Question
1. What is the process by which water is separated by heating?
Answer
⇒ Distillation
Distillation, process involving the conversion of a liquid into vapour that is subsequently condensed back to liquid form. This basic operation requires the use of a still or retort in which a liquid is heated, a condenser to cool the vapour, and a receiver to collect the distillate.
Question
2. Which of the following mixture can be separated by decantation?
Answer
⇒ Oil and Vinegar
A common example is decantation of oil and vinegar. When a mixture of the two liquids is allowed to settle, the oil will float on top of the water so the two components may be separated. Kerosene and water can also be separated using decantation.
Question
3. To separate rock into different sized particles for road building and other construction project, which technique is applicable?
Answer
⇒ SIFTING
Sifting is used to separate smaller solid particles from larger solid particles.
For example, the mixture of different sized solid particles can be put into a container that has a screen material at the bottom with holes of a certain size.
Question
4. What is the best technique in separating mixture of metals from other junk?
Answer
⇒ Aided by Magnets
Iron, nickel, cobalt and gadolinium are naturally ferromagnetic elements. Common usage of the term "magnetic" refers to this form of magnetism. Other elements are capable of forming magnetic compounds, but are not magnetic in their pure states.
Question
5. It is done by passing a suspension through a filter paper retains the solid components of the mixture?
Answer
⇒ Filtration
Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )
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