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The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.
A molecule is an electrically neutral group of at least two atoms held together by covalent chemical bonds.
Slide below shows the methane molecule.
Slide below shows water molecule.
Two atoms of hydrogen and an atom of oxygen combined together form water molecule.
A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions.
Slide below shows the different laws of chemical combination.
The slide below contains the statement of law of conservation of mass.
It states that a given compound always contains exactly the same proportion of elements by weight.
Dalton’s Atomic Theory is shown as below.
It says that atoms can neither be created nor be destroyed.
The International Union of Pure and Applied Chemistry (IUPAC) is an international federation of National Adhering Organizations that represents chemists in individual countries.
The slide below defines the atomic mass.
The slide below shows the atomic mass of carbon and tritium.
The number of atoms constituting a molecule is known as atomicity.
Slide below shows atomicity of some of elements.
Compounds composed of metals and non metals contain charged species. The charged species are known as ions.
Positively charged ions are called as Cations.
Negatively charged ions are called as Anions.
The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.
The slide below shows the definition of mole.
Road map of mole is shown below. It shows how a mole can be expressed in different quantities.
The slide below shows Avogadro’s number.