Molecules of carbon, oxygen, hydrogen and water

Molecules of carbon, oxygen, hydrogen and water

ZIMSEC O Level Combined Science Notes: Molecules

  • A molecule is the smallest particle of a compound formed when atoms of elements combines
  • The atoms combine together by forming bonds
  • When these bonds are formed there are energy changes
  • Typically heat energy is given out when the bonds are formed
  • While elements contain only one type of an atom
  • Compounds contain two/more different types of atoms
  • All matter is composed of elements or compounds
  • For example Carbon dioxide is a compound of oxygen and carbon
  • Each molecule contains one atom of carbon and two atoms of oxygen
  • Water is also a compound made up of water molecules
  • Each water molecule is made up of one atom of oxygen and two atoms of hydrogen
  • Some elements are also made up of molecules
  • For example an oxygen atom combines with another to form oxygen molecules
  • Hydrogen molecules are made up of two hydrogen atoms

To access more topics go to the Combined Science Notes page.

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