Introduction to Reversible Reactions and Equilibrium

The video tutorial explains reversible reactions, highlighting how they are represented and their characteristics. It discusses the exothermic and endothermic nature of reactions using ammonium chloride as an example. The concept of equilibrium, where forward and reverse reactions occur at the same rate, is also covered, emphasizing the constant amounts of reactants and products at this point.

What is a characteristic feature of reversible reactions?

• They are always exothermic.

• They do not reach equilibrium.

• They can proceed in both forward and reverse directions.

• They only proceed in one direction.

In a reversible reaction, if the forward reaction is exothermic, what can be said about the reverse reaction?

• It does not occur.

• It is endothermic.

• It is also exothermic.

• It releases no energy.

What happens when ammonium chloride is heated strongly?

• It turns into a liquid.

• It remains unchanged.

• It decomposes into ammonia and hydrogen chloride.

• It forms water and salt.

What is the nature of the reverse reaction when ammonia and hydrogen chloride reform ammonium chloride?

• It is exothermic.

• It is endothermic.

• It does not release energy.

• It requires light.

At equilibrium, what is true about the rates of the forward and reverse reactions?

• Neither reaction occurs.

• Both occur at the same rate.

• The reverse reaction is faster.

• The forward reaction is faster.