15.2/R1.4.2 Explain how Temperature Changes Delta G [HL IB Chemistry]

15.4.3 Predict the effect of a change in temperature on the spontaneity of a reaction using standard entropy and enthalpy changes and the equation of delta G.
The universe likes hot and messy reaction, but cold and tidy reactions never happen. Hot and tidy OR cold and messy are temperature dependent.
Note: Dr Atkinson is killed in hell and revived in endo land -- but you gotta look closely.

[@emsaa3148]

I just wanna thank you so much for making these videos! They have honestly helped me a lot through my first (and first half of the second) year of IB HL chemistry. Thank you!

[@meilekeck]

thank you so much. you seriously saved me. so helpful!

[@TheMcallist1]

Amazing video. Thanks a mill

[@MrArdyHardy]

Thank you so much!

[@leapedcypress]

thanks man ur rlly amazing (y)

[@rhiwebb12]

Hi, thanks so much for these videos, biggest lifesaver!
My text book says that:
at low temp - deltaG =(approx) deltaHsys
at high temp - deltaG =(approx) -TdeltaSsys
is this correct, and should I be using these formulas? or should I always use the original one?
Thanks

[@SinaGT95]

Why does delta G decrease in the first example as temperature rises, but increase in the second example as temperature rises?

[@ibchemvids]

Try putting actual numbers into the equation, but simple ones such as +1, -2 etc

[@beijingwab]

how do you find the values when the delta G is zero at (2:31)

[@samho2137]

Sir, may i know do the temperature have any effect on the value of delta H and delta S, I m confused on the effect of temperature on delta G🙏

[@ibchemvids]

Thanks to "teermana" for spotting an error in the previous version.

[@shereenbatra3317]

Mr. Thornley, at 02:38 does the reaction always start at 840K with regards to Gibbs free energy and spontaneity or was this specific for this reaction? P.S. sorry if its a stupid questionn

[@ibchemvids]

specific to the question - you are not stupid - I struggle with these sometimes!

[@bassamtungekar5826]

How did you find out delta h by just looking at the equation?

[@ibchemvids]

The IB expects you to know that combustion, neutralization and bond making is exothermic delta H = -

[@domagojmarjanovic8824]

so if the reaction is cold and tidy (non-spontaneous) it won't happen at all?

[@ibchemvids]

this is my understanding - even changing T will not make it "happen"

[@marianokal8767]

What causes such a reaction to happen? It surely has to be possible to happen under some very specific conditions. I can't find an explanation for this anywhere.

[@ibchemvids]

delta G = deltaH - T delta S
When delta G =0 the the reaction is just about to start (or stop!).
We would then have to give you 2 of the variables and you would need to find the 3rd.

[@ibchemvids]

looks correct to me, but I still prefer the actual equation.

[@uinet1970]

hot and messi