First Order Reaction Concepts

The video tutorial explains first order reactions, focusing on the rate law and integrated rate law. It demonstrates how to graph the natural log of concentration versus time to obtain a straight line, where the slope is the negative rate constant. The tutorial applies these concepts to the conversion of methyl isonitrile to acetonitrile, using pressure data instead of concentration. By graphing the natural log of pressure against time, the video shows how to confirm the reaction is first order and calculate the rate constant.

What is the rate law expression for a first order reaction with respect to reactant A?

• Rate = k[A]^-1

• Rate = k[A]^0

• Rate = k[A]

• Rate = k[A]^2

How is the integrated rate law for a first order reaction graphically represented?

• As a hyperbola

• As a parabola

• As an exponential curve

• As a straight line

In the context of the conversion of methyl isonitrile to acetonitrile, why is pressure used instead of concentration?

• Pressure is unrelated to concentration

• Concentration is more accurate

• Pressure is easier to measure for gases

• Pressure is only used for liquids

According to the ideal gas law, how is pressure related to concentration?

• Pressure is equal to concentration

• Pressure is unrelated to concentration

• Pressure is inversely proportional to concentration

• Pressure is directly proportional to concentration

What is the significance of the slope in the graph of the natural log of pressure versus time for a first order reaction?

• It represents the initial concentration

• It is equal to the rate constant

• It is equal to the negative rate constant

• It represents the final concentration

What is the unit of the rate constant k for a first order reaction?

• Molarity per second

• Seconds

• Molarity

• Inverse seconds

What does a straight line in the graph of the natural log of pressure versus time indicate about the reaction order?

• The reaction is first order

• The reaction is second order

• The reaction is third order

• The reaction is zero order

What happens to the pressure of methyl isonitrile as time increases during the reaction?

• It increases

• It remains constant

• It fluctuates

• It decreases

What is the relationship between the natural log of the initial pressure and the y-intercept in the graph?

• The y-intercept is twice the natural log of the initial pressure

• They are unrelated

• The y-intercept is the natural log of the initial pressure

• The y-intercept is half the natural log of the initial pressure

How can the rate constant k be determined from the graph of a first order reaction?

• By finding the y-intercept

• By taking the negative of the slope

• By measuring the height of the graph

• By calculating the area under the curve