## equation derivations

$\frac{d[R]}{dt}=-k[R]; \ln [R]=-kt + \ln [R]_{0}; t_{\frac{1}{2}}=\frac{0.693}{k}$

Payton Kammerer 2B
Posts: 49
Joined: Tue May 01, 2018 3:00 am

### equation derivations

Are we ever going to be asked to replicate the derivation of an equation on an exam? Some of the derivations in this section were confusing, and if I can just memorize the equation I need and get full points, it would be really helpful for me.

Brian_Ho_2B
Posts: 221
Joined: Fri Aug 09, 2019 12:16 am

### Re: equation derivations

Although unlikely that something like that would appear on an exam, it is in fact a learning objective that you do know how to derive the integrated rate law equations and the half life equations. If you do need help with the math part of it, as you know there are math assistance resources on Prof. Lavelle's website. The specific method we use to derive the integrated rate laws is solving a basic differential equation with integration, and we use algebra to derive the half life equations (set [A] = 0.5[Ao] and solve for "t").

Christineg1G
Posts: 115
Joined: Fri Aug 09, 2019 12:15 am
Been upvoted: 1 time

### Re: equation derivations

I don't think that we will be asked to know how to derive the different equations given in this unit, but it is important and helpful to see the steps that it takes to get to a specific equation.

Luc Zelissen 1K
Posts: 57
Joined: Mon Jun 17, 2019 7:23 am

### Re: equation derivations

I wouldnt be surprised to see a derivation on the exam. Some of the UAs had a derivation problem on their second test last year. Also lavelle specifically went through the derivations in class, so we should probably know how to do it.

Tanmay Singhal 1H
Posts: 143
Joined: Sat Jul 20, 2019 12:16 am

### Re: equation derivations

there might be but the final is open book so.....

Alfred Barrion 2H
Posts: 100
Joined: Sat Jul 20, 2019 12:16 am

### Re: equation derivations

We wouldn't necessarily use the derivations on the exam, but knowing how the derivation occurs and how it leads to a specific equation would be valuable in decoding a certain question.

Posts: 50
Joined: Mon Jun 17, 2019 7:24 am

### Re: equation derivations

The derivations for integrated rate law will be useful to know, as well as the equations to find the rate constant or activation energy at different temperatures. We can just look in our notes for the last two lectures for the important derivations.

Brandi 2C
Posts: 52
Joined: Thu Feb 28, 2019 12:15 am

### Re: equation derivations

My TA told us that we should memorize the derivation for van't Hoff equation... He strongly suggested us to, so I am still not sure why would need to but I would follow his recommendation

ShravanPatel2B
Posts: 100
Joined: Fri Aug 30, 2019 12:18 am

### Re: equation derivations

Definitely understand how to derive the equations as it aids in understanding their function and just to visualize how the different components interact with each other. This can aid with conceptual questions as well as solving questions.

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

### Re: equation derivations

I know that on a previous test they were asked to derive Van't Hoff's equation! But it is always useful to understand derivations so you know how to apply the equation.