CHEMISTRY QUIZ

What is the main focus of Week 1 in the chemistry curriculum?

• Separation Techniques

• Everyday Materials and Their Physical Properties

• Purity of Substances

• Chromatography

Which of the following is NOT a property of materials discussed in Week 1?

• Malleability

• Ductility

• Density

• Solubility

What method is used to separate a mixture of iron fillings and sand?

• Evaporation

• Centrifugation

• Filtration

• Magnetization

Which separation technique involves using a filter paper?

• Decantation

• Filtration

• Sublimation

• Centrifugation

What is the purpose of chromatography?

• To measure boiling points

• To separate soluble compounds in a solvent

• To determine the purity of a substance

• To separate solids from liquids

Which of the following is a characteristic of malleable materials?

• They break easily

• They can be hammered into different shapes

• They do not conduct electricity

• They are transparent

What is the main use of a separating funnel?

• To separate soluble solids

• To separate immiscible liquids

• To measure temperature

• To filter liquids

Which method is used to obtain pure water from seawater?

• Centrifugation

• Evaporation

• Sublimation

• Filtration

What does the Rf value in chromatography represent?

• The boiling point of a substance

• The distance moved by the solvent

• The ratio of the distance moved by a substance to the distance moved by the solvent front

• The melting point of a substance

Which of the following is a property of absorbent materials?

• They are good conductors of heat

• They can trap water in their spaces

• They can be easily bent

• They do not allow water to pass through