The difference between chemical element, compound, oxide, mixture, and pure substance.

Pure: composed of a constituent with a unique definite chemical formula; This includes both elemental and chemical compounds.

Mixture: Composed of 2 or more components, such as air, seawater, etc.

Elemental: A pure substance composed of the same element, such as O2, O3, etc.

Compounds: pure substances composed of more than one element; Including acids, alkalis, salts, oxides, etc.

Oxide: A compound composed of the element oxygen and another element, such as CO2, SO2, H2O, etc.

Pure substances are divided into 1: elemental and 2: compounds. Consists of one substance.

Elemental substance refers to a pure substance containing only one element, such as oxygen O2 and ozone O3; A compound is one that contains two or more pure substances.

Oxide refers to a compound that is made up of two elements, one of which is oxygen.

A mixture consists of two or more substances.

First of all, a substance that is composed of one substance is called a pure substance, while a mixture is a substance composed of two or more substances.

Elemental matter and compound are both pure, while elemental matter is made up of the same element, and compound is composed of different elements. Oxide is a type of compound that is composed of two elements, one of which is a compound of oxygen, such as CO2, MGO

Compounds, more than one element. Oxides, oxygenated compounds. Mixtures, 2 or more substances. Purifiers, elemental or compounds.

Oxides should contain only two elements, one of which is oxygen, such as acetic acid, which contains oxygen, but cannot be said to be oxide.

Mixture: two substances or more substances.

Compound: A substance composed of atoms of two or more elements (referring to atomic species of different elements). It refers to a pure substance (different from an element) produced from a chemical reaction

Elemental: It is a pure substance composed of the same element. The mixture cannot be elemental. The presence of an element in a elemental substance is called the free state of the element.

Oxide: A compound composed of two elements. One of these elements is oxygen. It varies according to the chemical properties. Oxides can be divided into two categories: acidic oxides and basic oxides.

It is made from a mixture of various substances. The mixture does not have a fixed chemical formula, and has fixed physical and chemical properties. Example:

Oxygen, nitrogen, potassium chlorate, etc. are all pure substances. A compound is a pure substance consisting of two or more elements. Example:

Water and sodium chloride must be pure substances composed of the same elements, and the mixture cannot be elemental. Example: Metal:

Aluminum (Al), Iron (Fe), Calcium (Ca), Potassium (K), Mercury (Hg) Non-metals: Oxygen (O), Sulfur (S), Silicon (Si), Phosphorus (P), Iodine (I), Hydrogen (H), Nitrogen (N) Noble gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), Xenon (XE), Radon (RN).

The first distinction is between mixtures and pure substances, which are single substances, such as oxygen, hydrogen, sodium, and iron, without impurities (but there is no absolute purity in the world, and the highest purity is only, and the purity mentioned here is in an ideal state); A mixture is a mixture of several pure substances, such as air (a mixture of nitrogen, oxygen, carbon dioxide and other gases), and all solutions are mixtures, chlorine water.

The second is that pure substances are divided into elemental substances and compounds: elemental substances are substances composed of only one element, such as oxygen (composed of only element O), liquid chlorine (refers to chlorine in a liquid state); Compounds are made up of a variety of elements, such as CO2 (which is made up of two elements, C and O).

Elemental: There is only one element and this element makes up only one molecule or substance. Example: oxygen, ice-water mixture.

Purity: It is the addition of elemental substances to compounds.

Mixture: There can be one or more elements that make up two or more different molecules or substances. Examples: oxygen and ozone (O2, O3), water and carbon dioxide.

Compound: Two or more elements make up a molecule.

Example: Carbon dioxide.

Elemental: a pure substance composed of the same element, such as Cu, Ag, Fe and other metal elements, you can understand it as a single substance, Pure substance: A substance composed of the same substance is called a pure substance, which is divided into a single substance and a compound (the element is in the pure substance), such as some gases, nitrogen, oxygen, it contains one substance, no other, mixture:

A mixture of multiple substances, easy to understand, compounds: substances composed of concentrated elements, substances synthesized by chemical reactions of two or more elements, such as H2O, NaCl, etc

If it can be expressed by chemical formula, the mixture is excluded (ice water mixture is a pure substance) What can be expressed by chemical formula is a pure substance, a compound is composed of two or more different elements, that is, a chemical substance, and a single substance is composed of an element, such as H2

Elemental: a substance composed of one element; Such as H2, Fe, C, Cl2, etc.

Compounds: substances composed of two or more elements; Such as H2O, HCL, H2SO4, NaCl, C2H5OH, etc.

Pure: Composed of one substance; Pure substances are made up of elemental substances and compounds.

Mixture: composed of two or more substances; Such as hydrochloric acid (composed of HCL and H2O), air (composed of O2, N2, CO2, AR, etc.).

Oxide: The product of a substance that reacts with oxygen or reacts to obtain electrons.

Organics: Organics usually refer to carbon-containing compounds, or hydrocarbons and their derivatives are collectively referred to as organics, but do not contain a few such as CO, CO2, H2CO3, etc.

Acid refers to compounds in which all cations produced during ionization are hydrogen ions;

Base refers to a compound in which all the anions produced during ionization are hydroxide ions;

Salts are compounds that ionize to form metal cations (or NH4) and acid ions.

Acids, alkalis, and salts are important knowledge points in chemistry learning.

Good luck with your studies!

Mixture: A mixture is made up of a mixture of two or more substances.

Pure: is made up of a substance.

Elemental: A pure substance composed of the same element is called elemental.

Compounds: Pure substances made up of different elements are called compounds.

Oxide: In a compound made up of two elements, if one of them is oxygen, this compound is called an oxide.

Acids: Compounds that are ionized when ionized and all cations are hydrogen ions are called acids.

Base: A compound in which all anions are hydroxide ions produced during ionization are called bases.

Salts: Compounds that produce metal ions and acid ions when ionized are called salts.

Basic oxides, acidic oxides.

Any oxide that can react with acid to form salts and water is called an alkaline oxide. For example, copper oxide, calcium oxide, and magnesium oxide are all basic oxides. Metal oxides are mostly basic oxides.

Any oxide that can react with alkali to form salt and water is called an acidic oxide. For example, carbon dioxide, sulfur trioxide, etc. Most of the non-metal oxides are acidic oxides.

Organics: Organics usually refer to carbon-containing compounds, or hydrocarbons and their derivatives are collectively referred to as organics, but do not contain a few such as CO, CO2, H2CO3, etc.

There are 2 classes of substances. 1 is a bai mixture. One is pure.

Mixture: From.

Substances that are composed of 2 or more substances are mixtures. (The genus simply means that a substance in which two or more molecules are present in a substance is a mixture.) Purifiers can be divided into elemental and compounds.

Elemental: A substance composed of one element of the same kind (must be one component) Compound: A substance composed of multiple elements of the same kind (2 or more components) The concept of elementality on the 1st floor is wrong.

Substances composed of oxygen O2 and ozone O3 are also mixtures. And they are an element.

Oxide: It is composed of two elements, one of which is oxygen, which is called oxide. Note that it must be 2 elements.

Organics: Carbon-containing compounds (except carbon, carbonic acid, carbonates, carbon oxides), mostly containing elements such as C, H, O, N.

Acid-base salts: salts that are acidic or alkaline in aqueous solutions.

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.

A compound composed of two elements, one of which is oxygen, is called oxide. Oxides must be oxygenated compounds, but oxygenates are not necessarily oxides.

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.

A pure substance is an object that contains only one substance;

A mixture refers to an object that contains a number of different substances;

Elemental refers to substances that contain only one element;

Oxides are substances that contain only two different elements, one of which is oxygen;

A compound is a substance that contains no less than two different kinds of elements, and this question seems to be in a book, and if you want to learn chemistry well, I recommend that you read the book carefully.

Substances are divided into pure substances and mixtures, pure substances are divided into elemental substances, compounds, compounds are divided into oxides, and so on.

To tell you my trick, it's actually based on the concept:

Pure substance: Anything that can be expressed by chemical formula is pure. (e.g. water H2O, calcium carbonate.)

caco3。。）

Mixture: What cannot be expressed by chemical formula is a mixture, as opposed to a pure substance. (e.g. lime water, beverages, purified water.) ）

Elemental: Pure matter is divided into elemental substance, which is a pure substance composed of only one element. (e.g. oxygen O2, hydrogen H2.) ）

Compounds: Pure substances are also divided into compounds, which are pure substances composed of two or more types. (Example: water H2O, phosphorus pentoxide.)

p2o5。。）

Oxide: Also a type of pure substance, a substance composed of two elements, which contains the element oxygen.