Class 8 Science| Unit 5 Lecture 3 |"Types of Chemical Reactions & Law of Conservation of Mass.

Описание: Welcome to Learn with Ahmed Atta!
In this Grade 8 Science Lecture ,you 'll learn all about Types of Chemical Reactions and the Law of Conservation of Mass in the easiest and most visual way.Types of Chemical Reactions

Reactant → Product

Bond Formation

Bond Breaking

Heat Release

Ion Exchange

Electron Transfer

Energy Change
│
├──► 1. Addition (Combination) Reaction
│ A + B → AB
│ Example: H₂ + Cl₂ → 2HCl
│ → Two or more substances combine to form one product
│ → Usually releases energy (exothermic)
│
└──► 2. Decomposition Reaction
AB → A + B
Example: 2H₂O → 2H₂ + O₂
→ One compound breaks down into simpler substances
→ Requires energy (endothermic) Before Reaction (Reactants) After Reaction (Products)
↓ ↓
Total Mass = X g Total Mass = X g
We 'll explore:2H₂ + O₂ → 2H₂O
Atoms before = Atoms after ✔
Hydrogen atoms = 4 on both sides
Oxygen atoms = 2 on both sides
Key Principle
Mass is neither created not destroyed during a chemical reaction.
The total mass of reactants =total mass of products.
Addition (Combination) Reactions -when substances combine to form new ones.
Decomposition Reactions -when compounds break down into simpler substances.
Law of Conservation of Mass- showing that matter is never lost only rearranged !
Perfect for :
Class 8 students
Teachers & early science learners
Anyone who wants clear,simple and visual science explanations.
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