Elements Molecules and Mixture Review 2024

A molecule is a group of two or more atoms bonded together. It can be made up of the same or different types of atoms.

A compound is a substance formed when two or more different elements are chemically bonded together.

Ozone (O₃) is a molecule, but it is not a compound because it consists of only one type of element.

A molecule of water (H₂O) contains 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

The subscript in a chemical formula indicates the number of atoms of the element present in the molecule.

There are 2 oxygen atoms in carbon dioxide (CO₂).

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Yes, a molecule can be both a compound and a molecule if it consists of two or more different elements.

There are 2 carbon atoms in the compound C₂H₂.

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.