Lesson 2.2 Homework

How would you separate the water from seawater?

• Filtration

• Distillation

• Sedimentation

• Decantation

How would you separate the ethanol from an ethanol+water solution?

• Simple distillation

• Filtration

• Fractional distillation

• Evaporation

What do you understand by the term sublimation?

• The process by which a liquid changes directly into a gas

• The process by which a solid changes directly into a gas

• The process by which a gas changes directly into a solid

• The process by which a solid changes directly into a liquid

What type of substance was chromatography originally designed to separate?

• Colorless substances

• Ions in a solution

• Colored substances

• Gases in a mixture

How can we now extend the use of chromatography to separate colorless substances?

• By using heat

• • By using techniques such as UV light, chemical reagents, or staining

• By changing the solvent

• By increasing the sample size

Define the term Rf value in connection with chromatography.

• The distance traveled by the substance divided by the distance traveled by the solvent

• The distance traveled by the substance divided by the distance traveled by the solute

• The distance traveled by the solute divided by the distance traveled by the solvent

• The distance traveled by the solvent divided by the distance traveled by the substance

Декантація

• Filtration

• Centrifugation

• Decanting

• Crystallisation

Фільтрація

(a)  

Центрифугування

(a)  

Осад

• Filtrate

• Residue

• precipitate

• Contamination