Quiz on Mixtures and Solutions

What is a pure substance?

• A substance that scatters light

• A substance that cannot be separated by physical processes

• A substance with multiple types of particles

• A substance with the same type of particles

How can a homogeneous mixture be defined?

• A mixture with visible particles

• A mixture with non-uniform composition

• A mixture with the same characteristic properties

• A mixture that can be separated by filtration

What is the Tyndall effect?

• The evaporation of volatile components

• The scattering of light by colloidal particles

• The settling of particles in a suspension

• The separation of cream from milk

How can immiscible liquids be separated?

• By evaporation

• By sublimation

• By filtration

• By centrifugation

What is the purpose of sublimation in separating mixtures?

• To separate immiscible liquids

• To separate volatile components from non-sublimable impurities

• To separate homogeneous mixtures

• To separate cream from milk

Which separation techniques will you apply for the separation of sodium chloride from its solution in water?

• Evaporation

• Chromatography

• Distillation

• Filtration

Explain the following giving examples: (a) saturated solution

• A compound composed of two or more elements

• A solution with maximum solute dissolved at a given temperature

• A mixture with visible particles suspended in a liquid

• A homogeneous mixture of two or more substances

Classify each of the following as a homogeneous or heterogeneous mixture: soda water, wood, air, soil, vinegar, filtered tea.

• Soda water - Homogeneous, Wood - Heterogeneous, Air - Heterogeneous, Soil - Homogeneous, Vinegar - Homogeneous, Filtered tea - Heterogeneous

• Soda water - Heterogeneous, Wood - Homogeneous, Air - Homogeneous, Soil - Heterogeneous, Vinegar - Homogeneous, Filtered tea - Homogeneous

• Soda water - Homogeneous, Wood - Heterogeneous, Air - Homogeneous, Soil - Heterogeneous, Vinegar - Heterogeneous, Filtered tea - Homogeneous

• Soda water - Homogeneous, Wood - Heterogeneous, Air - Homogeneous, Soil - Heterogeneous, Vinegar - Homogeneous, Filtered tea - Homogeneous

How would you confirm that a colourless liquid given to you is pure water?

• Test the boiling point

• Check for any visible particles

• Test the pH level

• Test for electrical conductivity

Which of the following materials fall in the category of a 'pure substance'?

• Silver, Coal, Methane

• Ice, Milk, Iron

• Hydrochloric acid, Calcium oxide, Mercury

• Brick, Wood, Air