Rate Basics
What is rate?
The change in concentration divided by time
What happens to concentration in the zeroth order?
In this order reaction, increasing concentration has NO effect on rate.
The general rate law format for two reactants A and B.
rate = k[A]^x[B]^y
The integrated equation for a first-order reaction is:
ln[A]t = -kt + ln[A]₀
For the reaction A → products
Exp [A] (M)Rate (M/s)
1 0.10 0.020
2 0.20 0.040
What is the order with respect to A?
First order
What is molarity (mol/L)?
The units used for concentration in rate equations.
What happens to rate and concentration in first order?
If doubling concentration doubles the rate
How can rate laws be determined
Only experimentally
The half-life equation for first order reactions is?
t½ = ln2 / k
A first-order reaction has k = 0.173 s⁻¹.
How long does it take for concentration to drop from 1.00 M to 0.125 M?
The negative sign belongs to which side of the chemical equations?
The left side which is reactants
What happens to concentration and rate during second order?
If doubling concentration quadruples the rate
If rate = k[A]²[B], the overall order of reaction is:
third order
The integrated equation for a second-order reaction is...
1/[A]t = kt + 1/[A]₀
How do you spell my name?
Xileme
What are the units for time in kinetic problems?
Seconds
If concentration triples and rate increases by 9 times, the order is:
second order
If a reaction is first order, the units of k are:
s⁻¹
In a zeroth-order reaction, half-life becomes shorter as what increases?
time
What's the name of UTEP's president?
Heather Wilson
When you see a reaction written like this:
aA + bB → cC + dD
The letters a, b, c, d are called...
stoichiometric coefficients.
For a second-order reaction, the units of k are:
M⁻¹·s⁻¹
If a zeroth order reaction has rate = 0.25 M/s, the units of k are:
M/s
A first-order reaction has a half-life of 8 minutes. How long will it take to be 87.5% complete?
24 minutes
A first-order reaction has a half-life of 8 minutes. How long will it take to be 87.5% complete?
24 minutes