4. Gay Lussac's Law of Combining Gas Volumes 5. Avogadro's Law. Need help in Chemistry? Are you in 11th or 12th grade? Then you shall find these videos useful. Barring 10 videos on "IUPAC Nomenclature" and 8 videos on "Comparing acid base strengths of organic acids", which I made as they were requested by students. I have uploaded videos following the chapters of the NCERT Text book for Class 11 to be followed by class 12. I am making the videos in sequence so You can play the videos from the beginning to do the entire course. I hope you work with your teachers and me and 'kill it' in the final exams - Boards in India or Regents in the USA.. Wishing you all the best!! HAPPY STUDYING!! If you have questions regarding the video, please do write in the comments. I will get back to you as soon as possible.