Question

# 5 Describe the variational principle. Explain how itprovidesthe foundation for most modern quantum mechanicalcalculations ofchemical importantce. How is it that advances incomputer memory andprocessor speeds have made it possible to getuseful approximatesolutions to system big enough to be of interestin Chemistry?

Note: this question was in the exam with 10 points and Ididnot get any single point on it. So, I would like thecramstercommunity to try and let me know because it maybe show uponceagain in final exam, or just for my own knowledge.