Atoms & Molecules

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Atom

The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons.

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Atom
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Molecule

A molecule is an electrically neutral group of at least two atoms held together by covalent chemical bonds.

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Molecule
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Methane Molecule

Slide below shows the methane molecule.

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Methane Molecule
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Water Molecule

Slide below shows water molecule.

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Water Molecule
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Water Molecule

Two atoms of hydrogen and an atom of oxygen combined together form water molecule.

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Water Molecule
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Compound

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.

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Compound
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Laws of Chemical Combination

Slide below shows the different laws of chemical combination.

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Laws of Chemical Combination
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Law of Conservation of Mass

The slide below contains the statement of law of conservation of mass.

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Law of Conservation of Mass
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Law of Definite Proportions

It states that a given compound always contains exactly the same proportion of elements by weight.

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Law of Definite Proportions
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Dalton’s Atomic Theory

Dalton’s Atomic Theory is shown as below.

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Dalton’s Atomic Theory
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Dalton’s Atomic Theory

It says that atoms can neither be created nor be destroyed.

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Dalton’s Atomic Theory
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IUPAC

The International Union of Pure and Applied Chemistry (IUPAC) is an international federation of National Adhering Organizations that represents chemists in individual countries.

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IUPAC
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Atomic Mass

The slide below defines the atomic mass.

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Atomic Mass
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Atomic Mass

The slide below shows the atomic mass of carbon and tritium.

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Atomic Mass
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Atomicity

The number of atoms constituting a molecule is known as atomicity.

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Atomicity
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Atomicity

Slide below shows atomicity of some of elements.

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Atomicity
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Ion

Compounds composed of metals and non metals contain charged species. The charged species are known as ions.

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Ion
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Cation

Positively charged ions are called as Cations.

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Cation
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Anion

Negatively charged ions are called as Anions.

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Anion
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Molecular Mass

The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance.

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Molecular Mass
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Mole

The slide below shows the definition of mole.

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Mole
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Mole

Road map of mole is shown below. It shows how a mole can be expressed in different quantities.

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Mole
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Avogadro’s number

The slide below shows Avogadro’s number.

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Avogadro’s number
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