Class 10 Science Chapter 1:
Chemical Reactions & Equations
Super Detailed Notes – Donkey Can Master It!
(Every tiny detail explained like a story. 100% Exam Ready. No confusion!)
📍 1. Chapter Map / What You'll
Learn
Chemical Reaction Basics
Writing & Balancing Equations
5 Types of Reactions (Detailed Examples)
Redox Reactions Deep Dive
Corrosion & Rancidity (Prevention Tricks)
Important Experiments
Exam Questions Solved
🧪 2. Chemical Reaction – The Magic
Change
Real Meaning: When substances chemically combine to form entirely new
substances with new properties.
, Everyday Example: Grass (you eat ) + Stomach acid → Poop + Energy
(Totally new substances!)
4 Clear Signs (Proof a Reaction Happened)
🎨 Colour Change: Apple slice turns brown (Enzymes react with oxygen).
🫧 Gas Evolved: Eno + Water → CO₂ bubbles (Relieves stomach upset ).
🌡️ Temperature /Light Change: Burning a candle → H eat + Light + CO₂
+ H₂O.
⚪ Precipitate Formation: Soap + Hard water → White scum (Doesn't
lather).
Skeleton Equation Example: Reactants → Products
Mg + O₂ → MgO
(Magnesium ribbon burns brightly, but this equation is unbalanced!)
⚖️ 3. Chemical Equations – The
Balancing Act
Why Balance? Law of Conservation of Mass: "Matter can't be created or
destroyed!" The number of atoms on the left must equal the atoms on the right
(Lavoisier's Law).
Step-by-Step Balancing Method
Example 1: Hydrogen + Oxygen → Water
1. Write unbalanced:
H₂ + O₂ → H₂O ❌
Chemical Reactions & Equations
Super Detailed Notes – Donkey Can Master It!
(Every tiny detail explained like a story. 100% Exam Ready. No confusion!)
📍 1. Chapter Map / What You'll
Learn
Chemical Reaction Basics
Writing & Balancing Equations
5 Types of Reactions (Detailed Examples)
Redox Reactions Deep Dive
Corrosion & Rancidity (Prevention Tricks)
Important Experiments
Exam Questions Solved
🧪 2. Chemical Reaction – The Magic
Change
Real Meaning: When substances chemically combine to form entirely new
substances with new properties.
, Everyday Example: Grass (you eat ) + Stomach acid → Poop + Energy
(Totally new substances!)
4 Clear Signs (Proof a Reaction Happened)
🎨 Colour Change: Apple slice turns brown (Enzymes react with oxygen).
🫧 Gas Evolved: Eno + Water → CO₂ bubbles (Relieves stomach upset ).
🌡️ Temperature /Light Change: Burning a candle → H eat + Light + CO₂
+ H₂O.
⚪ Precipitate Formation: Soap + Hard water → White scum (Doesn't
lather).
Skeleton Equation Example: Reactants → Products
Mg + O₂ → MgO
(Magnesium ribbon burns brightly, but this equation is unbalanced!)
⚖️ 3. Chemical Equations – The
Balancing Act
Why Balance? Law of Conservation of Mass: "Matter can't be created or
destroyed!" The number of atoms on the left must equal the atoms on the right
(Lavoisier's Law).
Step-by-Step Balancing Method
Example 1: Hydrogen + Oxygen → Water
1. Write unbalanced:
H₂ + O₂ → H₂O ❌
