Topics-
Thermochemistry.
Why is it super advanced?
It involves physics, and anything physics related is hard pretty much.
Just take 10 minutes to make a poster about how changing the temperature will change the Work and the energy flown in or out of the system. Describe adiabetic (maybe that's how you spell it), isobaric (same pressure), isothermal (same temperature) and more processes will give either a work done on the system or work done by the system, a positive change in internal energy or a negative change in internal energy, and finally either a endothermic change in delta Q or an exothermic change in delta Q.
And since you wanted a hard subject, that's a pretty hard subject because it is highly conceptual and visual. Sometimes people define the work done by the system as negative, which means the work done on the system is positive, or some times people will define the work done by the system as positive and the work done on the system is negative. Choosing the first or the latter will also influence the outcome of delta Q and the internal energy.
