Separation technique

Which apparatus is most suitable for measuring 25.0 cm³ of a solution accurately?

• Measuring cylinder
• Burette
• Pipette
• Gas syringe

Answer explanation

A pipette is the most accurate for measuring 25.0 mL of solution. It's designed for precise volume measurements in this range.

What is the best method to separate a mixture of sand and salt?

• Filtration
• Distillation
• Crystallization
• Filtration followed by evaporation

Answer explanation

Filtration separates sand from the salt solution, then evaporation of the filtrate leaves pure salt.

Which separation technique is shown in the image?

• Distillation
• Filtration
• Crystallization
• Fractional distillation

Answer explanation

The image shows a fractional distillation setup, used to separate liquids with different boiling points.

In paper chromatography, what does the distance traveled by a component depend on?

• Its color
• Its solubility in the solvent
• Its mass
• Its volume

Answer explanation

The distance traveled by a component in paper chromatography depends on its solubility in the mobile phase (solvent).

Which method is best for separating two miscible liquids with different boiling points?

• Filtration
• Distillation
• Crystallization
• Chromatography

Answer explanation

Distillation is the best method for separating miscible liquids with different boiling points.

Which apparatus would you use to measure 50.0 cm³ of gas accurately?

• Measuring cylinder
• Burette
• Pipette
• Gas syringe

Answer explanation

A gas syringe is designed to accurately measure volumes of gases.

What information can you deduce from a substance's melting point?

• Its color
• Its purity
• Its mass
• Its volume

Answer explanation

The melting point can indicate a substance's purity. Pure substances have sharp melting points, while impurities cause a range of melting temperatures.

Which separation method is best for a mixture of iron filings and sulfur powder?

• Filtration
• Distillation
• Magnetic separation
• Chromatography

Answer explanation

Iron is magnetic, so magnetic separation can easily separate iron filings from sulfur powder.

What type of mixture is best separated by fractional distillation?

• Solid-solid
• Solid-liquid
• Liquid-liquid (immiscible)
• Liquid-liquid (miscible)

Answer explanation

Fractional distillation is ideal for separating miscible liquids with different boiling points.

Identify the apparatus shown in the image.

• Burette
• Pipette
• Measuring cylinder
• Gas syringe

Answer explanation

The image shows a burette, which is used for precise dispensing of liquids in titrations.