Separation of Mixtures and Purification of Chemical Substances
Chemistry · 50 practice questions
Pure and impure substances; boiling and melting points; elements, compounds and mixtures; chemical and physical changes; separation processes — evaporation, simple and fractional distillation, sublimation, filtration, crystallization, paper and column chromatography, magnetization, decantation.
- Distinguish between pure and impure substances.
- Use boiling and melting points as criteria for purity.
- Distinguish between elements, compounds and mixtures.
- Differentiate chemical from physical changes.
- Identify the properties of components of a mixture.
- Specify the principle involved in each separation method and apply it in everyday life.
Try a few questions
- Practice question 1
A mixture of two immiscible liquids, such as oil and water, is mainly separated using a
- A.fractionating column
- B.separating funnel
- C.chromatography paper
- D.sublimation apparatus
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B. separating funnel
A separating funnel exploits the density difference to let the two immiscible layers be run off separately.
- Practice question 2
Magnetization (magnetic separation) is mainly suitable for separating a mixture of
- A.salt and water
- B.oil and water
- C.iron filings and sand
- D.ethanol and water
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C. iron filings and sand
A magnet can pull out the magnetic iron filings, leaving the non-magnetic sand behind.
- Practice question 3
Column chromatography mainly separates the components of a mixture based on their
- A.differing melting points
- B.differing degree of adsorption onto the packing material as a solvent passes through
- C.differing magnetic properties
- D.differing rates of sublimation
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B. differing degree of adsorption onto the packing material as a solvent passes through
Column chromatography relies on components adsorbing to differing extents onto the stationary packing material.
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