Chemistry Essay

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1. History of chemistry Chemistry is a branch of science that has been around for a long time. In fact, chemistry is known to date back to as far as the prehistoric times. Due to the amount of time chemistry takes up on the timeline, the science is split into four general chronological categories. The four categories are: prehistoric times - beginning of the Christian era (black magic), beginning of the Christian era - end of 17th century (alchemy), end of 17th century - mid 19th century (traditional chemistry) and mid-19th century - present (modern chemistry). 2. Definition of chemistry Chemistry is the science that deals with the structure and composition of matter and the chemical reactions that are responsible for changing the state and properties of matter. Chemistry is the science of atoms, molecules, crystals and other aggregates of matter and the chemical processes that change their energy and entropy levels as also their structure and composition. Chemistry has been subdivided into distinct disciplines that deal with specific branches of chemistry. The different branches deal with different aspects of the study of matter. 3. Branches of chemistry Organic Chemistry: deals with the study of the organic matter. The substances that primarily consist of carbon and hydrogen are termed as organic. The discipline that deals with the study of the structure, composition and the chemical properties of organic compounds is known as organic chemistry. This branch also deals with the chemical reactions that are used in the preparation of organic chemical compounds. Inorganic Chemistry: It is the branch of chemistry that relates to the structure, composition and behavior of inorganic compounds. All the substances other than the carbon-hydrogen compounds are classified under the group of inorganic substances. Oxides, sulfides and carbonates form the important classes

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