Define Substance....??
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A substance is a matter that has definite properties and composition. Every pure compound and element is a substance.
Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Every pure substance is homogeneous. Pure substances can be divided into two categories – elements and compounds.
- Elements are made up of the same types of atoms. Example gold and silver.
- Compounds are made up of different types of atoms joined together by chemical bonds. An example is carbon dioxide.
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Substance of nerve tissue:
physical material from which something is made or which has discrete existence the substance of nerve tissue.
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