Units of Reaction Rate

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Jeremiah Samaniego 2C
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

Units of Reaction Rate

Postby Jeremiah Samaniego 2C » Thu Feb 22, 2018 4:25 pm

Are the units of concentration of reactant or product (i.e. mol / L) included when finding the reaction rate?

Tanaisha Italia 1B
Posts: 55
Joined: Fri Sep 29, 2017 7:04 am

Re: Units of Reaction Rate

Postby Tanaisha Italia 1B » Thu Feb 22, 2018 5:51 pm

Yes, because the rate is just a constant multiplied by the change in concentration over the change in time.
Concentration = mol/L
Rate = mol/(L* seconds)

Ramya Lakkaraju 1B
Posts: 67
Joined: Fri Sep 29, 2017 7:03 am

Re: Units of Reaction Rate

Postby Ramya Lakkaraju 1B » Mon Feb 26, 2018 3:32 pm

Yes, you should not ignore the units of anything when using equations because the units must make sense in the final answer.

Michelle Nguyen 2L
Posts: 50
Joined: Fri Sep 29, 2017 7:03 am

Re: Units of Reaction Rate

Postby Michelle Nguyen 2L » Mon Feb 26, 2018 4:28 pm

Yup; knowing that the rate has units (mol/L*s) tells you what units you should use for k, the rate constant. For example, the rate constant for a first order reaction has units (1/s) while the rate constant for a third order reaction Rate= k[A]^3 has units L^2/(mol^2 *s). ( [A] has units mol/L)

Adrian Lim 1G
Posts: 88
Joined: Fri Sep 29, 2017 7:03 am

Re: Units of Reaction Rate

Postby Adrian Lim 1G » Tue Feb 27, 2018 10:54 pm

Yes, you should have units to see which units you need for k. Also, it is wise to always make sure to include units; even if it isn't necessary, it's nice to double check certain terms and values.

Wayland Leung
Posts: 51
Joined: Sat Jul 22, 2017 3:00 am
Been upvoted: 1 time

Re: Units of Reaction Rate

Postby Wayland Leung » Tue Feb 27, 2018 11:27 pm

Are there any constants we need to use in this unit?

snehabhargava
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am

Re: Units of Reaction Rate

Postby snehabhargava » Wed Feb 28, 2018 9:26 pm

we do not need to know any constants for this test

Meredith Steinberg 2E
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: Units of Reaction Rate

Postby Meredith Steinberg 2E » Wed Feb 28, 2018 9:42 pm

We will use gas constant, R, when we talk more about activation energy and its relationship to k and A.


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