PowerPoint Presentation Wave Mechanics

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Definition of Chemistry
The object of chemistry is to obtain a knowledge
of the intimate nature of bodies, and of their
mutual action on each other.
--Jane Marcet Conversations on
Chemistry Hartford Oliver D.Cooke and Co. 1826
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Definition of Chemistry
Chemistry is the branch of science that examines
the elements and their compounds experimentally,
and investigates the laws the regulate their
combination.

• -Elroy M. Avery, Phd. The Complete Chemistry
  
• New York Sheldon and Company 1881
  

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A Modern Definition

• Chemistry is the study of matter and the
  changes that it undergoes.

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Matter Anything that takes up space and has mass
Substance A form of matter with a definite
composition and distinct properties
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Classification of Matter
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Pure Substances
An element is a substance made up of one kind of
atom. It cannot be separated into simpler
substances by ordinary chemical means
An atom is the smallest particle of an element
that still retains the properties of that element.
A compound is a substance composed of two or more
elements chemically combined to form a new
substance.
A molecule is the smallest particle of compound
that still retains the properties of that
compound..
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Mixtures
A mixture is a combination of two or more pure
substances in which the substances retain their
separate identities.
A heterogeneous mixture is simply called a mixture
A homogeneous mixture is given the special name
solution
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Physical Separation Filtration

• Filtration will separate heterogeneous mixtures
  only.
• Example Silver chloride (AgCl) and water
• Solutions can not be separated by filtration.

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Physical Separation Simple Distillation
Can be used to separate solutions