Molecule:
* Definition: A molecule is formed when two or more atoms bond together, regardless of whether they are the same or different elements.
* Examples:
* Oxygen (O2): Two oxygen atoms bonded together.
* Water (H2O): Two hydrogen atoms and one oxygen atom bonded together.
* Nitrogen (N2): Two nitrogen atoms bonded together.
Compound:
* Definition: A compound is a molecule that is formed from two or more different elements.
* Examples:
* Water (H2O): A compound made from hydrogen and oxygen.
* Carbon dioxide (CO2): A compound made from carbon and oxygen.
* Sodium chloride (NaCl): A compound made from sodium and chlorine.
Key Differences:
* Element diversity: Compounds must contain at least two different elements, while molecules can be made of the same element (e.g., O2).
* Properties: Compounds have unique properties different from the elements that make them up. For example, water is a liquid at room temperature, while hydrogen and oxygen are gases.
In Summary:
* All compounds are molecules, but not all molecules are compounds.
* Molecules represent any group of bonded atoms.
* Compounds represent molecules with at least two different types of atoms.
Think of it this way: a molecule is like a family, and a compound is like a family with members from different ethnicities. All families are groups of people, but only families with members from different backgrounds are multi-ethnic.
