Relative atomic mass and mixture of compounds, after adding 5 points

The relative atomic mass is the relative mass of the atom, that is, the mass of a carbon atom (a carbon atom with 6 protons and 6 neutrons in the nucleus, which can be simply represented by 12C) is taken as a standard, and the actual mass of other atoms is compared with it, and the value obtained is the relative atomic mass of the atom. This is more convenient, and there are many integers.

A mixture is a mixture of two or more substances that do not react with each other, and each substance in the mixture retains its original properties.

A compound is a pure substance composed of different elements, and the compound has a fixed composition and has certain properties. Compounds can be divided into two categories: organic and inorganic in terms of composition, and can be divided into two categories: ionic compounds and covalent compounds from the chemical bonds that make up the compounds.

Pure matter is made up of one substance. The substance that makes up a pure substance can only be one substance. The substances that make up the mixture can be two or more, and the number of substances is not fixed.

The property of a certain number of atoms of an element being combined with a certain number of other elements is called the valency of an element. It is an important property of the element, and determining the valency of the element is a basic skill that junior high school students should master.

Relative atomic mass: Taking the mass of a carbon atom as a criterion of 1 12, the mass of other atoms is the relative atomic mass of this atom.

There are a lot of compounds and elements in the mixture, and so on, and in short, there's a lot of stuff in it.

A compound is simply a thing.

The property of a certain number of atoms of an element that is combined with a certain number of atoms of other elements is called the valency of this element.

Since the ratio of a and b to the atomic masses is 8:9, let their molar masses be 8x and 9x respectively, according to the amount of matter 3:

2 (let the amount of matter be 3y, 2y respectively) in the mixture of grams containing a is 8x 3y = 24xy (g), containing b is 9x 2y = 18xy (g), it can be seen that 24xy + 18xy = , xy = .

According to the amount of the substance 3:2 and dilute sulfuric acid reaction to produce as much hydrogen, it means that the ratio of valency is 2:3, and the total loss of electrons is 3y 2 + 2y 3 = 12y (mo).

The amount of hydrogen (under the standard condition) of the substance is = Mo), and the electrons = Mo) are obtained, then 12y = , y = .

In this way, we can know that x = = 3, 8x = 24, 9x = 27, and the two metals are: a:mg, b:al.

These two kinds of metals are mg and al, and you can borrow them from the topic.