Question

which cannot be chemically broken down into simpler substances? compound element solution mixture

Explanation:

• A compound is made of two or more elements chemically combined and can be broken down into simpler substances (elements) by chemical means.
• An element is a pure substance that consists of only one type of atom and cannot be broken down into simpler substances by chemical reactions.
• A solution is a homogeneous mixture and can be separated into its components (solute and solvent) by physical means (like evaporation, distillation), and also, the components can be further broken down chemically if they are compounds.
• A mixture is a combination of two or more substances (elements or compounds) that are not chemically combined and can be separated into simpler substances by physical means, and the components can be broken down chemically if they are compounds or elements (but elements themselves can't be broken down chemically).

Answer:

B. element