Class 9 New Chemistry Chapter 5 Notes PDF – Energetics

Topics Covered in Chapter 5 – Energetics

1. Introduction to Energetics
Energetics ka matlab hota hai energy ka chemical reactions me role. Ye chapter batata hai ke energy kaise release ya absorb hoti hai.

2. Exothermic aur Endothermic Reactions

Exothermic reactions wo hoti hain jin me energy release hoti hai (e.g. burning of fuels).

Endothermic reactions wo hoti hain jin me energy absorb hoti hai (e.g. photosynthesis).

3. Heat of Reaction (ΔH)
Har chemical reaction ke saath energy change hoti hai. Isay ΔH se show karte hain.
Agar ΔH negative ho to reaction exothermic hoti hai.
Agar ΔH positive ho to reaction endothermic hoti hai.

4. Energy Level Diagrams
Diagrams jo show karte hain ke reactants aur products ke darmiyan energy ka kya farq hai.

5. Bond Energy
Chemical bonds break aur form hotay hain during reactions. Har bond ki breaking aur making me energy involved hoti hai.

6. Application of Energetics in Daily Life
Fuels ka burn hona, ice ka melt hona, aur neutralization reactions — sab me energetics involved hai.

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