Thanks for saving my grades good sir. I swear Khan academy and other "famous channels" are so overrated. Best online tutoring video, with the zombies and all. Amazing.

@ibchemvids

8 жыл бұрын

+Vatsalya Saini I have actually taught chemistry to students for years - this helps!

@nasirsalvatore2184

3 жыл бұрын

pro trick : you can watch series at Flixzone. I've been using them for watching loads of movies these days.

@soreneddie9301

3 жыл бұрын

@Nasir Salvatore yup, have been watching on flixzone for months myself :)

can i hire u on behalf of my school lol

i have to say that this video was tremendously helpful. i agree, rate equations are just one of those things you have to just know. anyways i have my paper 1 and 2 tomorrow and this video really helped. perhaps ill see one of those equations tomorrow. thank you for all your hard work, you're a great teacher, please continue to make these for the benefit of kids around the world

Your videos are the best I've seen so far. Thanks a lot!!! Hope you'll complete all of the sections. Cheers!

Hello! Thank you so much for all the videos. You are the best youtube teacher for ib chemistry! I also suggested you to my friends :)))

LOL ''IDK HOW TO TEACH THIS'' but u did teach me!! my teacher knows or at least he think he knows and I never understood! So thank you :) 5 days away from exams ugh! Thanks again I wouldn't be able to find a better way to revise. I love you Mr.Thornley!

Nice work Mr T.

This helped me so much

soooo helpful thanks

at 4:20, couldn't the second example work? What if we found experimentally that the coefficient for [B] is 0 and 2 for [A]?

For the medium example, rate=k[A][A] was simplified to rate=k[A]^2. Does that then make A second order?

Thankkkkkkkkkkkkkkkkkkkkk you !!!

But the syllabus says "Only examples with one- or two-step reactions where the mechanism is GIVEN will be assessed." So we don't need to come up with the mechanisms?

You can never assume that the coefficients are the exponents - but they may end up as them. eg If the reaction mechanism is only one step

yup

@Richard Thornley Is this correct: A + B -> AB AB + C -> ABC A + B + C -> ABC

Will the following mechanism also work? 2N2O -> 2NO + N2 2NO + N2 -> 2N2 + O2 Where the first step is the rate determining step?

Love your videos!Just wondering, the part with the zombies and the station... is that a video game? Where is that from?

@ibchemvids

10 жыл бұрын

Garrys Mod

They have asked in the recent past for mechanisms.

for the 2-step mechanisms you wrote (with N2O -> N2 + O / N2O + O -> N2 + O2), I thought oxygen is diatomic so it should always come in pairs?

The o2 has to break at some stage to make a new molecule. Monatomic oxygen is very unstable and reactive - so this is a very short lived specie.

What software do you use for the demonstrations?

For the final problem, couldn't the second step also be the RDS??? Kind Regards

Hello Mr. Thornley. I just have a quick question (video was very helpful by the way). I understand that when writing the rate expression, you have to make sure the concentrations used in the expression have to be of reactants in the overall equation, but what if the first step is the rds with a two reactants, one as a catalyst and the other as a reactant in the final equation? Do you write the expression using the concentration of the catalyst even though it isn't in the overall equation? Hope this question makes sense haha thanks either way!

@ibchemvids

7 жыл бұрын

Sometimes the catalyst is in the rate equation (the IB asked a question on that once). So only the reactants can appear in the rate equation, and a catalyst is considered a reaction.

@joshhayden1706

7 жыл бұрын

Richard Thornley Awesome, thanks so much!

@ibchemvids

7 жыл бұрын

then i think rate=k[catalyst][reactant] . Even though the catalyst gets "cancelled out" in the equation it appears in the rate equation. The IB have only asked this once and we were all surprised !

Hello Sir! I did the devilish nitrogen question myself and got the two-step mechanism: N2O --> NO + 0.5N2 NO + N2O --> 1.5N2 + O2 (R.D.S) Can this be a possible answer as well?

Are all the orders you are putting assumptions? Because if we experimentally determined the order and came out different. I'll just tell my students to assume the order since the objective here is different.

@ibchemvids

2 жыл бұрын

My recollection is that the orders are assumptions. If you use different conditions the orders may also change.

so if its the rate determining step, the coefficients become the exponents?

@ibchemvids

10 жыл бұрын

yup

Would this one work for the evil one? N2O+ N2O --> N2+ 2NO(rds) NO + NO --> N2 + O2

@khaledyasser8293

5 жыл бұрын

5 years late by N2 doesn't cancel out

RDS= the step with the highest energy transition state! Not the step with the highest activation energy (Ea)

@anbudamodaran4162

2 жыл бұрын

Well...

Do you have any methods to let students contact you? (ex: email)

@ibchemvids

3 жыл бұрын

email is in the about section

why do you assume that the reactants are always of first order in the rate equation

i used to understand very little,coz most of time I end up wondering

Activstudio on an Activboard (plus Garrys mod)

:)

"evil" hahaha

u lost me at 3:11

:)