5.1 Calculate enthalpy change for a reaction using experimental data (mcdeltaT) [SL IB Chemistry]

5.2.3 Calculate the enthalpy change for a reaction using experimental data on temperature changes, quantities of reactants and mass of water. Burning a known mass of fuel and causing a known mass of water to be heated by a certain amount will allow you to calculate delta H using

delta H = -m c deltaT

Where m = mass of what is heated
c=specific heat capacity of what is heated
delta T = temperature change of what is heated.

Dr Atkinson has been warned to never EVER play around near calorimeters again!

[itsnothinggoaway]

Annd thanks to you I'm gonna pass my year 12 chemistry exams. You sir are a top bloke.

[soniya]

I've got a Chemistry quiz tomorrow and you just saved my life! Thank you so much! 

[soumyasharma]

Mr. Thornley I was just wondering, ΔH=0.102*4.18*19.7= -8.39kJ. Not, 8.34kJ. Hence, (0.02/-8.39)=(1/x) solving this eqn gives, x=-419.5 kJ .

[hikaru-senpai]

Thank you so much for these they make chemistry so much easier and fun!!!!

[jonahbeaudin]

Hey Mr. Thornley, that Teletubby joke had me cracking up! Hahahah
Keep up the good work

[baderffs]

creative way of making your points whilst playing gmod 🖒

Haha thanks! These are way better than what I've learned in class. Your speed and clarity is awesome :-D

[ibchemvids]

yuk, energy cycles - i did a bit of a video on it already 5.3.1 i think.

[ckyborg]

@RichardThornley You are a saint among men! Thanks for saving me!

[lhadontense]

where the hell did that 0.60 gm come from?? :(

[ibchemvids]

to remind you that it is exothermic (energy released) and works with delta H.
Do not use it if you think it is clearer as "q" - which is just energy and has no negative

[purAquaa]

omg - you've used Gmod to explain chemistry, brilliant. :)

[missrosieee]

hey, love your videos! just a quick request (i know you don't have much time) could you possibly go over energy cycles? >.<

[Crazy-ylxt]

can you please tell me the name of the game if it is a game or the name of the thing you use?

[ibchemvids]

@TWolfKaden I inflict them on them in class sometimes - and some watch them at home in preparation tests.

[MuhabHasan]

can u please explain to me why when energy lost to the surroundings the enthalpy change (experimental) is lower not higher? although we supposedly must get gr8er difference in mass of methanol to get the same change in temperature which causes gr8er enthalpy change

[ibchemvids]

p9 in my data booklet (but the IB have 2 versions for this course)

[hyperhan]

I was doing a past paper 1 and I got this question wrong and i'm not quite sure why.. here's the question:


I. The mass of magnesium
II. The mass of the water
III.
A. I and II only
B. I and III only
C. II and III only
D. I, II and III

I thought the answer would be C, seeing that you're only heating the water therefore you would need the mass and temp change of water, and not the  mass of magnesium, but the markscheme said the answer was D. Why would you need the mass of magnesium if you're not heating it up? where would it fit in the 
q =MCdeltaT formula? 

Thanks again for these videos!

[inez]

where did you get the -726 for theoretical value around 9.11?

[joobalu]

So what does the unit 'mol to the minus one' actually mean? Clearly, it means 'per mol', but per mol of what exactly?