How chemistry distinguishes between pure substances, elemental substances, mixtures, and oxides. Tha

Pure matter is simply composed of one substance. It can be atomic, molecular. For example, dry ice, liquid nitrogen, copper, iron.

Elemental: It is composed of only one element, such as oxygen O2, ozone O3 (only one element symbol);

Compounds: those that are composed of two or more elements, carbon dioxide CO2, SO2, sulfur dioxide (more than one element symbol);

Oxide is a type of chemical compound, but it is absolutely only composed of oxygen and one other element, CO2, SO2, but more than three elements of oxygenated elements, it is not oxide. Here you can also see that oxides are also pure.

A mixture is made up of two or more substances (a pure substance), such as air (nitrogen N2, oxygen O2, etc. in the air).

I guess that's detailed enough.

Pure: Contains only one substance or one molecule.

Mixture: Contains more than two substances or molecules.

Elemental: A pure substance containing only one element.

Oxide: A compound containing two elements, one of which is oxygen.

Purified: ice, potassium permanganate, liquid oxygen, copper oxide, potassium chloride, magnesium.

Mixture: river water, unpolluted air.

Elemental: liquid oxygen, magnesium.

Compounds: potassium permanganate, copper oxide, potassium chloride.

Oxide: Copper oxide.

Salt: potassium permanganate, potassium chloride.

Pure substance: The key to a pure and clean substance is a single one.

Elemental: It is made up of only one element and must be pure.

Mixture: As long as there are two or more substances, it is a mixture.

Oxide: Contains only two elements, and one of them is oxygen, and it must be pure.

Frequently asked questions: What is a substance that contains only one element?

There is a possibility that there is an isotopic composition of the same element, and in the end it can only be a mixture, because it is a different substance.

Let's look at the definition first: a substance composed of a single substance is called a pure substance, including: pure substances include elemental substances and compounds.

Characteristics: The composition is fixed, with fixed physical and chemical properties.

For example, oxygen, nitrogen, potassium chlorate, etc. are all pure substances.

Note: If a pure substance contains an isotope of an element (e.g. "water" has both H2O and D2O in it), it is still pure.

Classification: (1) Compounds: Pure substances containing different substances.

Such as: carbon dioxide, iron oxide, potassium permanganate.

2) Elemental: A pure substance composed of the same elements.

Such as: hydrogen, nitrogen, oxygen.

River water, mixtures, various bacteria, etc.

Ice, pure, contains only one substance.

Potassium permanganate, pure, if it is a solution is a mixture.

Liquid oxygen, elemental, is also pure.

Copper oxide, oxide, is also pure.

Unpolluted air, mixture.

Potassium chloride, purified.

Magnesium , elemental, pure.

There is only one element in element, a compound is a substance formed by two or more elements, an oxide is a compound formed by an element and oxygen, a pure substance is only one substance, and a mixture is of course a variety of substances.

There is only one element; For example, CA substance in which a compound consists of two or more elements, such as H2OOxides, obviously, compounds containing oxygens and only two elements (including oxygen) such as cao

Pure substances: elemental substances, compounds, and oxides are collectively referred to as pure substances. Mixture:

Consists of two or more substances. Don't get confused.

A compound is a pure substance made up of a variety of elements. Pure matter is made up of only one substance. The mixture is made up of a variety of substances, and oxides are made up of two substances, one of which is oxygen.

Elemental substances are pure substances composed of the same elements.

A substance is made up of a pure substance (all the components that can be expressed by a chemical formula), and a mixture that contains more than one substance.

If there is only one element in a pure substance, it is elemental, and if it contains more than one element, it is a compound, if it contains only two elements, and one is oxygen, it is an oxide.

Mixtures are juxtaposed with pure substances, which include elemental substances and compounds, and compounds include oxides and oxygenated compounds.

Mixture and pure substance: whether the chemical equation can be written, and what can be written is pure substance.

On the premise of being identified as pure, it distinguishes between elemental substances and compounds: elemental substances are composed of one element (e.g., Fe, Ar, O2), and compounds are composed of multiple elements (e.g., HCl, KmNO4).

Distinguish between oxides and oxygenates in the case of confirmed compounds: oxides are composed of two elements (H2O2, H2O), and oxygenates are composed of three or more elements (KMNO4, KCLO3).

Supplement upstairs: elemental, compound, oxide refers to the composition of a certain substance, is a broad concept, is a definition; Pure substances, mixtures are the state of existence. As for oxides, the specific estimate is in the sense that they can cause oxidation reactions of other substances.