Define molecule as it relates to molecular substances and compounds.

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1. A molecule is defined as the smallest unit of a chemical substance that retains its chemical properties and is composed of two or more atoms bonded together.
2. Molecules can consist of atoms of the same element (e.g., O₂ for oxygen gas) or different elements (e.g., H₂O for water).
3. Molecular substances are composed of molecules held together by covalent bonds, which involve the sharing of electrons between atoms.
4. Compounds are a specific type of molecule that consist of two or more different elements chemically combined in fixed proportions (e.g., CO₂ for carbon dioxide).
5. In summary, molecules are the building blocks of molecular substances and compounds, with compounds being a subset of molecules that include multiple types of elements.

Key Concepts

Molecule

A molecule is the smallest unit of a chemical substance that retains its chemical properties. It consists of two or more atoms bonded together, which can be of the same or different elements. Molecules can exist independently and are the building blocks of molecular substances and compounds.

Molecular Substances

Molecular substances are composed of molecules formed by covalent bonds between atoms. These substances typically have low melting and boiling points and can exist in various states (solid, liquid, gas) at room temperature. Examples include water (H2O) and carbon dioxide (CO2), which illustrate the diversity of molecular substances.

Compounds

Compounds are substances formed when two or more different elements chemically bond together in fixed proportions. They can be molecular, consisting of molecules, or ionic, consisting of ions. Compounds exhibit unique properties that differ from the individual elements that compose them, such as sodium chloride (NaCl), which is a compound formed from sodium and chlorine.