Is a substance made up of the same molecule necessarily pure?

What is called a pure substance, a substance composed of a single substance, must be composed of the same molecule, the substance only exists in one molecular formula, but not necessarily only one element, can be composed of several elements, such as NaCl, Fe, O2, etc., but O2 O3 does not belong to pure matter.

Yes, because the elementary particles that make up matter are molecules, atoms, ions. A substance composed of molecules, when it is composed of only one molecule, it must be pure, but pure substances are not necessarily composed of molecules, and some are directly composed of atoms, such as metallic mercury is directly composed of mercury atoms; Some are composed of anions and cations, such as sodium chloride, which is composed of sodium ions and chloride ions. Therefore, a substance composed of the same molecule is pure.

Pure matter, on the other hand, is not necessarily made up of the same kind of molecules.

Answer: It is not necessarily pure, there are isomers in organic chemistry, these are the same molecule, but not the same substance.

Right, they are mixtures.

A substance made up of the same molecule is not necessarily pure, and you can give this example very well.

Oxygen and ozone are not the same kind of molecules, as can be seen from the chemical formula, the ozone molecule contains 3 0 atoms and the oxygen molecule contains 2 o atoms.

Therefore, a substance made up of the same molecule must be pure.

Oxygen and ozone are not the same molecules, they're the same atoms.

This sentence is wrong, but the above explanations are not correct, and the error is.

Purity. It is wrong to say that it is made up of the same kind of 'molecules'."

In this "molecule", matter is not only composed of molecules, atoms can also form matter, but individual atoms cannot be called molecules, such as rare gas elements.

But it is only composed of atoms, and correspondingly, its pure composition should also be atoms, some metallic elements.

Elemental matter is also composed of atoms, and the composition of its pure matter is naturally atoms.

Most of the pure liquid gaseous substances, such as dry ice solids, purified water, pure oxygen, sulfur dioxide, etc., and some solid ones such as iron oxide.

Oxygen is made up of oxygen molecules.

and so on

Pure substances are divided into elemental and compound.

Elemental substances are pure substances composed of the same elements.

A compound is a pure substance made up of two or more elements.

The pure substance formed by the same atom must be elemental, and it must not be a compound.

Both deuterium and tritium belong to the hydrogen element. HD is a pure substance composed of the same elements, so it is not a compound.

Certainly, the answer upstairs is wrong that the composition of deuterium and deuterium is not pure. Unless there is another definition of certain compounds, however, it is not encountered in high school.

Not necessarily. For example, hydrogen composed of deuterium atoms and deuterium atoms is still the same. Elemental.

It cannot be said that it is defined as a pure substance that is made up of one substance, as opposed to a mixture.

For example, CO2 gas is the only pure substance, because it is only composed of CO2, a substance, and is composed of a molecule, CO2. However, the basic particles that make up matter are molecules, atoms, and ions, and the substance composed of the same molecule (such as O2) is of course pure, the crystalline silicon composed of atoms is pure, and the sodium chloride (NaCl) composed of anions and cations is also pure.

A: Not exactly.

Analysis:1Purity.

It is divided into compounds and elementals.

2.Pure and saluted potatoes don't have to be made up of molecules. One of the most basic concepts of chemistry in secondary school is that there are three kinds of particles that make up the substance, namely: atoms, molecules, and ions.

3.For example, NaCl is pure, but it only contains ions, not molecules.

Diamond. It's pure, but it contains only atoms, and it doesn't contain molecules.

To sum up, it is accurate to say that a pure substance is a substance that contains only one compound or a limb that contains only one elemental substance.