Pure substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is a type of matter that has a uniform and definite composition. It can be an element or a compound.

Front

How is an element defined in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

What distinguishes a homogeneous mixture from a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition.

Front

Can you give an example of a homogeneous mixture?

Back

Coffee with milk and sugar is a good example of a homogeneous mixture.

Front

What is a compound?

Back

A compound is a substance formed when two or more different types of atoms chemically bond together.

Front

How is salt classified in terms of matter?

Back

Salt is classified as a compound because it is made of sodium and chlorine atoms that are chemically bonded.

Front

What is the difference between a pure substance and a mixture?

Back

A pure substance has a constant composition and distinct properties, while a mixture consists of two or more substances that can vary in composition.

Front

What happens to the properties of substances in a mixture?

Back

In a mixture, the individual substances retain their own properties and can be separated by physical means.

Front

What is an example of a pure substance?

Back

Aluminum foil is an example of a pure substance, as it is made of only aluminum atoms.