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AP Chemistry 1.4 Chemical Reaction Rates 43 Views


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AP Chemistry 1.4 Chemical Reaction Rates. What are the correct units for a second order rate constant?

Language:
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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

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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