Physicochemistry is good. How to quickly improve your score effectively append .

I'm a high school student, and I'm almost 4 months later on the college entrance examination, I'm not good at physics, I'm tackling this now, if you want to say how physics can get on, then I tell you that only when you fully or most of the understanding of physics scenarios, then I think physics is not very difficult for you, but it depends on how you understand, as for chemistry, I think you should consolidate the basics, especially the chemical equations in the books, my teacher said the same, remember not to engage in sea tactics so that only make the brain become rigidNumbness! I hope you make some progress and get the good results you hope for, don't be too suspicious of whether you can pass the test, be happy!

It is not impossible to improve your grades in a short period of time, physical chemistry is a science thing, and you really need to use your brain. Questions need to be done. However, when you take the exam, many knowledge points remain the same, and they are very similar to important example questions, so you must be proficient in the example questions.

In physics, the formula must be memorized, and if the formula is right, half of the points will be scored. I really don't have any ideas, so I mess around with formulas, and the one that can be calculated is right. Chemical equations are important and need to be memorized.

Well, looking back on the junior high school study and current teaching experience, in fact, it is simple to say that there are 3 points:

Look at it every day, review it from time to time, and don't forget the knowledge points that have been returned.

Do more questions, be familiar with the question types, and accumulate experience in doing questions.

Prepare a notebook of mistakes, synthesize the previous mistakes, take the time to redo them, and if necessary, analyze the causes of the mistakes, and "pick up" the missing knowledge points again.

The landlord should also review comprehensively, although physics and chemistry are very important, but they should still be seen, after all, the high school entrance examination is a comprehensive exam.

My junior high school physics and chemistry are basically the first in the class, because junior high school physics and chemistry are one, junior high school physics and chemistry are very dependent on memory, to improve these two courses in the short term, you must take the physical chemistry book every day to memorize ah, I have a classmate two months of hard memorization plus doing questions to strengthen, the high school entrance examination two exams more than 70 and more than 80, amazing, you need to work hard, no matter what the result is, you will not regret it.

Yes? Like me, I'm not good at physics and chemistry, and everything else is good, but my physics and chemistry grades have gone up, and I do a good job of the homework assigned by the teacher, which is the workbook, and then buy exercises outside, but I must understand it. I'm about to take the high school entrance exam, come on!

Read the textbook a few more times and go through the questions you got wrong before.

I think the knowledge in the book is very, very important, first of all, you have to memorize it all, and then you have to do n many, n many questions, and you should be able to do it very skillfully and well.

1) From the comparison of the third part and the fourth part, we know that the mass of the barium chloride solution is increased, and the mass of the precipitate generated at this time no longer increases, for, it can be known that the sodium sulfate has been completely reacted at this time, then according to the equation: Na2SO4 + BACl2=BaSO4 + 2NaCl, the mass of the precipitated barium sulfate can be calculated by the mass ratio of the precipitated barium sulfate 142g m=233g, and the mass of sodium sulfate in each part is solved m =

So the mass fraction of sodium sulfate is = note that the solid is divided into four equal parts, so the mass of sodium sulfate in the mixture is multiplied by 4).

2) In the same way, compared with the first and second parts, the mass of barium sulfate produced after increasing the mass of barium chloride increases, so it can be introduced that after adding 15g of barium chloride to the first part, the sodium sulfate is not completed and the barium chloride reaction is complete, then the mass of barium chloride can also be calculated according to Na2SO4 + BACl2=BaSO4 +2NaCl, and the mass of barium sulfate generated at this time: 208g m = 233g

The mass of barium chloride is m=

So the mass fraction of barium chloride is =

The mass fraction of sodium sulfate in the original mixture is:

The mass fraction of the unknown barium chloride solution is.