Question

Give reasons: pls help quick

Answer 1

Answer:

1. Those fraction with very low solubilities will be the first to crystallise out from the solution and will be seperated out. Pressure and temperature influence the solubility of gases in water.
2. Liquids and solids exhibit practically no change of solubility with changes in pressure Gases as might be expected, increase in solubility with an increase in pressure.
3. When we heat a hydrated copper sulphate crystal then the water is evaporated and the blue colour of copper sulphate turns into colourless, and the solution becomes anhydrous because the water molecules are evaporated. The 5 water molecules of Blue copper sulphate is evaporated and it seems to be a chemical change.
4. Efflorescence, spontaneous loss of water by a hydrated salt, which occurs when the aqueous vapour pressure of the hydrate is greater than the partial pressure of the water vapour in the air.
5. Boiler scale is caused by impurities being precipitated out of the water directly on heat tranfer surfaces or by suspended matter in water setting out on the metal and becoming hard and adherent in a boiler causes impurities to concentrate. These salts reach the deposit site in a soluble form and precipitate.

Explanation:

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Answer 2

Answer:

the answers are in the picture.........

Explanation:

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