Question

2) The hydrogen peroxide is added slowly to reduce the peak concentration of bromine (Br₂) generated. What effect does lowering the bromine concentration have on the rate of the main reaction?

Group of answer choices

A) The effect on the reaction rate can not be determined.

B) A lower bromine concentration makes the reaction faster..

C) A lower bromine concentration makes the reaction slower.

D) A lower bromine concentration has no effect on the reaction rate.

Answer 1

decomposition reaction is

2 H2O2 ............> 2 H2O + O2.

In this reaction, Br2 act as catalyst.

1. H2O2(aq) + Br2(aq) .............> 2Br- + 2H+ + O2(g)

and

2. H2O2(aq) + 2 Br- + 2H+ .................> Br2(aq) + 2H2O(l)

Br2 is not consumed in the reaction.

thus

with change in concentration of Br2, reaction rate can not change.

option

D) A lower bromine concentration has no effect on the reaction rate. (answer)