How to learn chemistry well, chemistry calculations are good or bad

You can start with basic techniques, such as calculating correlations with chemical equations and chemical coefficients. Then you can use the ion equation, the relation, ......In the end, the most arrogant thing is that after practicing to a certain level, you can use the electron conservation method and the relationship between valence and rise and fall to perform oral calculations. Keep practicing, about a month or so. I experienced it myself, but I was a bit stupid and used it for 5 weeks.

And I think the most important thing is to write the chemical formula, which is the most basic.

1. Chemistry. Chemistry textbook is a teaching book that systematically expounds the content of the textbook according to the syllabus, and if you grasp the textbook, you will grasp the basic knowledge, and you should focus on the main principles, laws, and important conclusions and laws in the textbook. At the same time, we should also pay attention to the methods of learning research problems in chemistry, and mastering the scientific method of learning is more important than mastering knowledge.

Because it improves the thinking ability of learning.

The procedure of reading a chemistry book is generally a three-step process.

1 Comprehensive Reading A comprehensive look at a textbook, grasp the overall content of a book, form a preliminary overall impression in your mind, and be able to outline and describe the key, difficult, key and essential issues in the textbook.

2 Grasp the key On the basis of a comprehensive view, grasp the key points, difficulties and key terms in the teaching materials, and carefully ponder them repeatedly.

3 Rational thinking: When reading books, we should think positively, master key knowledge, and gradually break through the difficult and combing knowledge.

In short, the procedure of reading a book can be summarized as: "the whole jujube part of the jujube whole", that is, the whole perception, the part of the exploration, the whole understanding.

Whether it's math, chemistry or physics, these are not subjects that can be learned well by rote memorization. The most important thing is to master the method and find the rules!

First of all, the exercise of thinking ability is very important. Flexible thinking skills allow you to find and introduce the corresponding knowledge points when looking at the problem, and at the same time, especially in mathematics, there are often many entry points for a good slow staring problem.

We know that the questions are never finished, and a slight change from one question becomes another. But if we can find its essence and understand and learn the theme, then we can find a solution to it no matter how it changes!

This is fractional calculation in mathematics.

The so-called cross multiplication, the second equation:

x=2*30/24=

Proportional solution.

1.Product of inner term = product of outer term.

For example: 65 30 = 2 y

30*2=65y (the unary equation should be solved) 2Look at it as a fraction and cross-multiply.

Such as: 24 2

30 x 24x = 2 x 30 (similar).

65/30 == 2/y

65：30=2：y

65y=30*2

24/30 == 2/x

24:30=2:x

24x=30*2

The inner term is multiplied by the inner term, and the outer term is multiplied by the outer term.

y=30*2/65 x=30*2/24

In fact, it is the same as solving an equation, first writing the relative mass of the substance, multiplying it by the stoichiometric number, and then solving the mathematical equation.

If you look carefully at the formula in the textbook, the ratio of volume multiplied by concentration is equal to the ratio of stoichiometric numbers, and it is possible that the amount of substance used here is actually a meaning.

There are many types of chemical calculation problems, such as excess calculations (judging reactants and products), calculations about mixtures, calculations about range discussions, or calculations about the determination of complex chemical formulas.

Let's talk about the content of the chapters of "Ionization Equilibrium" and "Chemical Equilibrium", most of the calculation questions revolve around the law of conservation of ions, protons, and charges. Here due to time constraints, I will talk about the calculation of the range:

Solution: 1Write equations and find the perfect point. That is, write the equation of the chemical reaction that may occur due to the difference in the relative content of the reactants, and calculate and find out the special point of the reaction between the two separately.

2.Determine the scope, calculate the judgment. That is, based on the characteristics of the exact complete reaction, the cases that are greater than, less than, or equal to are discussed, so as to find the corresponding intervals.

Determine the different ranges, and then discuss the speculation and judgment excess in different ranges, so as to find out the calculation basis, determine the calculation relationship, and get the answer!