Learning the Mechanisms : Investigating the Breakdown of Ammonia and Reaction Rates

The video tutorial explains the decomposition of ammonia into nitrogen and hydrogen, highlighting that the rate of hydrogen formation is three times that of nitrogen. It details how to compute the rate of nitrogen formation using ammonia decomposition and equates rate expressions for decomposition reactions. Finally, it defines the rate of reaction as the change in concentration of reactants or products divided by stoichiometric coefficients.

What is the relationship between the rate of formation of hydrogen and nitrogen in the decomposition of ammonia?

• The rate of formation of hydrogen is thrice that of nitrogen.

• The rate of formation of hydrogen is twice that of nitrogen.

• The rate of formation of hydrogen is half that of nitrogen.

• The rate of formation of hydrogen is equal to that of nitrogen.

How is the rate of formation of nitrogen expressed in terms of ammonia decomposition?

• As minus one-third delta NH3 by delta T

• As minus half delta NH3 by delta T

• As minus delta NH3 by delta T

• As minus two-thirds delta NH3 by delta T

What is the purpose of equating rate expressions in a decomposition reaction?

• To find the equilibrium constant

• To determine the stoichiometric coefficients

• To balance the chemical equation

• To relate the rates of different reactants and products

In a balanced chemical reaction, how is the rate of reaction defined?

• As the rate of change of concentration of the excess reactant

• As the rate of change of concentration of any reactant or product divided by a stoichiometric coefficient

• As the rate of change of concentration of the limiting reactant

• As the rate of change of concentration of any reactant or product

What role do stoichiometric coefficients play in determining the rate of reaction?

• They determine the speed of the reaction

• They are used to balance the chemical equation

• They have no role in determining the rate of reaction

• They are used to divide the rate of change of concentration