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. Examples include elements and compounds.

Front

What is a mixture?

Back

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

Front

Define homogeneous mixture.

Back

A homogeneous mixture is a mixture that has a uniform composition throughout. Examples include saltwater and air.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture where the components are not uniform and can be easily distinguished. Examples include salad and dirt.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen and gold.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in a fixed ratio. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is the difference between a compound and a mixture?

Back

A compound is a chemical combination of elements with a fixed ratio, while a mixture is a physical combination of substances that can vary in composition.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is maple syrup, where the components are evenly distributed.

Front

What is 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

How can you identify a compound in a mixture?

Back

A compound can be identified in a mixture by its consistent composition and properties, which differ from the individual components.