10.1.1 - Separation techniques

What is a mixture?

• A combination of substances that are chemically joined.

• A combination of different substances that are not chemically joined.

• A substance formed by the chemical union of two or more elements.

• A pure substance with a definite composition.

Which of the following is an example of a compound?

• Air

• Seawater

• Magnesium oxide

• Most rocks

How can you separate iron from a mixture of iron and sulfur?

• Using a magnet

• By dissolving in water

• Using a chemical reaction

• By heating the mixture

What is a key difference between mixtures and compounds?

• Mixtures have a definite composition.

• Compounds can be separated by physical means.

• Mixtures are not chemically bonded together.

• Compounds retain the properties of their elements.

Which statement is true about iron sulfide?

• It is a mixture of iron and sulfur.

• It can be separated into iron and sulfur using a magnet.

• It has different properties from both iron and sulfur.

• It contains more iron than sulfur.

What is the process of separating a mixture of sand and salt?

• Filtration followed by evaporation

• Using a magnet

• Distillation

• Chromatography

Which of the following is a characteristic of a homogeneous mixture?

• It has a uniform composition throughout.

• It can be easily separated by physical means.

• It is always a liquid.

• It consists of visibly different substances.

Which of the following is a property of a compound?

• It can be separated into its components by physical means.

• It has a fixed ratio of elements.

• It is always a mixture of gases.

• It retains the properties of its individual elements.

Which technique is used to separate a soluble solid from a liquid?

• Filtration

• Evaporation

• Magnetic separation

• Decantation

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation