Shifts in Equilibrium — Unit test

Question 15 • IA-Chemistry A Survey of Chemistry A

What is the main reason that it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose?

Answer

The activation energy needs to be overcome in the reaction.

The activation energy must be removed from the intermediates.

The sulfuric acid has to be consumed before the reaction takes place.

The sucrose molecules must rearrange to become the catalyst.

Explanation

A reaction may take time to start because its reactants need enough energy to overcome the activation energy barrier. In the sucrose dehydration reaction, sulfuric acid acts as a dehydrating agent, but the reaction still needs this initial energy to proceed. Therefore, the correct choice is “The activation energy needs to be overcome in the reaction.”

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