Classification of Matter

Front

What is a pure substance?

Back

A pure substance has a permanent composition and cannot be separated into other substances by physical means.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that can be separated by physical means and does not have a fixed composition.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

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

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

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

Front

Give an example of a pure substance.

Back

Examples of pure substances include water (H2O) and oxygen (O2).

Front

Give an example of a mixture.

Back

Examples of mixtures include air (a mixture of gases) and salad (a mixture of various vegetables).

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl.

Front

What is the main component of natural gas?

Back

The main component of natural gas is methane (CH4).

Front

Is blood a pure substance or a mixture?

Back

Blood is a mixture because it can be physically separated into plasma, red blood cells, and white blood cells.