Class 9th Activity

 

🔬 Activity 1: To Prepare a True Solution (e.g., Salt or Sugar in Water)

Materials Required:

• Beaker

• Water

• Salt/Sugar

• Glass rod

Procedure:

1. Take 100 ml of water in a beaker.

2. Add one teaspoon of salt/sugar and stir with a glass rod.

3. Observe if the solute completely dissolves.

Observation:

• The salt/sugar dissolves completely forming a homogeneous solution.

Conclusion:

• A true solution is transparent and solute particles are not visible.

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🧪 Activity 2: To Prepare a Suspension (e.g., Sand in Water)

Materials Required:

• Sand

• Water

• Beaker

• Stirrer

Procedure:

1. Mix sand into water and stir well.

2. Allow the mixture to stand.

Observation:

• The sand settles down over time.

Conclusion:

• This is a heterogeneous mixture called a suspension.

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⚗️ Activity 3: To Separate a Mixture of Salt and Sand

Materials Required:

• Mixture of salt and sand

• Water

• Filter paper

• Funnel

• Beakers

Procedure:

1. Add the salt-sand mixture to water and stir.

2. Filter the mixture using filter paper.

3. Evaporate the filtrate to recover salt.

Observation:

• Sand remains on the filter paper; salt is recovered after evaporation.

Conclusion:

• Filtration and evaporation help separate components of a mixture.

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🌡️ Activity 4: To Perform Evaporation to Separate a Dye from Ink

Materials Required:

• Ink (blue/black)

• Evaporating dish

• Burner or hot plate

Procedure:

1. Pour a few drops of ink into the evaporating dish.

2. Heat it slowly and observe.

Observation:

• Water evaporates, and the dye residue is left behind.

Conclusion:

• Ink is a mixture, and its components can be separated by evaporation.

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🎯 Bonus Activity: Chromatography (Optional but Fun)

Materials Required:

• Strip of filter paper

• Black ink/dot from a sketch pen

• Glass with water

Procedure:

1. Draw a dot using black ink on filter paper.

2. Dip the bottom of the strip in water (without submerging the dot).

3. Observe the ink separating into colors.

Observation:

• The black ink separates into different colors.

Conclusion:

• Ink is a mixture of dyes. This method is called paper chromatography.