Hey as per my idea there are total 15 chapters in Ix CBSE Science and here I am giving you its details
Here I am giving you list of Ix CBSE Science chapters

Chapter 01 – Matter in Our Surroundings
Chapter 02 – Is Mattter Around us Pure
Chapter 03 – Atoms and Molecules
Chapter 04 – Structure of the Atom
Chapter 05 – The Fundamental Unit of Life
Chapter 06 – Tissues
Chapter 07 – Diversity in Living Organisms
Chapter 08 – Motion
Chapter 09 – Force and Laws of Motion
Chapter 10 – Gravitation
Chapter 11 – Word and Energy
Chapter 12 – Sound
Chapter 13 – Why Do We Fall Ill
Chapter 14 – Natural Resources
Chapter 15 – Improvement in Food Resources

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