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Matter that has exactly the same composition is classified as a pure substances or simply a substance. Every sample of a given substances has the same properties because a substances has a fixed uniform composition. Substances can be classified into tow categories elements and compounds
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoThey are composed of only one substance. For example, calcium is just calcium, there's nothing else. Similarly, sodium chloride, a compound, is just sodium chloride, as long as nothing else is mixed in with it.
Wiki User
∙ 9y agoBecause they have a unique set of chemical and physical properties... When called pure this means that they are different from the other elements for example two elements that are the same would not be named "Pure" while an element that has not match in the Periodic Table would be a "Pure" element
Wiki User
∙ 9y agoThe absolute purity doesn't exist. The denomination pureis only a convention which depends on the applications of a substance. For example - nitric acid:
- a nitric acid semiconductor grade (KMG Cleanroom LP grade) has under 20 ppb iron
- to clean a metallic plate the concentration of iron in HNO3 is not important
Wiki User
∙ 15y agoElements and compounds are pure substances because they both have fixed compositions or uniformed compositions.
Wiki User
∙ 14y agoThey both have fixed compositions or uniformed compositions.
elements
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Is lead in compound or in pure elemental form?
Lead is an element. But both an elements and compounds are pure substances.
What are substances made of?
The fingernails are made of hardened cells of the epidermis, your outer skin layer. The cells have keratinized into a hardened, scalelike covering to protect the tips of your fingers, and the edges help you to pick up small objects.
Explain why elements and compounds are pure substances while a homogeneous mixture is not?
The difference between a homogeneous mixture and a pure substance is that a pure substance has a fixed composition and cannot be separated because it is chemically bonded and a homogeneous mixture can be separated.
When are compounds not considered a pure substance?
As far as the scientific explanation goes something that is pure is free from every type of impurities. Compounds are the mixture of different substances which makes them containing more then one single material.
A pure substance is an example of a homegenous mixture that is very evenly mixed. is that right?
A pure substance and a homogeneous mixture are two different things. A pure substance is anything that is completely by itself. (An element, pretty much) A homogeneous mixture is a mixture of 2+ compounds that you can not differentiate the separate substances in the product. Such as soda, it is all one color and one texture, but there are many compounds in it.
What can pure substances be classified as?
Pure substances are divided into elements and compounds.
Pure substances can be classified as or compounds.?
Elements
What is a name for elements and compounds?
Elements and compounds are pure substances. They also can be molecules.
What are two pure substances?
The two types of pure substance are elements and compounds The two types of pure substance are elements and compounds
Pure substances made from only one type of atom are?
This would be called an element, or a mono-atomic compound.
What 2 catogories of substances include pure substances?
elements and compounds
What are two substances are?
The two types of pure substance are elements and compounds The two types of pure substance are elements and compounds
Which term are use to identify pure substances?
Pure substance can be identified as either elements or compounds. Some examples of pure substance that are elements are sulfur and tin. Pure substances that are compounds are sugar and salt.
What is the word for elements and compounds?
They are called pure substances because they are made 'purely' of one molecule.
Pure substances formed from chemical combinations of two or more different elements are called?
compounds
The two types of pure substances?
elements and compounds (:
What are the two kinds of pure substances?
elements and compounds
