The French chemist Joseph Prast first came up with the concept of a chemical in the 18th century after experimenting with and working on chemicals,

including copper carbonate. Chemical elements can combine with each other during a chemical reaction to form countless chemicals.

For example, water is the result of the reaction of the elements hydrogen and oxygen

In this case, two hydrogen atoms and one oxygen atom combine to form a molecule with the chemical formula H2O.

These two elements under different conditions can form another substance called hydrogen peroxide (oxygenated water) which has H2O2 molecules.

Definition of chemicals

Chemicals are substances that have a fixed chemical composition and properties.

The components of chemicals can not be identified using physical separation methods without decomposing the elements and determining their percentage composition.

Chemicals are in the form of chemical compounds, chemical elements, ions or alloys.

In nature, chemicals that can be found in pure form are very rare.

Some of these chemicals are diamonds, gold, sodium chloride and sugar (sucrose).

Chemicals are generally available in four forms: solid, liquid, gas, or plasma.

A chemical may be found under the influence of changes in pressure and temperature in each of these cases.

Chemicals are classified into industrial and laboratory chemicals according to the type of application.

Also, chemicals are generally divided into two major groups of minerals and organic matter

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