<https://es.coursera.org/learn/basic-chemistry#mooc>
<http://schema.org/Description>
"This is an introductory course for students with limited background in chemistry; basic concepts such as atomic and molecular structure, solutions, phases of matter, and quantitative problem solving will be emphasized with the goal of preparing students for further study in chemistry."
<https://es.coursera.org/lecture/basic-chemistry/simple-structure-formal-charge-and-resonance-part-i-bPSdP?authMode=signup>