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Questions 2.5a

  1. What difference between sand and water (or the black solid used) does this separation rely on? ----
  2. Name the material used in this method to cause separation of the mixture ----
  3. Why is this material able to cause separation? -----------------------------
  4. Suggest a name for this method of separation. ------------------------
  5. What is the use of glass rod? ---------------------------------
  6. Name any five (5) other substances that flow like water. -----------------------
  7. Name two other binary mixtures which can be separated using this method. ---
  8. Why is this method not suitable for separating a solution of sodium chloride or other salts in water?


Answers to Questions 2.5a

  1. Water consists of lose tiny particles which can pass through the pores in a filter paper; sand does not.
  2. Filter paper.
  3. It has small holes which allow liquids to pass through but not solids.
  4. Filtration method.
  5. To prevent over-tilting of the beaker as this would large amount of sand to pour onto the filter funnel, slowing down the process and damaging the filter paper.
  6. Ethanol, methanol, propanone, petrol, kerosene, and other thin liquids.
  7. Water and iodine, water and sulphur, muddy water, mashed leaves/flower and water, ethanol and fermenting solids, water and flour, oil and metal or dust particle, sand and oil, (any liquid with any insoluble substance).
  8. The particles of both the solvent (water) and solute (salt) are small; so they both pass through the filter paper.