A pure substance made up of molecules does not necessarily contain only one molecule

Purity. are chemical compounds, so mere atoms cannot make up a pure substance. As long as it's not a mixture and it's a compound, then it's pure. Therefore there can be more than one molecular composition.

Atoms and ions of the same element have the same number of nuclear charges.

It is indeed because the number of protons is the same. Because the number of protons of the same kind of atom or ion is equal to the number of nuclear charges.

Hehe, in fact, chemistry also has rules to follow, and you will always learn it well if you take your time.

1) A pure substance made up of molecules does not necessarily contain only one molecule. Isotopes are taken into account here. In the case of pure oxygen, all molecules may have oxygen atoms made up of oxygen 16, but there may also be molecules made up of oxygen 18 atoms.

It's your bucket of oxygen that is still pure, but the molecules are different.

2) That's right, the number of nuclear charges is equal to the number of protons.

This sentence is correct, for example, hydrogen is a pure substance, it may contain three molecules, hydrogen molecules, heavy hydrogen molecules, and super heavy hydrogen molecules, which are still pure.

Atoms can make up pure substances, such as pure metals are made up of corresponding atoms.

Ions are formed by gaining and losing electrons on the basis of atoms, and the number of protons in their nucleus does not change, and the number of nuclear charges is the same.

The chemistry teacher said:

Two or more elemental substances constitute a pure substance.

Atoms are the smallest particles that make up matter! Carbon is made up of two carbon atoms!

The number of electrons outside the nucleus is equal to the number of nuclear charges.

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.

Molecule : Chemically, a molecule is the name of a basic unit of matter that is composed.

i.e. one of the basic units of matter is the molecule.

Pure substance: The substance wheel sensitizer composed of the same substance is called pure substance, which is divided into elemental substances and compounds.

That is, a substance that contains only one substance is pure.

Although the particles that make up matter are molecules, atoms, and ions.

However, for a substance composed of one atom, there is not necessarily only one (e.g. oxygen and ozone, diamond and graphite, and ......).Note: The changes between allotropes are chemical changes).

Ions can generally only make up compounds (i.e., they are made up of two elements) - it is impossible to say that a substance made up of one atom or ion is pure.

But we can say that a substance that is made up of only one molecule is pure.

Because a molecule can only be a substance.

It is right that a substance consisting of only one molecule is pure.

But pure matter is made up of only one molecule, so it's not very accurate.

If a bottle of NaCl crystals is not a molecule, NaCl is an ionic crystal--- but it is still pure, after all, the requirement of a pure substance is to contain only one substance, and it does not necessarily require that the substance is made of molecules).

It's a bit of a ...... to talk about itUnderstand for yourself.

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

1。Oxygen, water, nitrogen, carbon dioxide, sulfur dioxide.

2.All kinds of metal elemental, noble gas elemental.

3.Water gas (hydrogen and carbon monoxide), a variety of solutions formed by dissolving a pure substance in water.

4。Pig iron (iron and carbon), a mixture of two noble gas elements.

3.Carbohydrates 4alloys, such as zinc-copper alloys.

1. Carbon dioxide gas.

2. Graphite. 3. Carbon dioxide and oxygen are mixed.

4. Graphite and silicon elemental mixing.

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.