A reaction occurs inside of a flask. At first, the forward reaction rate is slow

Question

A reaction occurs inside of a flask. At first, the forward reaction rate is slow, but with time it speeds up. Simultaneously, the reverse reaction rate starts out fast but slows down as time proceeds.

From this information, describe what was initially in the reaction flask in terms of reactants and products, and explain your answer.

The reaction vessel must have been filled with just the products or mostly products. The higher the concentration of the products, the lower the forward-reaction rate and the higher the reverse-reaction rate. The reaction vessel must have been filled with just the reactants or mostly reactants. The higher the concentration of the reactants, the lower the forward-reaction rate and the higher the reverse-reaction rate. There is not enough data to answer the question, since the correlation between the rate of a reaction and the concentration is unique for each reaction. The reaction vessel must have been filled with equal amounts of reactants and products. The rate of a forward reaction is typically low at equilibrium.

Explanation / Answer

At first, the forward reaction rate is slow, this means conversion of reactants to products is slow. This is possible only when the products concentrations are high.

Since initially the products concentrations are hight, the reverse reaction that is conversion of products to reactants is fast.

Hence,the reaction vessel must have been filled with just the products or mostly products. The higher the concentration of the products, the lower the forward-reaction rate and the higher the reverse-reaction rate.

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