What is chemistry?
Chemistry is the study of matter, its properties and
interactions. Some of the technologies which make use of
chemistry are computer chips, art supplies, medicines,
power plants, plastics, alternative fuels etc.
Branches of chemistry
There are several subdivisions in chemistry. They are organic,
inorganic, physical and analytical. In addition to these four main,
there are biochemistry, environmental, polymer, computational,
organometallic, solid state and many others.
Classification of matter and energy
Matter is anything that has mass and takes up space. Matter can be
classified into pure substances and mixtures. Pure substances are
further classified into elements and compounds. Mixtures can be
homogeneous or heterogeneous. Energy is the ability to do work or
cause changes. Energy is of two types: Kinetic and Potential energy.
Determination of physical or chemical
changes
Physical change is the one in which the chemical structure of the
substances is not changed.
In chemical change, chemical structure of the substances is changed.
There are several signs that may indicate a chemical change has
taken place. Ex: Gas production (bubbling). Physical property is the
property of matter that can be observed or measured without changing
the matter chemically while chemical property describes how a sample
of matter reacts chemically with other matter.
Scientific processes
A hypothesis is an educated guess (prediction) and a theory can
become a law if enough evidence is found. There are common aspects
of scientific experimentation like observations, questions,
hypothesis formation, experimentation, trend recognition, conclusion
formation, communication and validation of results and model
formation.
How to study chemistry
Memorize basic information to save time later. Learn vocabulary
quickly for understanding when it is used later. Take each problem
in steps. Connect each thing u learn with previous concepts. Keep up
with the work � chemistry builds on prior knowledge.
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