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Description:
AP Chemistry 1.4 Chemical Reaction Rates. What are the correct units for a second order rate constant?
Transcript
- 00:00
Thank you We sneak and here's your shmoop du jour
- 00:05
Brought to you by units No not your great aunt
- 00:08
eunice units man your hearing's getting as bad as your
- 00:12
aunt units if rate is measured in mole's per liter
- 00:15
per second concentration is measured in miles per leader What
Full Transcript
- 00:19
is the correct units for a second order rate Constant
- 00:22
and your potential answers All right You know i get
- 00:24
asked that a lot of cocktail parties Okay well this
- 00:27
problems asking about the units for a rape constant but
- 00:29
there's a catch It doesn't give us the equation for
- 00:32
the rate law told so let's start by writing the
- 00:36
reaction rate law equation right there Rika rate law tells
- 00:40
us the reaction rate as a function of the rate
- 00:42
constant in the concentration of the reactant way don't know
- 00:46
what the reactant are but we do know that the
- 00:48
reaction is second order it's hoping to make the order
- 00:52
of the phoenix by the end of the year But
- 00:54
you don't have to put in it's time for us
- 00:56
Okay so the reaction order refers to the exponents on
- 00:58
the concentrations of the reacting species in the rate law
- 01:02
If we have only one reactant a then the concentration
- 01:06
of a must be squared in this equation Well the
- 01:08
question asked us to find the units on the rape
- 01:11
constant k Unfortunately we're given the units for the other
- 01:14
terms in the equation Good thing we wore our lucky
- 01:17
underwear today All right so here's the trick Since the
- 01:20
concentration of a is squared the units on a mole's
- 01:23
per leader are also squared After that all we have
- 01:27
to do to find the units on k is a
- 01:29
little math We have to isolate the unknown then group
- 01:34
the same units together and cancel out terms by term
- 01:39
correct units for the rate constant our leaders per mall
- 01:42
for second which is answer c Now how would you
- 01:46
rate that constant We'd give it five girl and meyer 00:01:48.966 --> [endTime] flasks
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