Observe some chemical changes in Changes around Us – Class 7 Science Experiment

Chapter Name: Changes around Us

Activity Name: Observe some chemical changes in Changes around Us

Activity Description:

Required Items:

1. Glass tumbler
2. Water
3. Copper Sulphate (CuSO4)
4. Sulphuric Acid (H2SO4)
5. Iron nail (Fe)
6. Another beaker

Step by Step Procedure:

1. Take a glass tumbler and fill it halfway with water.
2. Add a teaspoonful of Copper Sulphate (CuSO4) to the water in the tumbler.
3. Add a few drops of Sulphuric Acid (H2SO4) to the Copper Sulphate solution.
4. Observe any change in color in the solution.
5. Take a sample of the solution in another beaker and set it aside.
6. Add an Iron nail (Fe) to the solution in the first beaker.
7. Keep the beaker undisturbed for half an hour.
8. Compare the color of the solution with the Iron nail to that of the sample solution kept aside.
9. Remove the Iron nail from the beaker and observe it for any changes.

Experiment Observations:

1. The blue-colored solution changes into green.
2. A brown-colored deposit is seen on the Iron nail.

Precautions:

1. Handle Sulphuric Acid with care and wear appropriate safety gear like gloves and goggles.
2. Avoid inhaling the fumes produced during the experiment.
3. Dispose of the chemical waste properly according to safety guidelines.

Lesson Learnt from Experiment:

The experiment demonstrates chemical changes, where the Copper Sulphate and Iron react with each other. The change in color of the solution indicates the formation of a new substance, Iron Sulphate. Additionally, the brown deposit on the Iron nail indicates the formation of another new substance, Copper.