decomposition activity

 Certainly, Mayank! Here's a clear, CBSE-style explanation of the Barium Hydroxide + Ammonium Chloride activity, ideal for student understanding, classroom discussion, or exam preparation.

❄️ Activity – Reaction Between Barium Hydroxide and Ammonium Chloride

(Class 10 Science – Chapter: Chemical Reactions and Equations)

🎯 Objective:

To observe the thermal effect of a chemical reaction and identify whether it is exothermic or endothermic.

🧰 Materials Required:

  • Barium hydroxide (Ba(OH)2)(\text{Ba(OH)}_2) – about 2 g

  • Ammonium chloride (NH4Cl)(\text{NH}_4\text{Cl}) – about 1 g

  • Test tube

  • Glass rod

🔬 Procedure:

  1. Take about 2 g of barium hydroxide in a test tube.

  2. Add 1 g of ammonium chloride to it.

  3. Mix the two solids using a glass rod.

  4. Touch the bottom of the test tube with your palm.

👁️ Observation:

  • The test tube becomes very cold to the touch.

  • Sometimes you may notice the formation of a colorless gas with a pungent smell (ammonia).

  • The mixture becomes slushy, indicating the formation of a liquid.

✅ Conclusion:

  • The reaction absorbs heat from the surroundings (your palm).

  • Hence, it is an endothermic reaction.

🧪 Chemical Equation (Simplified):

Ba(OH)2+2NH4Cl→BaCl2+2NH3+2H2O\text{Ba(OH)}_2 + 2\text{NH}_4\text{Cl} \rightarrow \text{BaCl}_2 + 2\text{NH}_3 + 2\text{H}_2\text{O}

  • Barium chloride (BaCl₂) – formed as a salt

  • Ammonia gas (NH₃) – gives pungent smell

  • Water (H₂O) – makes the mixture wet and slushy

📘 CBSE Exam Insight:

Q: What type of reaction is observed between barium hydroxide and ammonium chloride?
✅ Answer: It is an endothermic reaction because the system absorbs heat, making the test tube feel cold.

🎤 Final Thought for Students:

“Not all reactions warm you up — some silently suck heat away. That’s the science of endothermic changes in action!”

Would you like this turned into a lab sheet, concept card, or mini-quiz for your classroom?

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