Separation Techniques at IGCSE Level

What is the process of separating sand from water by using filter paper called?

• Condensation

• Evaporation

• Filtration

• Distillation

Name the separation technique used to separate a mixture of sand and salt.

• Evaporation

• Distillation

• Magnetism

• Filtration

What is the method used to separate sand from water in a school science experiment?

• Sublimation

• Distillation

• Filtration

• Evaporation

Explain the process of distillation and its application in separation techniques in the context of a chemistry lab experiment.

• Distillation is a process used to separate components of a solid mixture based on differences in melting points.

• Distillation is used in separation techniques to separate components of a liquid mixture based on differences in boiling points.

• Distillation is used to combine components of a liquid mixture based on differences in boiling points.

• Distillation is a technique used to separate components of a gas mixture based on differences in density.

What is the principle behind the separation technique of chromatography?

• Size difference between substances

• Temperature difference between substances

• Magnetic attraction between substances

• Affinity for stationary and mobile phases

Describe the process of centrifugation and its application in separation techniques.

• Centrifugation is only used in cooking to separate oil from water.

• Centrifugation is used to mix components of a mixture based on their different densities.

• Centrifugation is used in separation techniques to separate components of a mixture based on their different densities, such as separating blood cells from plasma in medical laboratories.

• Centrifugation is not a real process and has no application in separation techniques.

What is the purpose of using a solvent in the separation technique of evaporation?

• To dissolve the solute and facilitate the separation of the components

• To speed up the separation process

• To decrease the rate of evaporation

• To increase the boiling point of the solution

Explain the process of magnetic separation and its application in separation techniques.

• Magnetic separation is not used in any industry for separation purposes.

• Magnetic separation is only used in the medical industry to separate blood components.

• Magnetic separation is used in the mining industry to separate valuable minerals from waste rock, in recycling to separate ferrous metals from non-ferrous metals, and in the food industry to remove magnetic contaminants from food products.

• Magnetic separation is a process used to separate different colors of paint.

What is the role of solubility in the separation technique of fractional crystallization?

• Solubility determines the color of the crystals formed

• Solubility has no role in fractional crystallization

• Solubility determines which substances will crystallize out first from a solution.

• Solubility affects the temperature of the solution

Describe the process of sieving and its application in separation techniques.

• Sieving is a method of separating particles based on their size and is commonly used in the food and construction industries.

• Sieving is a method of separating particles based on their weight and is commonly used in the fashion industry.

• Sieving is a method of separating particles based on their shape and is commonly used in the automotive industry.

• Sieving is a method of separating particles based on their color and is commonly used in the pharmaceutical industry.