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Chemicals are substances that have a definite composition and which can be used as a reactant or catalyst in a chemical reaction. Chemicals can be naturally occurring, such as water and carbon dioxide, or they can be man-made, such as plastics.

Chemicals are often classified by their physical properties and the type of reaction they participate in. For example, acids are reactive substances with sour taste that turn blue litmus paper red.Chemicals are classified into three different categories: organic, inorganic, and biological. Organic chemicals include hydrocarbons such as petroleum, coal tar derivatives, and vegetable oils; inorganic chemicals include metal oxides such as titanium oxide; biological chemicals are made up of amino acids and proteins. Chemicals have a variety of uses from being used for cleaning to being used for the production of pharmaceuticals.

Chemicals are substances that have properties that can be used for a variety of purposes. These are generally organic or inorganic compounds. Chemicals can be used for industrial, commercial, agricultural, and other purposes.

Chemical compounds are usually composed of two or more different elements or molecules with different chemical properties. This is because the chemical bonds between them are weaker than the bonds within them. They are also classified based on their properties and how they react with one another and other chemicals in a given environment.

Chemicals are substances that can change the properties of other substances. They are often made from organic materials, such as petroleum, coal, and natural gas. Chemicals can be used to make plastics, fertilizers, medicines, and pesticides.

Chemicals have many different uses in the world today. They are used in everything from construction to agriculture to manufacturing. Some chemicals are also used as fuels or for energy production.

Some common types of chemicals include:

-pesticides

-medicines

-plastics

-fertilizers