Chapter 5 Chemical Kinetics Flashcards
What is First order rxn?
Rxn depends on concentration of 1 reactant
What is 2nd order rxn?
Rxn depends on concentration of either one reactant squared
or
2 separate reactants
Do reactants, products or transition states have higher energy?
Transition States have highest energy
Do stoichiometric coefficients match the order of the rxn?
Only in 2 cases:
1. When rxn mech. is a single step and balanced rxn reflects the entire chemical process.
2. When all of rxn mech. is given and rate-determining step is indicated.
Difference between equilibrium constant and rate law?
Equilibrium constant includes products, rate law is only reactants.
What is a zero order rxn?
Rate formation of the product is independent of changes in concentration
What is the rate-determining step?
slowest step, limits the maximum rate
What is collision theory?
a reaction rate is proportional to the number of effective collisions
between the reacting molecules.
*Arrhenius equation is a mathematical way of representing collision theory
Can transition state move back or forward?
Yes, the reaction can proceed toward products or revert back to reactants
Why does increasing concentration of reactants increase reaction rate?
because there are more effective collisions per time.
How are reaction rates measured?
In terms of the rate of disappearance of a reactant or appearance of a
product.
What is the rate order?
The sum of all individual rate orders in the rate law.
How can zero order rxns be affected?
by changing the temperature or adding a
catalyst.
*time curve is a straight line
What are broken order rxns?
those with noninteger orders.
What are mixed-order rxns?
those that have a rate order that changes over time
