.Answer all the question?
1. Name the different methods of separation?
2 When can sieving be done?
3. Why is it not advisable to sieve wheat flour?
4. Differentiate between sedimentation and decantation?
5. What is filtration? Give two common examples of filtration?
6. How is a solute different from the solvent? Give two examples of a common solute?
7. What is threshing? Explain the ways in which threshing is commonly done?
8. What is winnowing? How is it done?
9. What is hand-picking? When is this method used?
10. Define saturated solution? How would you prepare a saturated solution of sugar in water?
11. What are the factors that affect the solubility of a solute?
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Answers
Answer:
1.Handpicking.
Threshing.
Winnowing.
Sieving.
Evaporation.
Distillation.
Filtration or Sedimentation.
Separating Funnel.
2.Sieving can be used for separating the mixtures containing components of different sizes. For example, a mixture of sand and stones can be separated by the process of sieving. Fine sand particles pass through the holes of the sieve, while stones which are big in size remain on the sieve.
3.It is not advisable to sieve wheat flour because, on sieving, wheat bran, which is rich in nutrients and fibre, is removed. It is better to hand-pick and remove the impurities.
4.The key difference between sedimentation and decantation is that the sedimentation allows the separation of two substances via settling of one substance whereas the decantation allows the separation of two substances via pouring off one substance.
5.Brewing coffee involves passing hot water through the ground coffee and a filter. ...
The kidneys are an example of a biological filter. ...
Air conditioners and many vacuum cleaners use HEPA filters to remove dust and pollen from the air.
6.Solvents are generally liquid (water is the most common example), but can also be gas or solid. Solutes are the materials that are dissolved into solvents and we end up with solution. ... For example milk (solvent) and sugar (solute) makes sweet milk. Air is made up of gases (oxygen, nitrogen, carbon dioxide, etc.).
7.The process of beating harvested crops to separate the grains from the stalks (the dried stems) is called threshing. ... Sometimes, threshing is also done by crushing stalks under the feet of bullocks. Threshing can also be done by using machines such as the combine harvester.
8.Winnowing is the method of separating husk from grains with the help of wind. ... So, the husk forms a separate heap at a small distance away from the heap of wheat grains. In this way ,husk gets separated from wheat grains. The method of winnowing is used to separate husk from various types of grains like wheat, rice.
9.The method of hand picking is used to separate those mixtures where one of the component is in small quantity. The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.
10.By definition a saturated solution is a solution that contains as much solute as can dissolve in a given solvent at a given temperature.
To prepare a saturated solution of sugar just add sugar to water and stir the solution.
11.Solubility is the maximum amount of a substance that will dissolve in a given amount of solvent at a specific temperature. There are two direct factors that affect solubility: temperature and pressure. Temperature affects the solubility of both solids and gases, but pressure only affects the solubility of gases.
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