Reaction Rates (5.1)
The formula to find the rate for a reaction is usually considered to be...
Change in amount / change in time
What is the symbol for half life?
what does a Concentration vs time graph look like in the zero order?
Linear
In reactions involving multiple steps a catalyst and intermediate can be identified through a reaction...
1.) A catalyst will appear as a reactant in the rate determining step, but will not appear as a reactant or product in the overall reaction.
2.) An intermediate can be found when the reaction is occurring but does not end up as a product or reaction for the overall reaction.
A catalyst effects a reaction graph by...
Lowering the activation energy needed to start the reaction.
The 3 things that must happen for a reaction to occur according to collision theory is...
1.) Particles must collide.
2.) They must collide with the correct orientation.
3.) Must collide with energy greater than the activation energy.
What does it mean when the reverse reaction is equal to the forward reaction of a reaction equation?
The reaction has reached equilibrium.
What order must a natural log vs time graph be in order for the graph to be linear?
1st order
For the following overall reaction 2NO+ O2 --> 2NO2 which mechanism is the correct overall reaction?
Mech 1: (1)2NO --> N2O2 (2) N2O2 --> NO2 + O (3) NO + O --> NO2
Mech 2: (1) NO + O2 --> NO3 (2) NO3 + NO --> 2NO2
Mechanism 2
What shows an exothermic change in a reaction graph?
When the products energy level is less than the reactants energy level(Negative change).
The activation energy in a reaction is effected in what way when a catalyst is present?
it is decreased or lowered.
How do you know when the first step of a reaction equation is slow from a reaction graph?
It will have the largest energy hill on a reaction graph.
The type of graph need to get a second order reaction linear is?
A 1/Concentration vs time graph
What does a graph with a positive energy change represent? What does it mean when a dotted line is underneath the bold line?
1.) Endothermic change(Energy is absorbed).
2.) It represents the lower activation requirement due to a catalyst.
expose a larger surface area by turning the solid into a powder or some other way.
The max number of elementary steps you can have in a multi step reaction is...
There isn't a max number :)
For all three linear graphs in 0th, 1st, and 2nd order that have a linear relationship only one has the value of the slope equal to k. Which is it and what type of graph does it need to be linear?
A 2nd order reaction and it must be 1/Concentration vs time graph for it to have a linear relationship.
When does a reaction reach equilibrium?
How is a multistep reaction equation shown as a graph with an endothermic and exothermic change in the reaction?
One change represents a positive energy change and then the second change represents a negative energy change. Their should also be multiple bumps on the ground.