Flashcards in 17 - 4 Deck (19):
What is rxn rate?
How fast a reaction happens
How is rxn rate measured?
TRIANGLE [reactant]/unit time
How can rxn rate be determined?
What is one thing rxn rate determines?
How fast a cake bakes
What influences rxn rate?
Nature of the reactions & surface area, T, [. ], & catalyst
Define nature of the reactants
Ionic(reacts instantly) or covalent (May take hours)
Describe what happens when T increases
Increased T will increase KE which will increase the # of particles with enough energy to "go" WRT E-act
Describe what happens when [ ] increases
Will increase KE cuz there are more particles preset to collide
Substances that increase the rate of a rxn without being involved in rxn
How do catalysts work?
By decreasing e-Act
When will a catalyst be homogenous?
WRT reactants (of the same phase)
When will catalysts be heterogeneous?
WRT reactants (different phases)
What's the opposite of a catalyst?
What is an inhibitor also known as?
Stops or slows a rxn by forming stable, nonreactive intermediate species w/ reactants, keeping to busy to react
Define rate laws
Mathematical expressions that relate the rate of a rxn to the [ ]'s of thee reactants
How do you write a rate law?
1.) Keep [ ] of reactants constant & time it
2.) vary the [ ] of one & time it again
3.) vary the [ ] of the other & time it again
When is rxn rate 1st order?