Kinetics Flashcards
What are the five ways of measuring rate of a chemical reaction?
Taking samples and titrating them Colourimetry Gas volume at a constant pressure Measurements of mass (if gas released) Gas pressure (at constant volume where number of moles of gas changes)
What is rate?
The measure of concentration per unit time
What is the definition of the order of a reaction ?
The index to which the concentration terms must be raised to to fit the rate equation
If Rate=k[A]^m [B]^n what is the order with respect to A?
m
If Rate=k[A]^m [B]^n what is the overall order?
m+n
If the reaction is zeroth order, what are the units for k?
moldm^-3 s^-1
If the reaction is first order, what are the units of k?
s^-1
If the reaction is second order, what are the units of k?
mol^-1 dm^3 s^-1
What are rate constants affected by?
Temperature
Catalyst
What are rate constants not affected by?
Changing conc of reactants
What is a mechanism?
The series of steps that happen during a chemical reaction
What step does the rate equation provide info about?
The rate determining step
What do the orders in the rate eqn correspond with?
The balancing numbers in the equation of the rate determining step
What does an increased temp do?
Increases Ek or particles
Increases collision frequency
Increases rate
Increases rate constant
What does adding a catalyst do?
Increases successful collisions
Increases rate
Increases rate constant
