Elements, Compounds, and Mixtures

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H), oxygen (O), and gold (Au).

A compound is a substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

A mixture is a combination of two or more substances that are not chemically bonded. Examples include air and salad.

A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

The chemical formula for sugar is C12H22O11.

HCl, NaCl, and CO2 are compounds; Cl is an element.

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

A heterogeneous mixture is a mixture where the components are not uniformly distributed, such as a salad.

No, elements cannot be broken down into simpler substances by chemical means.

A chemical formula represents the elements in a compound and the ratio of atoms, providing essential information about its composition.