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Substance (chemistry)

In chemistry, a substance is a unique form of matter with constant chemical composition and characteristic properties. Chemical substances may take the form of a single element or chemical compounds. If two or more chemical substances can be combined without reacting, they may form a chemical mixture. If a mixture is separated to isolate one chemical…

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Overview

Definitions

History

Chemical elements

Chemical compounds

Substances versus mixtures

Chemicals versus chemical substances

Naming and indexing

Isolation, purification, characterization, and identification

Measurement

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Map overview Semantic statistics

Substance (chemistry)

Nodes180
Edges179
Triples14
Avg. degree1.99
Density0.011111
Components1

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Important terminology

chemical substances substance example compounds mixture composition form known mixtures elements chemicals compound one may pure products chemistry atoms oxygen

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
basic copper carbonateinstance ofbecame firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure chemical compounds0.80text
ironinstance ofThese are elements with a characteristic lustre0.80text
copperinstance ofThese are elements with a characteristic lustre0.80text
and goldinstance ofThese are elements with a characteristic lustre0.80text
silicon sometimes resemble metalsinstance ofCertain elements0.80text
sometimes resemble non-metalsinstance ofCertain elements0.80text
and are known as metalloidsinstance ofCertain elements0.80text
melting pointinstance ofsulfide has its own distinct properties0.80text
solubilityinstance ofsulfide has its own distinct properties0.80text
and the two elements cannot be separated using normal mechanical processesinstance ofsulfide has its own distinct properties0.80text
biocidesinstance ofusually with highly optimized continuous processes and to a relatively low price.Fine chemicals are produced at a high cost in small quantities for special low-volume applications0.80text
pharmaceuticalsinstance ofusually with highly optimized continuous processes and to a relatively low price.Fine chemicals are produced at a high cost in small quantities for special low-volume applications0.80text

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