Terms
The type of relationship between temperature and speed/energy.
Direct
What is the slope line formula of Zero Order equation?
-k
Solve for the rate constant when both molarities are .25 and the rate is 1.43x10-6:
Rate = k [NO]2 [Cl2]1
k = 9.152x10-5
As a general rule, chemists always look at what?
Of the reactants, and not the products
Disappearance
Find the Order:
Rate = k[A]1
First Order
Two factors that effect reaction rate.
Temperature, Concentration, Pressure, and Surface Area
What is the instant rate equation for First Order?
Rate = k[A]1
Solve for the rate when the Molarity of Mg is .49:
Rate = .49[Mg]0
Rate = .49
Concentration in what?
Is always used in rate equations.
Molarity
Find the Order:
[A]t=-kt+[A]i
Zero Order
What unit is concentration measured in?
Molarity
Write the basic “instant rate” equation
K(A)x (A)y
What is the half-life of first order Cu when k=3?
t1/2=.693/k
t1/2=.231
What does Rate constant indirectly tell us?
How rapid or slow a reaction will proceed
Find the Order:
Rate = [N]2[H]1[Fe]2
Fifth Order
True or False: When ‘k’ is a large number, the reaction is slow.
False
[A]t = -kt + [A]i
What is the order for this equation?
Zero Order
What is the rate constant of first order oxygen when the initial Molarity is .3, the end Molarity is .2, and the time is 10 minutes?
ln[O]t=-kt + ln[O]i
k = .041
In a rate equation, also known as the rate order, what has to be determined by looking at various experiments?
The exponent
Find the Order:
Rate = [Mg]0[B]2
Second Order
What does a “Catalyst” do in kinetics ?
It increases the rate of a reaction, because set the reactant molecules have more kinetic energy, move faster, and collide more often with greater energy.
Write the zero, first order, and second order integrated rate equations:
Zero Order: [A] = [A]0 - k t
First Order: [A] = [A]0 e-k t
Second Order: [A] = [A]0/1 +k t [A]0
SURPRISE! Balance the Chemical Equation:
__C6H2 + __ O2 —> __ H2O + __ CO2
2, 13 —> 2, 12
The method of figuring out the exponent in a rate equation by comparing experimental data is called what?
Method of initial rates
Find the Order:
Rate = [Cl]2[Li]2
Fourth Order