a) What is the mass of 1 mole of nitrogen atoms?
b) Which separation techniques will you apply for the separation of the following?
(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals.
Answers
Answer:
a) Mass of one mole of nitrogen atoms is 14 g.
c) The evaporation method will isolate the sodium chloride from its solution in water. During the process, water evaporates leaving behind the sodium chloride in the container
d) During the process, water evaporates leaving behind the sodium chloride in the container. (2) By sublimation process, ammonium chloride can be obtained as sublime from the mixture which contains sodium chloride and ammonium chloride.
e) Small pieces of metal in the engine oil of a car – vacuum filtration. This is because vacuum filtration is performed under pressure, so it will be able to separate the dense oil from the metal piece
f) The pigments from an extract of flower petal can be separated out by the process of chromatography. Chromatography is a technique of separation of substances which are very close in their molecular weight but differ in their molecular sizes.
Explanation:
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