Sorry, my mistake, i wanted to say the word "chemicals"

A chemical substance is a form of matter that has a constant chemical composition and characteristic properties. 

Chemical substances can be simple substances (substances consisting of a single chemical element), chemical compounds, or alloys. 

A chemical substance may exist in different states, such as solids, liquids, gases, or plasma, and may change between these phases of matter with changes in temperature or pressure and time. 

Chemical substances may be combined or converted to others by means of chemical reactions.
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