Reaction rate
Collision theory
Rate expression
Reaction mechanism
Activation energy
100
With the presence of a catalyst, the rate of reaction will
increase
100
the minimum energy that particles colliding must have in order to produce successful reaction
What is activation energy
100
Fill in the blank:
The rate of reaction will _______ over time.
decrease
100
Why would the concentration of a reactant not be included in the rate equation?
It is zero order or not part of the rate determining step
100
the sign of the enthalpy change in an endothermic reaction is
positive
200
Catalyst will increase the rate of reaction by
lowering the activation energy
(by providing alternate pathway)
200
In order to a reaction to happen, the molecules must have these
activation energy and right orientation
200
deduce the rate expression for a single step reaction
2A + B --> 3C
R = k[A]^2[B]
200
What can cause the rate constant to increase or decrease?
A change in temperature
200
the y-axis of Maxwell-Boltzmann curve is
number of the particles
300
the decrease in concentration of the reactants per unit time or the increase in concentration of the products per unit time.
what is rate of reaction
300
Decrease in the factor will increase the rate of reaction
Particle size
(surface area)
300
what is the overall order of reaction of the reaction:
3A + 2B + C --> 4D
assuming it is a single step reaction
6
300
How can an intermediate be recognized in a reaction mechanism?
It is present in the product of one step and the reactants of the next step.
300
What does the frequency factor show in the Arrhenius equation?
Probability of particles having the correct orientation and energy to successfully collide.
400
If a reaction happens in four steps, the rate determining step is the
slowest step
400
Increase in these two factors will increase the rate of reaction
Temperature and concentration
400
If the rate of reaction of 0th order reaction is plotted against time, the graph will be
straight flat line
400
- Two species, P and Q, react together according to the following equation.P + Q → R
The accepted mechanism for this reaction is
P + P --> P2 fast
P2 + Q → R + P slow
What is the rate law?
rate = k (P)^2 Q
400
When lnK vs 1/T (K) is plotted on a graph how is Ea found?
slope = -Ea/R
500
Appropriate units for the rate of reaction
mol dm^-3 sec^-1
500
What order is the following reactant?
First or second order
500
The half life of substance A is 1 year. If substance B, which has half life of 2 times shorter than substance A, is left for 2 years, how much of its initial mass will be leftover?
1/16
500
How does increasing the surface area of a reactant change activation energy and rate of reaction
No change in activation energy, rate increases
500
In order to calculate the activation energy, you need to know
rate constant temperature