A compound is a substance formed when two or more chemical elements are chemically bonded together. Each molecule of water contains two hydrogen atoms bonded to a single oxygen atom. Example 2: Pure table salt is a compound made from two elements – sodium and chlorine.

barium oxide

A compound is a material composed of two or more components. Water, carbon dioxide and table salt are some examples of compounds.

Compounds Examples

• Water – Formula: H2O = Hydrogen2 + Oxygen.
• Hydrogen Peroxide – Formula: H2O2 = Hydrogen2 + Oxygen2
• Salt – Formula: NaCl = Sodium + Chlorine.
• Baking Soda – Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3
• Octane – Formula: C8H18 = Carbon8 + Hydrogen18

Compound Sentences

• I like coffee. Mary likes tea. → I like coffee, and Mary likes tea.
• Mary went to work. John went to the party. I went home. → Mary went to work, but John went to the party, and I went home.
• Our car broke down. We came last. → Our car broke down; we came last.

1) In chemistry, a compound is a substance that results from a combination of two or more different chemical element s, in such a way that the atom s of the different elements are held together by chemical bonds that are difficult to break. The smallest unbreakable unit of a compound is called a molecule .

There are four types of compounds, depending on how the constituent atoms are held together:

• molecules held together by covalent bonds.
• ionic compounds held together by ionic bonds.
• intermetallic compounds held together by metallic bonds.
• certain complexes held together by coordinate covalent bonds.

A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule. The elements cannot be separated by physical means. Water, for example, is a compound having two hydrogen atoms and one oxygen atom per molecule.

Ammonium thiocyanate

When atoms of different kinds combine to form a compound, a new substance is created. New compounds do not have the same physical or chemical traits of the original elements. They have a new life of their own. Compounds are written with formulas showing which elements from the periodic table are combined.