Question

Which factor is involved in each scenario below?

A)Yeast used in making beer and bread

b. 10% hydrogen peroxide decomposes at faster rate compare to 3% hydrogen peroxide.

c. Hydrogenation of a reactant is faster when powdered palladium is used instead of palladium flakes

d. Sugar dissolves faster in water at 90 oC than 30 oC.

Answer 1

A) Yeast secrets an enzyme which is essential for the Fermentation process which gives Beer formation.

B) Decomposition of H2O2 is a First Order Reaction for which reaction rate is directly proportional to the initial concentration of the reactant and H2O2 decomposes at the fster rate at 10% concentration than at 3%.

C) In Heterogeneous catalysis rate of catalysis will be higher for the catalyst with the larger surface area.Hydrogenation is an example of heterogeneous catalysis. In powdered form the surface area pf Palladium will be larger than in Flake forms and hence hydrogenation

D) Dissolution of Sugar is an Endothermic process and hence increase in temperature will enhance the rate of sugar dissolution. Therefore Sugar dissolves faster at 90 ^oC than at 30 ^oC.

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