A mixture of pebbles, fine sand and salt was sieved. What passed through the sieve was mixed with water and allowed to stand. A sediment formed. The clear liquid was poured off and evaporated. The sediment was also dried. Use a flowchart to show the procedure and what was collected.
Answers
Mixture
(Pebbles, Salt, Sand)
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Pebbles removed by sieving
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Sand and Salt then mixed with water
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Sand forms the sediment
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Salt gets dissolved in water
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On evaporating the liquid, we get salt
So, as per the question the points that can explain this flowchart are:
1) pebbles are sieved and separated from the mixture of pebbles, sand and salt.
2) after sieving, salt and sand are left, which are then mixed into water.
3) on mixing, the sand settles at the bottom as sediment where salt gets dissolved in water.
4) later on the liquid is separated from the sediment and is evaporated. The liquid after evaporation leaves another residue or sediment, which is salt.
A mixture of pebbles, fine sand and salt was sieved. During sieving, fine sand and sand passes out and pebbles remain because of their large size. So pebbles are separated.
Next, the mixture of sand and fine sand is mixed with water is allowed to stand. The sand settles down gradually as sediment under the effect of gravity. This process is called sedimentation. The clear water is then poured off into another container. This process is called decantation. So, after sedimentation and decantation, sand gets separated.
Now, the mixture consists of fine sand and water. This mixture is evaporated. Hence, the water evaporates and we get fine sand.
(See the image for the flowchart. I suggest you make your own flowchart.)
