How do we know that a chemical reaction has taken place | For class 10th | Based on NCERT

In this video, we'll explore some simple yet fascinating chemical reactions using everyday chemicals and basic lab equipment. Join us as we conduct experiments to observe how different substances interact and form new compounds. This is a great educational activity for students and enthusiasts alike to learn about the fundamentals of chemical reactions.
Materials Needed:
Lead nitrate solution
Potassium iodide solution
Zinc granules
Dilute HCl (Hydrochloric acid)
Quick lime (Calcium oxide)
Water
NaOH (Sodium hydroxide) solution
Phenolphthalein indicator
Common salt (Sodium chloride)
Iron filings
Test tubes and test tube stand
Dropper
Micro spatula
China dish
Magnet
Pair of tongs
Procedure:
Preparation:
Label four test tubes as A, B, C, and D.
Experiment in Test Tube A:
Add a few drops of potassium iodide solution to test tube A.
Add a few drops of lead nitrate solution to the same test tube.
Observe the formation of a yellow precipitate, indicating a chemical reaction.
Experiment in Test Tube B:
Place a zinc granule in test tube B.
Add a few drops of dilute HCl to the test tube.
Observe the effervescence and the evolution of hydrogen gas.
Experiment in Test Tube C:
Add a spatula full of quick lime to test tube C.
Add 1 mL of water to the quick lime.
Touch the test tube and feel the increase in temperature, indicating an exothermic reaction. Calcium hydroxide is formed.
Experiment in Test Tube D:
Add a few drops of NaOH solution to test tube D.
Add 1-2 drops of phenolphthalein indicator.
Observe the color change to pink, indicating the presence of a new chemical substance.
Physical Change Observation:
Mix common salt and iron filings in a China dish.
Observe the mixture for any color change, temperature change, precipitate formation, or gas evolution.
Pass a magnet through the mixture to separate the iron filings from the salt.
Note that no new substance is formed, indicating a physical change.
Conclusion:
Chemical reactions bring changes in the chemical properties of matter, resulting in the formation of new substances. In our experiments, we observed:
Yellow precipitate formation in test tube A.
Hydrogen gas evolution in test tube B.
Temperature increase and calcium hydroxide formation in test tube C.
Color change in test tube D.
Mixing common salt with iron filings is a physical change, as no new chemical substance is formed.
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Tags: #ChemicalReactions #ScienceExperiments #Educational #Chemistry #ScienceForKids #LabExperiments #DIYScience #ChemistryExperiments #SchoolScience
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Music: Music: aime
Musician: Rook1e
Disclaimer:
Ensure all experiments are conducted under proper supervision and safety guidelines are followed. Always prioritize safety by using appropriate personal protective equipment (PPE) such as safety goggles. Note: In this video, gloves were not worn, which is not recommended.

[@prashantyadav4224]

Excellent

[@user-rw7fj6tc1l]

❤❤❤

[@prashantyadav4224]

What a nice theory quite impressive 🎉 thanks for your information ❤

[@bundelalab]

You're welcome 😊