Pure Substances and Mixtures Flashcard

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 where each substance retains its own properties. Mixtures can be homogeneous or heterogeneous.

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout, and the individual components are not distinguishable.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture in which the composition is not uniform, and the individual components can be seen and separated.

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

What is the difference between a compound and a mixture?

Back

A compound has a fixed composition and properties that are different from its constituent elements, while a mixture retains the properties of its individual components.

Front

Give an example of a homogeneous mixture.

Back

An example of a homogeneous mixture is saltwater, where the salt is completely dissolved in water.

Front

Give an example of a heterogeneous mixture.

Back

An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.