Please help me explain and clarify the content of Chapter 1, Section 2 of Senior 1 Chemistry Compuls

It's very simple to use the formula.

The quantity of matter is equal to the number of particles of matter divided by Avogadero's constant.

The quantity of a substance is equal to the mass of the substance divided by the molar mass.

The amount of matter is equal to the volume of the gas divided by the molar volume of the gas.

The amount concentration of a substance is equal to the amount of a substance divided by the volume of the solution.

The amount concentration of a substance is equal to 1000, multiplied by the density of the solution, multiplied by the mass fraction, and finally divided by the molar mass.

There are a total of five formulas, and each formula is practiced and applied in multiple formulas after being proficient, which is very important and I hope you can learn it well.

First, the amount of matter = the mass of the substance divided by the molar mass = the number of particles of the substance divided by the Avogadro constant =

The volume of the gas divided by the molar volume = the amount and concentration of the substance multiplied by the volume of the substance [indicating what kind of solution is generally examined, and the volume here refers to the solution, not the solute].

Here are a few more troublesome formulas to you.

1. The mass concentration of the substance = the mass fraction of the substance multiplied by the density of the 1000 substance divided by the molar mass of the solute.

2. The amount of matter = the product of atmospheric pressure multiplied by the volume of gas divided by temperature and a constant (quantitative). [Mostly used for proportional questions].

In fact, you can push these yourself, bring them, of course, 1, 2, you can't push them out.

The quantity of matter is a physical quantity similar to the length and volume, the unit is mol, like a meter is 100 centimeters, 1mol is the set of particles with an Avogadelo constant, which can be said to represent the quantity, and the number of particles of matter is the product of the amount of matter and the Avogadelo constant, in the same way, knowing the number of particles, you should be able to calculate the amount of matter, because the Avogadelo constant is an invariant constant. The mass of a substance is measured in grams and kilograms, and the molar mass is how many grams per mole of the substance is g mol, and the mass is equal to the molar mass multiplied by the amount of the substance, and the concentration of the substance is generally used in the solution, similar to the density, that is, the amount of the substance divided by the volume, the mass fraction needless to say, junior high school. The molar volume of a gas refers to the volume of mol of gas in the standard case, in the standard case, the volume of a mol of gas is a fixed value, and the volume can be multiplied by the amount of matter.

Calculation formula: n=m m c=n v1 n=n na v2=n*vm, depending on the situation. n：

The amount of the substance m: the mass m: the molar mass c:

Quantity concentration of the substance na: Avogadro constant n: number of particles v1:

Volume of solution. vm: gas molar volume (: gas volume (standard condition) chemical formula: the first chapter does not seem to have many chemical formulas written in the book, mainly remember the reaction"Eight Array Diagrams"

Acids and alkalis. Metallic Non-metallic.

Acidic oxides Basic oxides.

I can't draw a specific picture of salt, anyway, I learned it in junior high school, or it is rare, and it is generally okay to distinguish redox reactions. Disproportionation reaction, centering reaction. In fact, it can't be tested, and it is specifically implemented in the reaction.

Why can't this be? In the center is the amount of matter. Just take a good look at the book yourself.

It would be nice to summarize in detail and add some experimental topics.

Seeing a bunch of Shandong tourists around, the flamboyant little vendor improvised and talked about the rhyming Shandong Allegro to attract customers.

Grab n=n na=m m=v vm=cv

During the exam, pay attention to the examination of questions, especially to see the questions clearly (correct or wrong, use the name or chemical formula, etc.), and do not answer the questions that are not asked.

No way.. You're from Mae Chi, right?