thermal decomposition 3

 Certainly, Mayank! Here's a CBSE Class 10–style explanation of Activity 1.6: Thermal Decomposition of Lead Nitrate, perfect for use in your classroom lecture, revision notes, or student worksheets.

🔥 Activity 1.6 – Thermal Decomposition of Lead Nitrate

(From Chapter 1 – Chemical Reactions and Equations)

🎯 Aim:

To observe the decomposition of lead nitrate on heating and identify the products formed.

🧰 Materials Required:

  • 2 g lead nitrate (Pb(NO₃)₂)

  • Dry boiling tube

  • Spirit lamp or Bunsen burner

  • Tongs

🔍 Procedure:

  1. Take about 2 g of lead nitrate powder in a dry boiling tube.

  2. Hold the tube with tongs and heat it gently over a flame.

  3. Carefully observe the changes taking place.

👁️ Observation:

  • The white lead nitrate powder starts melting.

  • It releases brown fumes with a pungent smell.

  • A yellow solid residue is left at the bottom of the tube.

🧪 Chemical Reaction:

2Pb(NO3)2(s)→Heat2PbO(s)+4NO2(g)+O2(g)2\text{Pb(NO}_3)_2 (s) \xrightarrow{\text{Heat}} 2\text{PbO} (s) + 4\text{NO}_2 (g) + \text{O}_2 (g)

  • Lead nitrate decomposes to form:

    • Lead oxide (PbO) – yellow solid

    • Nitrogen dioxide (NO₂) – brown fumes

    • Oxygen (O₂) – gas

🔬 Type of Reaction:

  • ✅ Thermal Decomposition Reaction

  • ✅ Endothermic Reaction (requires heat input)

📘 Quick Recap Table:

Reactant Products Observation
Pb(NO₃)₂ (Lead nitrate) PbO (yellow solid), NO₂ (brown gas), O₂ (gas) Brown fumes, yellow residue
Reaction Type Thermal decomposition Involves heating

⚠️ Safety Tip:

NO₂ is a toxic gas, so this experiment should be performed in a fume chamber or well-ventilated lab, and under supervision.

🎤 Closing Line for Class:

“This reaction shows how heat can break a single compound into a mix of gas and solid — a true chemical split powered by temperature!”

Would you like a lab worksheet template, assessment question, or animated reaction video for this activity?

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