dsd Cal engine (b) snow melting (c) alcohol boiling (d) dynamite exploding 46. Y

Question

dsd Cal engine (b) snow melting (c) alcohol boiling (d) dynamite exploding 46. You have a mixture of oil and vinegar. Describe one way that you Vcould separate these from one another whicofhelowing onl representsachange of phase of a 47. substance? (a) Water levels in the lake drop during a drought. (b) You bake a cake and leave it in the oven too long, and it burns. (c) A candle melts in the sun. (d) You spill gasoline on the ground when you are filling your gas tank, and the gasoline quickly disappears. 42, It is often possible to separate a mixture of a solid and liquid by decantation. What does it mean to decant a liquid? You may need to refer to your dictionary to find the answer 49. In your own words, explain why, when a substance undergoes a phase change, it is a physical and not a chemical change. so. (a) Describe two ways that a mixture of water and sand (sand v is primarily silicon dioxide, SiO2) can be separated into its two components (b) Is the SiO, present in sand an element or a compound? (c) Can a physical or chemical change (or both) be used to break down the water and silicon dioxide further?

Explanation / Answer

Ans 46 :

There are many techniques to seperate the components of the mixture such as : distillation , filtration , evaporation and crystallisation , decantation , magnetic seperation and chromatography.

Since oil and vinegar are immiscible in each other , the best method to seperate them from each other is decantation.

The mixture is put into the decantation funnel , making sure the bottom tap is off. Then the mixture is left undisturbed for sometime so that they can seperate into layers. Now a beaker is put below the funnel and tap is gently opened.

When the denser liquid has been drained out in the beaker , the tap is closed and the lighter immiscible fluid is allowed to stay in funnel.

This can then be poured out of the funnel into a seperate beaker.

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