Observe the changes in ice in Changes around Us – Class 7 Science Experiment

Chapter Name: Changes around Us

Activity Name: Observe the changes in ice in Changes around Us

Activity Description:

Observe the changes in ice in Changes around Us - Class 7 Science Experiment

In this experiment, we observe the changes that occur in ice when it is heated and cooled. Additionally, we repeat the experiment using candle wax to compare the observations.

Required Items:

  • Beaker
  • Ice cubes
  • Heat source (e.g., a Bunsen burner or a stove)
  • Candle wax
  • Candle or a heat source for melting the wax

Step by Step Procedure:

  1. Take a few pieces of ice and place them in the beaker.
  2. Heat the beaker with the ice using the heat source shown in the figure until the ice melts and turns into water.
  3. Continue heating the water, and observe as it changes into steam.
  4. To reverse the process, reduce the temperature of the steam by removing the heat source or using a cooling agent. Observe the steam as it changes back into water and then into ice.

Experiment Observations:

  • As the ice is heated, it slowly melts and transforms into water.
  • With further heating, the water evaporates and changes into steam.
  • When the heat is removed or the steam is cooled, it condenses back into water, and upon further cooling, it solidifies back into ice.

Precautions:

  1. Handle the heat source carefully and use it under adult supervision.
  2. Avoid direct contact with hot surfaces.
  3. Use appropriate safety gear, such as gloves, when handling hot objects.
  4. Ensure the beaker is heat-resistant and can withstand temperature changes.

Lesson Learnt from Experiment:

Through this experiment, students will learn about the three states of matter: solid, liquid, and gas. They will observe how heat can cause substances to change their state, from ice (solid) to water (liquid) to steam (gas) and vice versa. It demonstrates the concept of phase changes and the reversibility of these processes with temperature variations.

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