Question

WRITE THE CHEMICAL FORMULA OF THE FOLLOWING
b) Hydrogen sulphide
a) Calcium carbonate
() WRITE THE SEPARATION METHOD
a) Mixture of kerosene, water and salt
b) Mixture of mercury and water
13x3=9marks)​

Answer 1

Answer:

๛ Hydrogen Sulphide = H2S

๛ Hydrogen Sulphide = H2S๛ Calcium carbonate = CaCO3

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☞ Kerosene oil, water and salt can be separated with two techniques separating funnel and evaporation.

As Kerosene oil and water are immiscible in solution, so separating funnel separate them out in layers depending on their densities.

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☞ Mercury and water are separated by decantation by using separating funnel as the separation of two immiscible liquids by a separating funnel depends on the difference in their densities. Mercury is heavier than water therefore, forms the lower layer and separated from water.

# keep smiling ☺

Answer 2

Answer:

write.......................................................... following

(a) hydrogen sulphide - H2 S

(b) calcium carbonate - Ca Co3

write................................... method

(a) 1. pour the mixture of kerosene, water in superating funnel .

2. let it stand undisturbed for sometime, so the layers of kerosene and water will be separate.

3. open the stopcock of separating funnel and pour out the water layer carefully.

4. kerosene and water will be separated.

5. To separate water and salt put the water in sunlight for one day. then it is separated

(b) we will septate the mixture of Mercury and water by superating funnel. these two substance

have different densities and boiling Mercury, being the heaviest among two, comes out first via stop-clock . the density of water is lowest .