Pure Substances and Mixtures

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What is an element?

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 compound?

Back

A compound is a pure substance formed when two or more elements are chemically bonded together in a fixed ratio.

Front

Give an example of a mixture.

Back

Air is an example of a mixture, as it contains various gases like nitrogen, oxygen, and carbon dioxide.

Front

Give an example of an element.

Back

Oxygen (O) is an example of an element.

Front

Give an example of a compound.

Back

Water (H2O) is an example of a compound, consisting of two hydrogen atoms and one oxygen atom.

Front

What distinguishes a compound from a mixture?

Back

A compound has a fixed composition and specific properties, while a mixture can vary in composition and retains the properties of its individual components.

Front

How can mixtures be separated?

Back

Mixtures can be separated by physical methods such as filtration, distillation, or chromatography.

Front

What is the difference between homogeneous and heterogeneous mixtures?

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have distinct, separate components (e.g., salad).