These videos are a life saver! Is there any possibility of you making more of these revision videos for each chapter in the future? It would be so helpful
Heyyy, thank you so much for making these revision videos. Can you also make these revision videos for Topics 3/13, 4/14, 6/16, 7/17, 8/18, 9/19 and 10/20? I am a Chemistry HL student (writing M23) and these videos would greatly help me. Thank you and appreciate all your efforts
For question "4b" the relative atomic mass shouldn't be in g/mol because it's relative to a carbon-12 atom. This is because the atomic mass of a carbon-12 atom is approximately (very close) to 12amu (amu = 1.66*10^-27kg), this means that the mass of 1/12 of a carbon-12 atom is almost exactly 1amu, hence it is used (previously hydrogen-1 was used but it is slightly greater than 1amu so they changed it). Essentially, the molar mass is derived from relative atomic mass, but for example, an oxygen-16 atom has an Ar of 16.00, which means it's 16.00u relative to the mass of 1/12 of a carbon-12 atom that we now know to be 1amu, so it's 16.00u/12.00u and units cancel out and it's written as just 16.00 (I don't know the details why but it does form the basis of molar mass since 1mol = 6.02*10^23 atoms multiplied by 1amu is actually equal to 1, so that's why the relative atomic mass and molar mass are the same numbers).
I'm not making these at the moment but I'm going to be running online workshops soon if you want ti sign up to my email list forms.gle/jK3MboiyLAc2VYuQA
I don't know about iit jee! I'm working on the new IB Chemistry syllabus at the moment but maybe after that! Hopefully there will be lots of overlap :)
Hi Tanvi :) This is a great question! When we observe the emission spectrum of an element using a spectroscope we see that the lines get closer together at higher energy (towards the blue end of the visible emission spectrum). We constructed the model of the energy levels from what we observe in the emission spectra so we're able to deduce that the energy levels must be converging at higher energy. So there's not really a reason "why"... it's more that we made the model based on what we see in the emission spec (but it's probably to do with stability of electrons in certain regions of space - definitely not covered until university level chem!)
