Chapter Name: Separation of Substances
Activity Name: Separation of different materials from the mixture in Separation of Substances
In this experiment, we will separate a mixture of sand, sawdust, and salt by using water as a medium. By observing the behavior of the substances in water, we can identify which substances float, settle at the bottom, or dissolve in the water.
- Stirring rod or spoon
Step by Step Procedure:
- Take a beaker and fill it halfway with water.
- Add the mixture of sand, sawdust, and salt to the beaker.
- Stir the mixture well using a stirring rod or spoon to ensure proper mixing.
- Allow the mixture to stand undisturbed for 10 minutes.
- Observation: After 10 minutes, we observe that the substances in the mixture behave differently in water.
- Substance floating on the water: The sawdust particles float on the surface of the water.
- Collecting the floating substance: We can collect the sawdust by skimming it off the water surface using a spoon or any suitable tool.
- Substance settling at the bottom: The sand particles settle at the bottom of the beaker.
- Collecting the settled substance: We can pour the water carefully into another container, leaving behind the settled sand at the bottom.
- Substance dissolved in the water: The salt dissolves in the water, becoming a part of the water itself.
- Getting back the dissolved substance: We can separate the dissolved salt from the water through the process of evaporation. By heating the water, the water molecules will evaporate, leaving the salt behind, which can be collected.
- Handle the glass beaker carefully to avoid any breakage or injury.
- Use a suitable tool to stir the mixture gently, ensuring the safety of the apparatus.
- Avoid ingesting or inhaling any of the substances used in the experiment.
- Dispose of the separated substances properly according to local guidelines.
Lesson Learnt from Experiment:
- This experiment demonstrates that different substances can be separated from a mixture based on their properties.
- Sawdust floats on water due to its low density.
- Sand settles at the bottom due to its higher density.
- Salt dissolves in water, forming a homogeneous mixture.
- By understanding the properties of substances and utilizing appropriate separation techniques, we can separate them effectively.