About RG and Journals, do you know a list of Journals for which Rg gives the IF scores?

I can not find it.

You can find the Impact Factor of a Journal through RG by typing "Researchgate" followed by the name of the Journal

for instance the result of typing "Researchgate Journal of hydrology"

is here

https://www.researchgate.net/journal/0022-1694_Journal_of_Hydrology

IF seems calculated the same way than in Webof Knowledge or Scopus .