq) + H2 (g) ­

NB. Each of these reactions can also be classified as one of the other

3 types of reactions - WHICH ONES ?

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