Move Quickly : Exploring First-Order Reactions

The video tutorial explains the importance of time in reaction rates and introduces integral rate laws for first, second, and zero order reactions. It focuses on first order reactions, detailing how the rate depends on the concentration of a reactant. The tutorial covers the mathematical equations involved, including instantaneous rate and integrated rate laws, and demonstrates how to calculate the rate constant. Graphical methods are used to analyze reaction data, confirming the order of reactions through straight-line plots.

Why is the time factor crucial in studying reaction rates?

• It affects the physical state of the products.

• It determines the color of the reactants.

• It is used to measure the temperature of the reaction.

• It helps in calculating the amount of reactant consumed.

In a first-order reaction, the rate of reaction is directly proportional to:

• The temperature of the reaction.

• The concentration of the reactant raised to the first power.

• The inverse of the product concentration.

• The square of the reactant concentration.

What is the purpose of integrating the rate equation in first-order reactions?

• To measure the pressure of the reaction.

• To calculate the concentration of reactants over time.

• To determine the final color of the product.

• To find the temperature at which the reaction occurs.

What does the slope of the line represent in a plot of natural logarithm of concentration versus time for a first-order reaction?

• The initial concentration of the reactant.

• The final concentration of the product.

• The temperature of the reaction.

• The rate constant of the reaction.

How can the rate constant be calculated from a graph of a first-order reaction?

• By finding the area under the curve.

• By calculating the slope of the line.

• By measuring the intercept of the line.

• By determining the color change of the reactant.

What does a downward curve in a concentration versus time graph indicate for a first-order reaction?

• The reaction is exothermic.

• The concentration of reactant is decreasing over time.

• The reaction is at equilibrium.

• The temperature is increasing.

Which equation form confirms that a reaction is first-order?

• E = mc^2

• PV = nRT

• F = ma

• Y = MX + C