For Class 6 to 12 CBSE Students
CBSE Learning
Made Simple.
Score Higher.
Notes, quizzes, tests & worksheets designed to help you understand better and score higher in less time.
MKKCLASS
Welcome back, Student! 👋
Let's continue your learning journey.
Your Progress
78%
Keep going! You're doing great. 🚀
Weekly Streak
12
Days
Amazing! 🔥
Continue Learning
Science
The Fundamental Unit of Life
Chapter 5 • Class 9 Science
60% Completed
Explore Subjects
View All SubjectsAll-in-One Study Platform
Everything you need to study smarter, not harder.
MKKClass brings all the study tools together so you can focus on what matters – understanding and scoring higher.
Chapter-wise Notes
Worksheets with Solutions
Quizzes & Chapter Tests
Previous Year Questions
Flashcards for Quick Revision
Mock Tests & Sample Papers
Chemical Reactions
Key Concepts
• A chemical reaction involves breaking and forming of bonds
• Reactants are converted into products
• Law of conservation of mass applies
H₂ + Cl₂
→
2HCl
Important Points