Hardest parts of Chemistry & Biology?

[NiCKEL]

What did you feel we're the hardest parts of Chemistry and Biology, and why?

I have some spare time in first semester so I can actually prepare ahead a bit because I really want high scores in my sciences.

-pretty damn good but not godly memory

-not too mathy-going pretty well in SL math but wouldn't dare open an HL book

-didn't take either bio or chem at grade 11 level

-will be studying from the brand new syllabus

-both are HL

-hate ecology with a passion (I hope that's easy)

-pretty much nothing I hate from chemistry, although I still get some terms mixed up (mole/molecule/particle)

Thanks!

[Sandwich]

For me, remembering the mechanisms in Organic Chemistry because they all blur into one and memorising Photosynthesis/Respiration for Biology.

[rainbowunicorn]

Remembering all the different ways to calculate delta H in energetics... too many different delta H's too.. periodicity had a lot of memorization and that's one of my weaknesses. Plant science was hard because it was boring...

[IbTrojan]

For chemistry, personally it's not a specific unit but just figuring out when to use what formula, which theory...etc. when given a whole bunch of mixed up questions. But honestly, if you get the basics down, the questions that are difficult aren't too bad. 

As for biology, in my experience I'm not having trouble with any specific unit but just using the right terms in the right places (because of the new curriculum).