Separating mixtures (including formulations) | Exit Quiz | Oak National Academy

Match the following terms with their correct definitions.

• mixture

• To extract and isolate a substance from a mixture.

• separate

• A designed mixture with specific purpose for each component.

• property

• A material with two or more different substances physically combined.

• formulation

• A feature or characteristic of a substance.

Answer explanation

'Mixture' refers to a physical combination of substances, 'separate' is the process of isolation, 'formulation' is a designed mixture, and 'property' is a characteristic of a substance.

Which of these is a true statement about mixtures?

• Mixtures have fixed melting points.

• Components in a mixture lose their original properties.

• Mixtures can be separated by physical methods.

• Mixtures are substances with uniform composition.

• Each component in a mixture forms new chemical bonds.

Answer explanation

Unlike compounds, the components in a mixture retain their original properties and can be separated physically.

The melting point data of a substance can help distinguish a pure substance from a...

Answer explanation

Pure substances have specific melting points, while mixtures have varying melting points due to the presence of multiple components.

Which of the following is NOT a correct use of the term 'pure' in scientific context?

• pure water

• pure carbon dioxide

• pure air

• pure gold

Answer explanation

In scientific terms, 'pure' refers to a single substance, while air is a mixture of various gases.

Order the following steps used in separating a mixture. Start by identifying the components.

• Collection of the separate components.

• Determining the best separation method.

• Identification of the components.

• Applying a physical separation method.

Answer explanation

First, identify the components, then choose the appropriate separation method, apply the method, and finally collect the separate components.

In a mixture, the chemical ___ of each substance remains unchanged.

Answer explanation

In a mixture, each substance retains its own chemical properties, unlike in a chemical reaction where properties change.