Chemical Reactions - Irreversible & Precipitation Reactions

The video tutorial explains the classification of chemical reactions into irreversible and reversible types. It focuses on irreversible reactions, where reactants are fully converted into stable products that do not revert to reactants. Examples include the decomposition of limestone and the burning of magnesium. Irreversible reactions are unidirectional and often involve zero activation energy, as seen in precipitation reactions like the formation of silver chloride.

What characterizes an irreversible reaction?

• The reaction goes to completion and does not reverse.

• The reaction can easily reverse to form reactants.

• The reaction requires a catalyst to proceed.

• The reaction occurs only in closed vessels.

Why is the decomposition of limestone considered an irreversible reaction?

• Because it requires a high temperature to proceed.

• Because it occurs in a closed vessel.

• Because the products are unstable.

• Because the products do not react to form the original reactants.

What makes magnesium oxide a stable product in its reaction?

• It requires a catalyst to form.

• It does not react with other substances to revert to reactants.

• It is formed in a reversible reaction.

• It can easily decompose back into magnesium and oxygen.

Which of the following is an example of a precipitation reaction?

• Burning of magnesium in air.

• Formation of silver chloride from silver nitrate and sodium chloride.

• Decomposition of limestone.

• Formation of magnesium oxide from magnesium.

What is meant by zero activation energy in irreversible reactions?

• The reaction is spontaneous and exothermic.

• The reaction can occur at any temperature.

• The minimum energy required for reactants to convert into products is zero.

• The reaction requires no energy to start.