CBSE Class 9 Science — Atomic Foundations of Matter
Chapter 9 of the CBSE Class 9 Science syllabus. About 97 minutes of teaching.
Unit: Matter - Its Nature and Behaviour
Unit weightage: 25 marks
7 topics
What is in this chapter
- 1Law of Conservation of Mass foundation12 min
- 2Law of Constant Proportion12 min
- 3Dalton's Atomic Theory12 min
- 4Molecules of Elements and Compounds14 min
- 5Ions and Ionic Compounds14 min
- 6Writing Chemical Formulae foundation18 min
- 7Molecular Mass and Formula Unit Mass15 min
What to know first
This chapter builds on Journey Inside the Atom. If any of those feel shaky, start there — the concepts below assume them.
Where the marks are
CBSE publishes marks by unit, not by chapter. The Matter - Its Nature and Behaviour unit carries 25 of the 80 marks in the paper, across 3 chapters. Our estimate for this chapter alone is about 9 marks — useful for deciding what to study first, but it is our split of the unit, not an official CBSE per-chapter figure.
This chapter is not on the board yet.
We author chapters one at a time and only publish once the lesson has been checked end to end, so we would rather say "not yet" than ship a thin one. The syllabus above is accurate and free to use meanwhile.
Other chapters in Class 9 Science
Cell: The Building Block of LifeTissues in ActionDescribing Motion Around UsExploring Mixtures and their SeparationHow Forces Affect MotionWork, Energy, and Simple MachinesJourney Inside the AtomSound Waves: Characteristics and ApplicationsReproduction: How Life ContinuesPatterns in Life: Diversity and ClassificationEarth as a System: Energy, Matter, and Life