What is a pure substance that cannot be broken down by chemical means?

What is a pure substance that cannot be broken down by chemical means?

• A. Compound
• B. Element
• C. Mixture
• D. Ion

Answer: (B)

A pure substance that cannot be broken down by chemical means is defined as an element. Elements are fundamental substances that consist of one type of atom and are represented on the periodic table. They cannot be decomposed into simpler substances by chemical reactions, which distinguishes them from compounds, which are made up of two or more different elements bonded together and can be broken down into those constituent elements through chemical processes. Mixtures, on the other hand, contain two or more substances physically combined and can be separated by physical means; they do not represent pure substances. Ions, while charged particles that can be part of compounds or elements, are not pure substances themselves but rather representations of atoms or molecules that have gained or lost electrons. Thus, only elements fit the criterion of being pure substances that cannot be chemically broken down.

A pure substance that cannot be broken down by chemical means is defined as an element. Elements are fundamental substances that consist of one type of atom and are represented on the periodic table. They cannot be decomposed into simpler substances by chemical reactions, which distinguishes them from compounds, which are made up of two or more different elements bonded together and can be broken down into those constituent elements through chemical processes.

Mixtures, on the other hand, contain two or more substances physically combined and can be separated by physical means; they do not represent pure substances. Ions, while charged particles that can be part of compounds or elements, are not pure substances themselves but rather representations of atoms or molecules that have gained or lost electrons. Thus, only elements fit the criterion of being pure substances that cannot be chemically broken down.