Practical Experiments and Activities in Class 7 Science

Science practical experiments and activities are an essential part of the Class 7 curriculum. These experiments and activities help students understand concepts better and develop practical skills. Here are some practical experiments and activities included in Class 7 Science:

1. Separation of Substances:
- Experiment: Separating a mixture of sand and water using filtration method.
Students are provided with a mixture of sand and water and are asked to separate the sand from the water using a filter paper and funnel.
- Activity: Separating a mixture of iron fillings and sand using a magnet.
Students are given a mixture of iron fillings and sand and are asked to separate the iron fillings from the sand using a magnet.

2. Physical and Chemical Changes:
- Experiment: Investigating the effect of heat on different substances.
Students are provided with different substances such as wax, sugar, and salt, and are asked to observe and record the changes that occur when these substances are heated.
- Activity: Burning of magnesium ribbon.
Students are asked to burn a small piece of magnesium ribbon and observe the changes that occur, such as the bright white light and the formation of a white powder.

3. Plant and Animal Tissues:
- Experiment: Observing different plant tissues under a microscope.
Students are given slides containing different plant tissues such as epidermis, parenchyma, and xylem, and are asked to observe and identify the different types of tissues.
- Activity: Dissecting a flower to identify its different parts.
Students are provided with a flower and are asked to dissect it to identify its various parts such as sepals, petals, stamens, and pistil.

4. Heat and Temperature:
- Experiment: Measuring the boiling point of water.
Students are asked to measure the boiling point of water using a thermometer and identify the temperature at which water changes from a liquid to a gas.
- Activity: Investigating the effect of heat on the rate of evaporation.
Students are provided with different liquids such as alcohol, water, and oil, and are asked to observe and record the time it takes for each liquid to evaporate at room temperature.

5. Acids, Bases, and Salts:
- Experiment: Testing the pH of different substances.
Students are provided with different substances such as lemon juice, vinegar, and soap solution, and are asked to test their pH using universal indicator paper.
- Activity: Observing the reaction between an acid and a base.
Students are asked to mix an acid (such as vinegar) with a base (such as baking soda) and observe the reaction, including the formation of bubbles and the release of gas.

These practical experiments and activities not only make the learning experience more engaging and interactive but also help students develop scientific temper, observation skills, and critical thinking abilities.