What is Pure chemistry?
Before we go to the subject matter there is need to understand Chemistry as:
1. (Chemistry) the branch of physical science concerned with the composition,
2.
(Chemistry) the composition, properties, and reactions of a particular
substance
3. The
nature and effects of any complex phenomenon: the chemistry of humour.
4. Informal, a reaction, taken to be instinctual, between two persons.
Pure
Chemistry is simply the study of the facts and theories of chemistry in their
purely scientific relations, without necessary reference to their practical
applications or mere utility.
For Example; studying The modern theory of matter dates from the work of John Dalton at the beginning
of the 19th century.
The atom is considered the basic unit of any element, and
atoms may combine chemically to form molecules, the molecule being the smallest
unit of any substance that possesses the properties of that substance.
An
element in modern theory is any substance all of whose atoms are the same
(i.e., have the same atomic number),
while a compound is composed of different
types of elements together in molecules.
Physical and
Chemical Changes
The
difference between a mixture and a compound helps to illustrate the difference
between a physical change and a chemical change.
Different atoms may also be present
together in a mixture, but in a mixture, they are not bound together chemically
as they are in a compound.
In physical change, it involves a change of state of matter (e.g., from solid to liquid), the substance as a whole changes, but its
underlying structure remains the same; water is still composed of molecules
containing two hydrogen atoms and one oxygen atom whether it is in the form of
ice, liquid water, or steam.
In a chemical change, however, the substance
participates in a chemical reaction, with a consequent reordering of its atoms.
As a result, it becomes a different substance with a different set of
properties.
Many of the
physical properties and much of the behavior of matter can be understood
without detailed assumptions about the structure of atoms and molecules.
For
example, the kinetic-molecular theory of gases provides a good explanation of
the nature of temperature and the basis of the various gas laws and also gives
insight into the different states of matter.
Substances in different states vary
in the strength of the forces between their molecules, with intermolecular
forces being strongest in solids and weakest in gases.
The force holding like
molecules together is called cohesion, while that between unlike molecules is
called adhesion.
Among the phenomena resulting from
intermolecular forces are surface tension and capillarity.
An even larger
number of aspects of matter can be understood when the nature and structure of
the atom are taken into account.
The quantum theory has provided the key to
understanding the atom, and most basic problems relating to the atom have been
solved.
The
Relationship of Matter and Energy
The atomic
theory of matter does not answer the question of the basic nature of matter. It
is now known that matter and energy are intimately related.
According to the
law of mass-energy equivalence, developed by Albert Einstein as part of his
theory of relativity, a quantity of matter of mass m possesses an intrinsic
rest mass energy E given by E= mc 2, where c is the speed of light. This
equivalence is dramatically demonstrated in the phenomena of nuclear fission
and fusion in which a small amount of matter is
converted to a rather large amount of energy.
The converse reaction, the
conversion of energy to matter, has been observed frequently in the creation of
many new elementary particles.
The study of elementary particles has not solved
the question of the nature of matter but only shifted it to a smaller scale.
As you can see from this article there is no instance where the theory of matter was applied any practical experiment, in other words this is how pure chemistry is done
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