Activity 2

 Certainly, Mayank! Here's a clear, exam-focused, and student-friendly explanation for Activity 1.2 from Class 10 Science Chapter 1 – Chemical Reactions and Equations, highlighting procedure, observations, conclusions, and relevance.

🧪 Activity 1.2 – Reaction Between Lead Nitrate and Potassium Iodide

🧰 Materials Required:

  • Test tube

  • Lead nitrate solution (Pb(NO₃)₂)

  • Potassium iodide solution (KI)

  • Dropper

🔄 Procedure:

  1. Take a small amount of lead nitrate solution in a test tube.

  2. Add a few drops of potassium iodide solution using a dropper.

  3. Gently shake the test tube and observe the reaction.

👁️ Observation:

✅ A bright yellow precipitate forms immediately.
✅ The test tube becomes cloudy due to the solid formed.

🧪 Conclusion:

  • A new, insoluble substance (precipitate) is formed.

  • This indicates a chemical reaction has taken place.

✅ This is a classic example of a double displacement reaction and a precipitation reaction.

⚖️ Balanced Chemical Equation:

Pb(NO3)2(aq)+2KI(aq)→PbI2(s)+2KNO3(aq)\text{Pb(NO}_3)_2 (aq) + 2\text{KI} (aq) \rightarrow \text{PbI}_2 (s) + 2\text{KNO}_3 (aq)

  • PbI₂ is lead iodide, a yellow solid (precipitate).

  • KNO₃ remains dissolved in solution.

📘 CBSE Exam Relevance:

Possible Questions Marks
"What happens when Pb(NO₃)₂ is mixed with KI?" 1 mark
"Write the balanced equation for the above reaction." 1–2 marks
"What type of reaction is this?" 1 mark

✅ Correct answer: It is a double displacement and precipitation reaction.

🧠 Signs of a Chemical Reaction in This Activity:

  • Colour change: Clear solutions form a yellow solid

  • Formation of precipitate: PbI₂ is insoluble

  • New substance: Evidence of chemical change

💬 Ask Your Students:

  1. What does the formation of a yellow precipitate tell you?

  2. Is this reaction reversible?

  3. Which type of reaction is taking place?

🎤 Closing Thought:

“In a few drops and seconds, a whole new substance forms before your eyes. This is the power of chemical change, and chemistry helps us predict and understand it.”

Would you like a lab record sheet, reaction type sorting card, or digital animation to visually show the precipitate forming?

Comments

Post a Comment

Popular posts from this blog

⚡ Electrolytic Decomposition Reaction

Certainly, Mayank! Here's a Class 10–level explanation of Electrolytic Decomposition Reaction , aligned with the CBSE syllabus and written in a clear, engaging, and exam-ready format for your students. ⚡ Electrolytic Decomposition Reaction (From Chapter 1: Chemical Reactions and Equations – Class 10 Science) 🎯 Definition: An electrolytic decomposition reaction is a chemical reaction in which a compound is broken down into simpler substances using electricity . ✅ The process of using electric current to split a compound is called electrolysis . 📘 General Reaction Format: A B → Electricity A + B AB \xrightarrow{\text{Electricity}} A + B 🧪 Example: Electrolysis of Water (As shown in NCERT Activity 1.7) 2 H 2 O (l) → Electricity 2 H 2 ( g ) + O 2 ( g ) 2\text{H}_2\text{O (l)} \xrightarrow{\text{Electricity}} 2\text{H}_2 (g) + \text{O}_2 (g) Water (H₂O) splits into: Hydrogen gas (H₂) → collected at cathode Oxygen gas (O₂) → collected at anode The ...
Read more

🔥 Activity 1.11 – Oxidation and Reduction (Redox Reaction)

 Certainly, Mayank! Here's a CBSE Class 10–aligned explanation of Activity 1.11 , along with an answer to the Recall of Activity 1.1 . The focus is on conceptual clarity, oxidation-reduction (redox) concepts, and exam readiness. 🔥 Activity 1.11 – Oxidation and Reduction (Redox Reaction) (Class 10 Science – Chapter 1: Chemical Reactions and Equations) 🎯 Objective: To demonstrate how a metal (copper) undergoes oxidation and how the product can be reduced using hydrogen gas. 🧪 Materials Required: Copper powder (about 1 gram) China dish Heat source (burner or spirit lamp) Hydrogen gas (for part 2 of the reaction) 🔬 Procedure: Take a small quantity of copper powder in a china dish . Heat the copper gently. Observe any colour change. Now, pass hydrogen gas over the heated copper oxide . 👁️ Observations: Step What Happens Chemical Equation 1. Heating copper Surface turns black due to formation of copper(II) oxide (CuO) 2 Cu...
Read more

🧪 Precipitation Reaction

 Certainly, Mayank! Here's a clear, CBSE-exam–oriented explanation of the Precipitation Reaction for Class 10 Science students, with definitions, examples, and concepts aligned with the NCERT syllabus. 🧪 Precipitation Reaction (Class 10 Science – Chapter 1: Chemical Reactions and Equations) 📘 Definition: A precipitation reaction is a type of chemical reaction in which two aqueous solutions react to form an insoluble solid called a precipitate . ✅ This precipitate appears as a solid that settles at the bottom of the reaction mixture. 🔬 General Form: A B ( a q ) + C D ( a q ) → A D ( s ) ↓ + C B ( a q ) AB (aq) + CD (aq) \rightarrow AD (s) ↓ + CB (aq) AB and CD are aqueous ionic compounds AD is the precipitate (solid) CB remains dissolved in water (aqueous) 🧪 Examples from NCERT / CBSE Class 10: ✅ 1. Barium Chloride + Sodium Sulphate (Activity 1.10) BaCl 2 ( a q ) + Na 2 SO 4 ( a q ) → BaSO 4 ( s ) ↓ + 2 NaCl ( a q ) \text{BaCl}_2 (aq) + \te...
Read more