Chemstry Review

Sara is at the beach and notices that the ocean water is salty. She wonders why salt water is considered a mixture rather than a pure compound. What is the primary reason for this classification?

• It consists of salt physically dissolved in water.

• It is a new liquid compound with a fixed formula.

• It can only be separated by a chemical reaction.

• It is found in large oceans across the world.

Which statement best explains why filtration is an effective method for separating an insoluble solid from a liquid?

• The solid particles are too large to pass through the pores of the filter paper.

• The liquid is evaporated by heating, leaving the solid behind.

• The solid and the liquid have different boiling points.

• The solid is magnetic while the liquid is not.

The correct statement describes the filtration of muddy water is ....

• Water passes through filter paper and is called residue.

• Water is retained on filter paper and is called filtrate.

• Mud is retained on filter paper and is called filtrate.

• Water passes while mud is retained on filter paper.

Which apparatus is used to show the presence of illegal coloring agents in a fruit drink?

• Apparatus with funnel and filter paper

• Apparatus with heating setup

• Apparatus with chromatography paper in a tube

• Apparatus with separating funnel

A magnet can help to differentiate ....

• steel and plastic

• sand and gravel

• mercury and water

• nickel and copper

A mixture contains methanol and ethanol. They have different boiling points. Which method could be used to separate this mixture?

• Filtration

• Simple distillation

• Crystallisation

• Evaporation

The picture shows how muddy water can be purified. Which process for purifying the muddy water is shown?

• Crystallisation

• Distillation

• Filtration

• Solvent extraction

Solid particles which are left on filter paper while filtration is called ....

• filtrate

• residue

• solute

• solvent

A scientist has a mixture of sand, sugar, and water in a container. What sequence of methods would be best to separate the sand and then extract the sugar from the solution?

• Filtration, followed by crystallization.

• Crystallization, followed by filtration.

• Evaporation, followed by distillation.

• Distillation, followed by evaporation.

A student is investigating a coloured mixture using chromatography. Where should he place the coloured mixture?

• in the solvent

• just above the pencil line

• just below the pencil line

• on the pencil line