Formation of Hydrogen Iodide

The video tutorial explains the reversible reaction of hydrogen iodide formation, where hydrogen and iodine gases react at 730 Kelvin. Initially, no reaction occurs, but after 15 seconds, hydrogen and iodine molecules start forming hydrogen iodide. The forward reaction rate increases as the concentration of reactants decreases. After 30 seconds, the backward reaction begins, leading to dynamic equilibrium where the rates of forward and backward reactions are equal. A graph illustrates the concentration changes of reactants and products over time, highlighting the dynamic equilibrium stage.

What happens to the concentration of hydrogen and iodine as the reaction progresses?

• It decreases.

• It increases.

• It fluctuates randomly.

• It remains constant.

At what point does the backward reaction begin to increase?

• At the start of the reaction.

• After 15 seconds.

• When the reaction reaches completion.

• After 30 seconds.

What is indicated by the constant intensity of the purple color in the reaction mixture?

• The backward reaction is faster than the forward reaction.

• The reaction is at dynamic equilibrium.

• The forward reaction is faster than the backward reaction.

• The reaction has stopped.

What does the downward curve in the graph represent?

• Constant concentration of reactants.

• Decrease in reactant concentration.

• Increase in product concentration.

• Fluctuating concentration of products.

What does it mean when the curves in the graph are parallel?

• The backward reaction is faster than the forward reaction.

• The forward reaction is faster than the backward reaction.

• The reaction is at dynamic equilibrium.

• The reaction has stopped.