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 and appearance throughout. Examples include saltwater and air.

Front

Define heterogeneous mixture.

Back

A heterogeneous mixture is a mixture that does not have a uniform composition and can be easily separated into its components. Examples include salad and soil.

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 hydrogen, oxygen, and gold.

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. Examples include water (H2O) and table salt (NaCl).

Front

Is steel a homogeneous or heterogeneous mixture?

Back

Steel is a homogeneous mixture because it has a uniform composition throughout.

Front

Is soil a homogeneous or heterogeneous mixture?

Back

Soil is a heterogeneous mixture because it contains different components that can be distinguished.

Front

Is orange juice with pulp a homogeneous or heterogeneous mixture?

Back

Orange juice with pulp is a heterogeneous mixture because the pulp can be seen and separated from the liquid.

Front

What type of substance is table salt (NaCl)?

Back

Table salt (NaCl) is a compound because it is made up of sodium and chlorine in a fixed ratio.