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A pure substance is completely homogeneous, meaning that it has the exact same structure throughout the sample. It has a constant chemical composition throughout the entire sample, and cannot be separated into two or more different substances through any physical or mechanical methods because it is composed completely of one type of molecule. If one were to split a pure substance in two, both pieces would behave similarly*.
A cookie is not like this. It is composed of many different kinds of molecules that have vastly differing structures. For example, nearly all cookies have both water and sugar in them. Water's chemical formula (H2O) is very different than a common sugar's chemical formula (glucose, C6H12O6). Cookies are not uniformly composed of a specific sequence or structure, so they cannot be a pure substance.
*This is not entirely true due to quantum effects that are prominent in very small particles (normally on the nano scale) but works well for bulk materials.
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∙ 14y ago
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Can pure substances be mixtures?
No. This is because a pure substance is a compound (or element) and can only be separated chemically but mixtures can be separated physically. P.S. This answer was written by a 14 year old from Dearborn Michigan
Is cheese is substances or mixtures?
Cheese is a pure substance
Is medicine pure substance?
Drugs may be pure substances but more frequently they are mixtures.
Is a cereal a pure substance or a mixture?
it is a mixture
Is sulphur a mixture or a pure substance?
Sulfur is an element. Elements are not mixtures.
Is neon a pure substance or mixture?
Neon is a pure substance. Elements and compounds are pure substances; mixtures are not.
Can pure substances be mixtures?
No. This is because a pure substance is a compound (or element) and can only be separated chemically but mixtures can be separated physically. P.S. This answer was written by a 14 year old from Dearborn Michigan
Are melted crayons a mixture or a pure substance?
They are mixtures.
Is cheese is substances or mixtures?
Cheese is a pure substance
Is hydrogen gas a mixtures?
Not by itself, its a pure substance.
What do mixtures and pure substances have in common?
They are made up of atoms or groups of atoms.
What are the branches of matter?
The two main branches are pure substances and mixtures.
Is a cheese sandwish a pure substance or mixture?
Foods are mixtures.
Why these pure substances come up into mixtures?
we will mix if the pure substance come up
Is matter a pure substance and a mixture?
yes matter can be both pure substances and mixtures
Is medicine pure substance?
Drugs may be pure substances but more frequently they are mixtures.
What are the 2 categories of substance?
The 2 categories are 'pure substances' or 'mixtures'
