Separations by Veronica, Amal, Dedaar and SaraPresentation Transcript
• Sieving• Filtration• Decanting• Floatation• Evaporation• Distillation By Amal, Sara & Veronica
Sieving is a way to separate substances in a mixture. Sieving separates big substances from small substances. Sieving can also be used to separate substances that don’t dissolve in the liquid. Sieving only works for separating insoluble substances from the other substance. For example separating big rocks from small rocks. Sieving cannot separate dissolved substances from the solvent
Filtration is when you use filter paper to separate liquids and solids. Filtering is also another way to separate substances in a mixture. Filtration is used to separate liquids and solids that don’t dissolve in the liquids.
You can use a special case of sedimentation in science experiments. If you let sand settle to the bottom, then tip out the clear liquid at the top, you have decanted the liquid. This is an easy separation. Decanting means to pour off a liquid on top to leave behind the sediment.
Floatation is when an undissolved substance floats on top of another. For example, oil floats on top of water and can be separated using a separating funnel.
Evaporation is a way to separate water andsalt from saltwater. To separate the saltfrom the water you have to use a BunsenBurner and boil the water. Eventually all ofthe water will evaporate and leave behindthe salt.
Evaporating Dish TripodBunsen Burner
Distillation is the process where salt and wateris separated from salt water. In distillation, saltwater is placed in a boiling flask and heated tothe boiling point of water, 100 degrees C. Thewater boils, evaporates and becomes steam.The steam travels along the condenser. Thesteam inside the condenser is cooled to below100 degrees C and condenses to form liquidwater. The condenser is kept cool by runningcold water through its outer jacket.
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