Recent content by weng cheong

i understand that methylation helps to differentiate between parental strand and daughter strand with mismatch nucleotides. (newly synthesised DNA is hemimethylated) then GATC endonuclease and GATC exonuclease will nick the mismatch nucleotide sequences. however, i don't understand how the...

where do hydrogen ion(Bohr effect) and 2,3 BPG bind to? porphyrin or just the globin chains?

zwitterion is defined as is a neutral molecule with a positive and a negative electrical charge (n.b. not dipoles) at different locations within that molecule. while isoelectric point means pH at which a particular molecule or surface carries no net electrical charge. does it mean...

what is the general structure of ganglioside? and what are the differences between GM1, GM2 and GM3?

alright, then H=U+PV. we know that U is state function while PV is a path function. then how can the sum making H a state function?

I like Serena does it mean that work done is a path function, because for the same value of work done, the might be a lot of combination of pressure and volume values? Timthereaper then why are you saying that PV(the work done) is a state function?

yes they are, but then why isn't work done a state function?

however i read a text saying that, 'delta H has a defined value for a particular change, regardless of whether or not it's at constant pressure'. in this case, W is not a state function. then how is it possible?

it was stated on a cambridge notes that, H is a state function. though H depends on U, which is a state function, however P and V also affect the value of H, how can H be a state function?

i think now i have a better understanding. Thank you =)

but in my textbook, in defining the change in entropy of surrounding, d Ssurr= Qsurr/Tsurr = Qreversible/Tsurr so what i don't understand is that, why it equates Qsurr to Qreversible, in which the transfer of heat is impossible to be reversible? and i can't figure out why it...

Studiot, or would you please answer my another question? for reversible heat transfer heat transfer, infinitesimal temperature difference is required. when the system and surrounding are at the same temperature, there will be no problem. what if at the beginning of process the system and the...

does the identity of molecules affect the internal energy, besides the temperature and volume?

let's say heat change between system and surrounding, so the process must occur in infinitesimal steps ie, infinitesimal temperatures here. my problem is, how can we causes that to happen this way? i found some sources saying that, this is due to the large size of the surrounding. How are they...

Andrew Mason, thanks for clearing my doubt, i wish to continue the discussion here. 1) dQ = dU - dW' i agree that to enable the reversibility, W' has to be maximum. is there any restriction to the values of dQ and dU? what if the dQ is too small to cause a difference in T, then dU=0, dQ=dW'...