Striking a Balance : Investigating Reaction Rate and Stoichiometry

The video tutorial explains the conversion of reactant A to product B, focusing on reaction rates expressed through changes in concentration over time. It highlights the stoichiometric relationships in simple and complex reactions, such as A to 2B conversion, and applies these concepts to the formation of nitric oxide from nitrogen and oxygen. The tutorial emphasizes the importance of stoichiometric coefficients in balanced equations and how they relate to rate expressions.

How can the rate of a reaction be expressed in terms of reactant concentration?

• As a negative change in reactant concentration over time

• As a positive change in product concentration over time

• As a constant value over time

• As a positive change in reactant concentration over time

In a reaction where 1 mole of A produces 2 moles of B, how is the rate of formation of B related to the rate of disappearance of A?

• The rate of formation of B is equal to the rate of disappearance of A

• The rate of formation of B is unrelated to the rate of disappearance of A

• The rate of formation of B is twice the rate of disappearance of A

• The rate of formation of B is half the rate of disappearance of A

What is the significance of dividing the rate expression by the stoichiometric coefficient in complex reactions?

• It simplifies the reaction equation

• It balances the chemical equation

• It ensures the rate expression is consistent with stoichiometry

• It changes the reaction rate

In the formation of nitric oxide, how does the rate of formation of nitric oxide compare to the rate of disappearance of nitrogen?

• It is unrelated to the rate of disappearance of nitrogen

• It is half the rate of disappearance of nitrogen

• It is equal to the rate of disappearance of nitrogen

• It is twice the rate of disappearance of nitrogen

What does the denominator in the rate term of nitric oxide represent in the balanced equation?

• The rate of formation of nitrogen

• The rate of disappearance of oxygen

• The stoichiometric coefficient of nitric oxide

• The number of moles of nitric oxide