Most chemical engineering problems are either heavily math related or physics/physical chemistry related. You can ask your thermo/phy or any physics questions in the physical chemistry forum. As for the math questions, you can ask them also in the phy chem forum....we just don't have enough staff members of the physics/advanced math (calculus, diff. equations, lin algebra, multivariable) to handle the anticipated demand if such a math subforum were created, I would imagine.