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What is a chemical pure substance? Give an example.

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oce0999 | Student, Grade 9 | eNotes Newbie

Posted September 26, 2008 at 5:55 AM via web

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What is a chemical pure substance? Give an example.

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sullymonster | College Teacher | (Level 1) Educator Emeritus

Posted September 28, 2008 at 1:43 AM (Answer #1)

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A sample of matter, either an element or a compound, that consists of only one component with definite physical and chemical properties and a definite composition.  To put it more simply, a pure substance is one is predictably arranged and can not be broken off into separate substances.  For example. water, or H2O.  The formation of water is a combination of the elements hydrogen and oxygen in a predictable pattern.  If you break off parts of that pattern, you remain with only elements -  hydrogen and oxygen.  You can't break the two elements off and form a new substance.  Think of pure substances in the same way that you think of lowest common denominator in math.

All pure substances can be further separated by asking this question "Can the sample be further decomposed by chemical means?"   Like with the water example, can you break it off into parts.  With water, you can - it is broken into hydrogen and oxygen.  Therefore, this pure substance is a compound.  If the substance can not be broken into parts - like hydrogen by itself - than the pure substance is an element.

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Yojana_Thapa | Student, Grade 10 | Valedictorian

Posted January 25, 2014 at 10:22 PM (Answer #2)

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Matter is Pure substance or Mixtures. Pure Substance is an element or compounds!

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parama9000 | Student, Grade 11 | Valedictorian

Posted January 26, 2014 at 2:14 PM (Answer #3)

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A pure substance can only be broken using chemical methods not physical methods. For example, hydrogen is a pure substance, and since it is by itself, it cannot be broken and is also considered a pure substance.

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atyourservice | Student, Grade 10 | Valedictorian

Posted July 28, 2014 at 7:25 AM (Answer #4)

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A pure substance is a material that consists of one type of building block of matter. 

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