Distinguish mixtures of compounds, elementals, oxides. Purity

Elemental refers to a pure substance that is made up of one element.

Oxide is a pure substance composed of two elements, one of which is oxygen.

A compound is a pure substance that is made up of a variety of elements.

Compounds include oxides.

The gas left after burning the charcoal in a gas collection cylinder (filled with air) Is this CO?

If there is a small amount of oxygen, it is a mixture of CO and CO2.

If there is an excess of oxygen, it is CO2

Those who can write chemical formulas are pure.

The solutions are all mixtures.

Mixtures, purities are distinguished macroscopically.

Mixture, that is, a variety of items mixed together, such as tea, there is water and tea leaves, is a mixture.

A pure substance is a single item, such as water or tea, that is separated separately and is pure.

Elemental, compound, oxide are microscopically distinguished.

Elemental, a substance with only one element, such as single carbon, is a substance with only carbon atoms, and like pure oxygen, it is composed of only oxygen molecules. Substances that consist of the same structure, atoms, or molecules of only one element are elemental.

A compound is a substance composed of atoms or molecules of different substances, or it can be a substance composed of different structures of the same atom or molecule.

Oxides are easy to separate, first of all, they should contain oxygen, and then they are compounds, and such substances are oxides.

To quickly distinguish, it is necessary to first determine the mixture or pure substance from the macro and microscopic levels, and then further determine whether it is composed of the same element, the composition of different elements is a compound, the compound containing oxygen is an oxide, if it is composed of different structures of the same substance, it is still a compound, otherwise it is a elemental substance.

Mixture: seawater, gas left over after burning charcoal in a gas collection cylinder (containing air), clarified lime water, hydrogen peroxide solution, mineral water, clean and fresh air, heating potassium permanganate to the residue after complete decomposition.

Elemental: helium, liquid oxygen, white phosphorus, mercury.

Oxides: water vapor, ice-water mixture, ferric tetroxide, sulfur dioxide.

Compounds: water vapor, ice-water mixture, ferric tetroxide, sulfur dioxide.

Purities: elemental, oxide, compounds.

The difference between a mixture and a pure substance is to see if there is only one substance, such as mineral water, there are some metal ions such as water and iron ions, and there are many substances, so it is a mixture. (It is a kind of substance!) ）

Elemental compounds, on the other hand, are pure, and the difference between them is the number of types of elements. Elemental substances have only one element, and compounds have two or more elements. (It is a kind of element!) ）

Oxide is one that contains two elements, one of which is oxygen.

Ferric oxide is a ferrite, that is, ferrous metaferrite Fe(FeO2)2, in Fe3O4, iron shows two valences, one iron atom shows +2 valence, and two iron atoms in metaferrite show +3 valence, so ferric tetroxide can be regarded as a compound composed of FeO and Fe2O3, which can be expressed as FeO·Fe2O3, and cannot be said to be a mixture of FeO and Fe2O3, it belongs to pure substances.

This guy is very right, however, I don't understand one thing, ferric oxide, which can be seen as composed of two parts FeO and one part Fe2O3, is this considered a mixture?

It should be classified as such.

1. Pure substance: There is only one substance composition, or it is understood as such, as long as there is a chemical formula to represent this substance, then this substance is pure, such as potassium permanganate, potassium chlorate, water (H2O).

1) Compound: A compound is a substance composed of two or more elements, but the premise is that the substance must be pure. For example, sodium hydroxide, copper oxide, sodium chloride, potassium chlorate.

2) Oxide: Oxide is composed of two elements, one of which is oxygen, and the premise is that it must be pure, and oxide is also a compound. For example, the examples of the compounds just given are copper oxide, ferric tetroxide, phosphorus pentoxide.

3) Elemental: There is a substance composed of elements, provided that it is pure, and the valency of the elemental substance is zero, for example, hydrogen, oxygen, nitrogen. (Note: Noble gases are not marked with submark 2.) Like liquid oxygen, liquid nitrogen, in fact, it is oxygen and nitrogen. ）

Second, the mixture: the mixture is easy to say, it is just the opposite of pure matter, there are a variety of substances, such as air, or a substance with the word solution after the name is also a mixture, but note that the ice-water mixture is not a mixture, but a pure substance.

Here's what I'm serious about:

Substances are divided into pure substances and mixtures.

Pure substances are further divided into elemental substances and compounds.

Compounds are further divided into oxides, salts, bases, and acids.

A pure substance is a substance that contains only one element, and vice versa, a mixture.

Oxide refers to a substance that contains two elements, one of which is oxygen.

A pure substance composed of the same element is called a simple substance (a substance composed of one element is not necessarily a elemental substance, it may be a mixture, but it must not be a compound.) ）

A substance made up of one molecule must be pure, and a pure substance is not necessarily made of one molecule.

A pure substance composed of different elements must be a chemical compound; A substance that is made up of different elements is not necessarily a compound, but a compound must be made up of different elements.

The difference between a pure substance and a mixture is the difference in the type of substance.

The difference between elemental and compound is that the type of element is different.

If you want to learn chemistry well, you should definitely read more books, this is experience, and the consequences of not reading books are miserable.

So you want to + oil!

There are two pairs of relative concepts that need to be contrasted to memorize.

1. Elemental substances and compounds. Elemental matter is a pure substance composed of only one element. For example, diamond C, oxygen O2, iron Fe, etc.

A chemical compound, a pure substance consisting of two or more elements. For example, table salt NaCl, water H2O, etc.

2. Mixtures and purifiers. Pure matter, which is composed of only one substance. For example, table salt, NaCl, oxygen, O2, etc.

A mixture, consisting of two or more substances. For example: salt water, NaCl H2O, air O2, CO2, N2, etc.

It should be noted that if there is a mixture of different substances composed of the same element, it is not a pure substance, but only a mixture. For example, diamond and graphite are both composed of carbon, but because the structure is different, they are different substances, and they are mixed just a mixture. Water and ice, on the other hand, are both H2O but different in form, so ice water is pure.

3. Oxide, composed of two elements, one of which is a pure substance of oxygen. In other words, oxygen is made up of one other element. Such as water H20, hydrogen peroxide H2O2, carbon dioxide CO2, copper oxide Cuo, etc.

For specific distinctions, the following steps can be followed:

First of all, it can be written that the chemical formula of a single substance is pure, otherwise it is a mixture;

Then, if there is only one element in the chemical formula, it is elemental, and if it is two or more, it is a compound;

Finally, if one of the elements of a compound containing only two elements is oxygen, it is an oxide.

The following is an explanation of the terms compounds and elements, purities and mixtures, oxides, etc

Compounds and elementals: Elemental substances are molecules or atoms made up of an element itself (e.g. oxygen and ozone, if mixed together, they are not elemental, but mixtures); Compounds are pure substances formed by redox reactions of different elements.

Pure substances and mixtures: as long as they are not pure substances (pure substances are substances composed of one substance, with fixed composition, fixed physical and chemical properties, with special chemical symbols, can be expressed by a chemical formula), it is a mixture (a mixture is a substance formed by a mixture of two or more substances).

Oxides: Oxides are chemical compounds (which must also be pure, of course). It contains only two elements, one of which must be oxygen, and if the other is a metal element, it is called a metal oxide; If the other element is not a metallic element, it is called a non-metallic oxide.

How to distinguish between elemental compounds and pure mixtures of oxidesAnswer: Pure substances refer to substances made up of only one substance. A mixture is composed of two or more substances. The microscopic composition of these two concepts is that the former is a molecule, and the latter refers to two or more molecules.

Elemental refers to a pure substance composed of the same elements. A compound is a pure substance made up of different elements.

Oxide refers to a compound that is made up of the element oxygen and another element.

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Purity: Purity refers to a polymer that consists of a single element or a chemical compound.

2. The nature is different.

Elemental: Elemental matter cannot undergo decomposition reaction.

Compounds: Compounds can undergo decomposition reactions.

Mixture: The mixture has no fixed properties, such as no fixed melting and boiling points.

Pure substance: Pure substance has fixed properties, such as a certain fixed melting and boiling point.

Only one substance is pure, and there are multiple substances that are mixtures. Only one element is pure, and a pure substance composed of multiple elements is a compound. If one of the two elements is oxygen, then this compound is an oxide.

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.

Pure: composed of only one substance, such as water H2O (ice-water mixture is also pure);

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

I don't know if LZ understands

Elemental matter is made up of one element.

Compounds are made up of a variety of elements.

Oxide is a type of compound that has two elements, one of which is the oxygen element, which is composed of one substance.

Mixtures are made up of a variety of substances.

In layman's terms, a mixture is composed of multiple substances, and he cannot write it in a single chemical formula. For example, concrete is made of sand, lime and water;

Pure substances, as opposed to mixtures, are composed of only one substance. As long as it is not a mixture, it must be pure;

Compounds are a class of pure substances, and their chemical composition is composed of a variety of elements, such as water, which is composed of two elements, hydrogen and oxygen;

Elemental substances are different from compounds, and their chemical formula is that there is an element composition, such as oxygen, and only oxygen;

Oxide is also a chemical compound that is made up of other elements and the element oxygen, such as calcium oxide.

The mixture is made up of a variety of substances and cannot be represented by chemical symbols, for example: vinegar, wine.

Pure matter is made up of a substance that can be represented by chemical symbols, such as pure water.

There are explanations in the textbook, you have to read more and understand it.

Elemental: Pure spike produced by the same elemental group.

Quality, called elemental. For example: O2N2Fe

Compounds: Pure substances composed of different elements, called compounds. For example: nacih2okmno4

KCIO3 oxide: Consists of two elements, one of which is oxygen.

The compound is called oxide guess filial piety. H2ocoSO2 pure substance: a substance composed of the same substance, called pure substance. It is a element, a compound, and a pure substance.

Mixture: A substance composed of different substances, called a mixture. Such as air, sugar water and so on.

A+B rolls.

Pure: Composed of the same substance.

Mixture: Composed of different substances.

Elemental: A pure substance composed of the same kind of element.

Compounds: Pure substances composed of different elements.

Oxide: Consists of two elements, one of which is a compound of the element oxygen.

What is a pure substance, a mixture, an element, a compound, an oxide A pure substance is a substance composed of the same substance. It includes both elemental and compound compounds. If it is a element, it must be pure, and if it is a compound, it must be pure.

Difference Between Elemental and Compound:

Elemental matter is a pure substance composed of the same element. Such as: O2, H2, N2, Fe, Cu helium, neon and so on. A substance that contains only one element, but must be pure.

Chemicals and substances: pure substances composed of different elements. For example: h2oai2o3

HCIH2SO4, sodium chloride, phosphorus pentoxide, ferric tetroxide, copper oxide, potassium chlorate, etc.

Compounds are further divided into oxides, acids, bases, and salts.

Oxide: must be composed of two elements and be a compound. For example: h2oai2o3

HCI are both oxides, which are also compounds and are pure.