Pure Substances vs 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 different elements are chemically bonded together.

Front

What is a molecule?

Back

A molecule is formed when two or more atoms bond together, which can be of the same or different elements.

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 a non-uniform composition (e.g., salad).

Front

Can a mixture be a pure substance?

Back

No, a mixture is not a pure substance. A pure substance is either an element or a compound.

Front

What is a solution?

Back

A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent), such as sugar in water.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; it remains constant.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition (e.g., melting ice).