Photochemical reactions in Chemical Reactions and Equations – Class 10 Science Experiment

Chapter Name: Chemical Reactions and Equations

Activity Name: Photochemical reactions in Chemical Reactions and Equations

Activity Description:

Photochemical reactions in Chemical Reactions and Equations - Class 10 Science Experiment
Photochemical reactions in Chemical Reactions and Equations - Class 10 Science Experiment

This experiment focuses on studying photochemical reactions using silver bromide. The objective is to observe the color change of silver bromide when exposed to sunlight. Photochemical reactions involve the decomposition of light-sensitive substances in the presence of light energy.

Required Items:

  1. Silver bromide
  2. Watch glass

Step by Step Procedure:

  1. Take a small quantity of silver bromide and place it on a watch glass.
  2. Observe and note down the initial color of the silver bromide (light yellow).
  3. Position the watch glass in direct sunlight.
  4. Allow the silver bromide to be exposed to sunlight for some time.
  5. After exposure, carefully observe and record any changes in the color of the silver bromide.

Experiment Observations:

  • Initially, the silver bromide is light yellow in color.
  • After exposure to sunlight, the color of the silver bromide changes to gray.


  1. Handle silver bromide with care, as it may be harmful if ingested or inhaled.
  2. Use protective eyewear and gloves while conducting the experiment.
  3. Perform the experiment in a well-ventilated area.
  4. Avoid looking directly at the sun during the experiment to protect your eyes.

Lesson Learnt from Experiment:

This experiment demonstrates the photochemical decomposition of silver bromide into silver and bromine under the influence of sunlight. The change in color indicates a chemical reaction driven by light energy, highlighting the significance of photochemical reactions in chemical processes.

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