Profesor de Química, Matemática y Física imparte clases particulares en Inglés

I am graduated in Chemistry with a Minor in Physics at the University of Lisbon, and I am currently in the Master in Theoretical Chemistry and Computational Modelling at Universitat de Barcelona.
The classes will be taken in English, even though I understand Spanish and know how to speak a bit.
The classes can also be online.
If there are any Portuguese students, I can have the classes in Portuguese or English, as prefered.