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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.
What else can I help you with?
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.
Can pure substances be mixtures?
No, pure substances cannot be mixtures. A pure substance is made up of only one type of atom or molecule, with uniform properties throughout the sample. Mixtures, on the other hand, are composed of two or more different substances physically combined, each retaining its individual properties.
Is sulphur a mixture or a pure substance?
Sulfur is an element. Elements are not mixtures.
Is a cereal a pure substance or a mixture?
it is a mixture
Is neon a pure substance or mixture?
Neon is a pure substance. Elements and compounds are pure substances; mixtures are not.
Is cheese is substances or mixtures?
Cheese is a pure substance
What are the branches of matter?
The two main branches are pure substances and mixtures.
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.
Is a cheese sandwish a pure substance or mixture?
Foods are mixtures.
Can pure substances be mixtures?
No, pure substances cannot be mixtures. A pure substance is made up of only one type of atom or molecule, with uniform properties throughout the sample. Mixtures, on the other hand, are composed of two or more different substances physically combined, each retaining its individual properties.
What do mixtures and pure substances have in common?
Mixtures and pure substances are both made up of different types of matter. However, mixtures contain two or more substances physically combined, while pure substances contain only one type of substance with a specific composition.
What are the 2 categories of substance?
The 2 categories are 'pure substances' or '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 sulphur a pure substance or a mixture?
Sulfur is an element. Elements are not mixtures.
