Free PDF download of Class 7 Science Chapter 6 - Physical and Chemical Changes Revision Notes & Short Key-notes prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Register Online for Class 7 Science tuition on CoolGyan.Org to score more marks in CBSE board examination. Download NCERT Solutions PDF and opt to cross-refer post-answering questions to score subject-best marks.  You can also download NCERT Solutions for Class 7 Maths to help you to revise complete syllabus and score more marks in your examinations.