HChem Chemical Kinetics Test Flashcards
The enthalpy change is the _____ of the reaction and is found by ____________
Heat
Products-reactants
The activation energy=
Activated complex-reactants
Enthalpy changed and activation energy have what unit?
In
The strongest bonds are where the _____ energy is greatest
Kinetic (potential energy is weakest)
The weakest bonds are where the ____ energy is strongest
Potential (kinetic is weakest)
Why are bonds with greater potential energy weaker
They are closer to the activated complex and it takes less force to break the bonds
As reactant molecules approach each other, they exert ________ forces on each other. Thus, as they move together, their speed ___________ and their potential energy __________
Repulsive, goes down, goes up
What is the activated complex
The intermediate created at the peak of the reaction
What is the activation energy
The energy required to break the bonds/ minimum quantity of energy that the reacting species must possess in order to undergo a reaction
What two requirements must be met before a collision between two reactant particles is effective
Must collide with high energy (greater of equal than Ea)
Must hit each other with the correct orientation
A slow reaction would start with a ______ PE
High
The activated complex of a step is represented by the ____ while the intermediate is represented by the __________
Peak, valley at the bottom
Would you expect a reaction with 5 particles to take place in one step
No- they won’t collide at the right speed and orientation the first try
Adding a catalyst to any step but the RDS will/will not affect the reaction rate
Will not
If a catalyst is discovered that increases the rate of the RDS, how will the overall reaction be affected
It will increase
