This chapter explains the concepts of chemical changes and chemical reactions as per the Class 9 ICSE Chemistry syllabus. Students learn how new substances are formed through chemical reactions and understand the signs, types, and representation of chemical changes. The chapter includes important concepts, equations, and examples related to chemical reactions.Key Topics:• Physical and chemical changes• Chemical reactions and equations• Types of chemical reactions• Signs of chemical change• Reactants and products• ICSE Chemistry examples and concepts