Separating an insoluble solid from a liquid | Starter Quiz | Oak National Academy

Which substances are insoluble (do not dissolve) in water?

• sugar

• sand

• rubber

• salt

Answer explanation

Sand and rubber cannot dissolve in water. Sugar and salt can dissolve.

A ___ is a material that contains two or more different substances, which can be physically separated.

Answer explanation

A mixture is a material that contains two or more different substances, which can be physically separated.

What mixture is formed when a substance dissolves in a liquid?

• solution

• insoluble

• soluble

• solar

Answer explanation

A solution is formed when a soluble substance (solute) dissolves in a liquid (solvent). This is a mixture.

Match the following words to their meaning.

• Separate

• A substance which can dissolve in a liquid.

• Equipment

• To divide something into its different parts.

• Soluble

• A substance which cannot dissolve in a liquid.

• Insoluble

• Items needed to perform a task.

Answer explanation

A soluble substance is one which can dissolve in a liquid. An insoluble substance is one which cannot. When you separate something you divide it into its different parts. Equipment is used to perform a task.

Iron is a ___ material as it is attracted to magnets.

Answer explanation

Iron is a magnetic material which can be attracted to magnets. Other magnetic metallic substances are steel, cobalt and nickel.

Which of the following are mixtures?

• orange juice

• oxygen

• air

• table salt

• carbon

Answer explanation

Orange squash and air are mixtures that contain two or more different substances. Oxygen, table salt and carbon are pure substances made up of only one type of chemical.