My high school science comprehensive chemistry, physics, and biology together was always unfinishe

For people who are slower, I suggest that the first small question of physics can be done, and the last question should not be read at all, which is generally the most time-consuming. If you can't finish this part, then: multiple-choice questions must not be missed, physics experiment questions if you can't think of what to do for a while, forget it, biology and chemistry to see which one is good at first.

If it's about the same, it is recommended to do chemistry first, because it is more efficient to get points for biology questions during the time period when the mind is not very clear before handing in the paper. Of course, I analyzed the situation in Beijing, which is very different from province to province and city, and it is necessary to consider it comprehensively.

There is no trick in learning, if you want to improve the speed of doing questions, you need to practice more, especially chemistry, the question types of the chemistry part are actually very few, organic inference, inorganic inference usually do a little more, concentrate on it, at most ten you can find the law, will be able to improve the speed.

This varies from person to person. Personally, for me. I used to do multiple-choice questions one by one. Do the big questions separately, find the strong discipline first, and do the weak point. First, let's make a few more sets of rolls by yourself.

It is recommended to use time to calculate the time when doing the questions every day, and use the college entrance examination to do the questions when doing the questions. First the easy and then the difficult, first do what you are good at, then do what you can play, and finally do the more difficult ones.

Which subject you are strong in doing that subject first, and then the easy and then the difficult, if you don't, you have to give up....I always start with physics and work my way up...It's hard to give up....But a scroll is only a few creatures, and filling in the blanks will be empty...

Quickly browse the test papers, first easy and then difficult, the multiple-choice questions are slower, and the short-answer questions are the dominant subjects first.

It's easier and then harder, and it's much faster.

Hello for your questions as follows:

Note the order represented by the serial number, indicating that pph3 is added after the formation and then generated, while the catalyst should be added first and then generated.

In a chemical reaction, a substance that can change the chemical reaction rate of reactants (increase or decrease) without changing the chemical equilibrium, and its own quality and chemical properties have not changed before and after the chemical reaction is called a catalyst (solid catalyst is also called a catalyst). Intermediate products are produced by the intermediate process of chemical reactions.

A high school chemistry multiple-choice question, if it is a high school chemistry multiple-choice question, then it is also, this is a high school, this business can be solved by this, and not all high school students can solve it, so it must be compared to this high school student who studies well to play this topic.

The gas mixture passes through an excess NaOH solution, and the gas volume decreases; This is the total volume of SO2+SO3, which can also be said to be the original SO2 volume, and the amount of matter is. The volume of O2 absorbed after equilibrium is. Change.

2so2+o2<=>

2SO3 initiation change.

SO3 conversion rate:

Solution: The volume of air containing oxygen is 20% of the volume of air) N22SO2+O2

2. The volume ratio of SO3, SO2 and SO3 is 1:1, after the reaction, the mixed gas is SO2 and SO3, O2, N2 mixed gas, through the excess NaOH solution, the gas volume is reduced, and the reduced gas is a mixture of SO2 and SO3, the total volume.

The amount of the substance is , then the amount of sulfur dioxide species in the raw gas is.

The remaining gas is then absorbed by the alkaline solution of pyrogallic acid, and the volume of the gas is reduced, that is, the O2 in the mixed gas

is the O2 that is rejected

is 2SO2+O2

2SO3X = Conversion rate of SO3 when equilibrium is reached =

I hope you are satisfied, and if you have any questions, please feel free to ask.

It's good that you don't have enough time to take the exam a good idea of how to think about the questions on the exam paper.

Exam schedules are based on individual circumstances. As you said, you are good at biology and chemistry, of course, you should first hold your score. But I think the reason why you don't have enough time is probably because you spend a lot of time solving some difficult problems in biology and chemistry.

In fact, the timing of the comprehensive answer questions should not be too rigid, because it is difficult to achieve the same degree of difficulty in each subject every time, and each subject also has a finale question (that is, a question that a few people can do completely correctly).

I suggest that you first follow the order in which the test paper is written, and do not think for more than 2 minutes when you encounter a slightly difficult question, and then skip to the next question. Go on and think about the whole question and then go back to the question you didn't answer in the first one. Of course, if you find it difficult in the first article, the topic will be done at the end.

When you're done the second time, go back and check what you've done before and then move on to solving the puzzle.

Also, the lack of time for the exam also means that you have not yet been able to use the knowledge freely, if you want to save more time during the exam, then you usually have to practice more, practice makes perfect This truth is understood by everyone. Of course, even if you are familiar with the topic, you should read the topic carefully, and don't just try to be quick and careless, so the gain outweighs the loss.

The college entrance examination is also approaching, I wish you good results in the exam and enter the ideal university!

YOU TRY SO ... First answer the choice... Answer it all...

Then answer the physics experiment and the first big question (these are easier to get points). Then answer the biology questions,,, then the chemistry questions,,, if you have time, you will answer the last two questions of physics... If you don't have enough time, just write the formula up...

There are also a lot of points...

I will start with simplicity, practice the speed of doing simple problems, and then seize the time to do a good job of difficult problems, in addition, physics must first do experimental problems, which is easier to get a high score.

Then ensure the quality of biology and chemistry answers, and finally control the time for one and a half hours to do physics, and follow the order from easy to difficult to answer questions should be able to get high scores.

I'm a recent graduate of the Class of 2010 and our score distribution is the same as yours, so I'll give you some advice.

Personally, I think that multiple-choice questions are the most important, and it is very important to ensure the accuracy of multiple-choice questions with 6 points for a question. Then do the big question, and when you do the big question, you can choose the subject to do. For example, do biochemistry first, then physics.

Of course, be sure to pay attention to the choice of topics! The winner of the college entrance examination does not get all the questions that others can't get right, but does the questions that others can do but can't get scores. Therefore, you must pick the questions you will do, and you must do them right.

In this way, your time is put to good use. Otherwise, it will be in vain to make difficult questions.

To sum up, it is recommended to make a choice first, and then choose a topic to do a big one.

Of course, everyone's approach is different, you can try other methods and you will always find what works best for you.

If you are a master, you must first do physics, if you can't do it first, you don't have an answer for 3 minutes, and you can change quickly.

Biology selection 8 minutes, chemistry 8 minutes, physics can be extended to 30 minutes, improve the speed of physics questions, really will not do the first question and throw away the rest, biology questions should be controlled in 20-30 minutes.

120 in Physics, 108 in Chemistry, and 72 in Biology. Do you have an idea of what is the key point in terms of the distribution of scores? Personally, I think that many biology questions can take more or less time, because there are a lot of things that are not very certain in it, which means that the time of biology is flexible, while physics and chemistry are different, and physics you can't finish if you don't use so much time.

My suggestion is to do it next to each other in the order of the papers, many of the questions in front of physics should be done, and if you encounter difficult questions, skip them, such as the last two questions of the last big question, and then do chemistry, and do most of the questions in the same way, don't spend too much time on one question, and skip if you don't have an idea after thinking for a while, so that according to the difficulty of the whole set of papers, you decide how much time you spend on biology. On the one hand, this can leave time to deal with the difficult problems in front of you, and on the other hand, most of the time you are still very confident, so this mindset will help you answer the questions, and the other aspect is that you can do everything you can do, so as not to miss a lot of questions that you would have done. Got it?

This is my experience.

You are talking about a big comprehensive, very few people can do it all, which requires a choice to do, I think the front multiple choice questions can be done in order, I remember that only physics is a multiple-choice question, chemistry and biology are single choice, if your physics is not good, it is recommended to do the first two physics questions, they are basic questions, it is easier to score, the latter can give up first, and then do chemistry and biology, if there is still time, then do physics after the big questions, no forget it. I was like this in the college entrance examination that year, and it was not bad. You can give it a try.

Answering questions one by one is a waste of time.

Moreover, the typesetting of the college entrance examination has a certain technical content.

It is the format that is most adapted to the human brain.

You can answer the biology you are good at first, but you have to control the time not to exceed half an hour, chemistry and physics also determine the time, physics is poor, write the questions you are sure of first, and then write the ones that you can't get accurate, and the general time will not be rich for too long, so the accuracy rate.

3.Pluripotent stem cells have homologous chromosomes, but there is no syndication.

4.Compared with desert ecosystems, grassland ecosystems have complex trophic structures and high resistance stability. Interfere with the same intensity rather than destroy.

pv=nrt Kraberon's formula, where pressure and volume can be reached by volume on both sides of the equation, but there are many values that can keep the volume constant 2. 3 will not be there You read wrong 4

It's useless to read books now, so adjust your mentality more.

I'm a person from the past, let me tell you what's important, mathematics and English are required in college, these two subjects are required, if you choose chemistry, biology, you have to learn organic and inorganic, which is more difficult. Since you want to study well, then you can listen to what I said, although your grades are better than mine, but I am a partial subject, and I am the first in my high school chemistry grade.

You want to learn and improve chemistry well. The following must be done.

First. You have to be interested in chemistry. Cultivating interest can start by looking at the introduction.

Second. Must have an understanding of chemical theories, formulas, periodic tables, chemical equations, dissolution tables, and valence tables!

Third. Reading a chapter, writing a chapter, you have to use more hands, use your brain more, think more, and complete it independently.

Fourth. Rest more, play games less, combine work and rest, and remember to read the introduction to chemistry, which is a good thing!!

Go buy a kit. Think about it before you buy it. To be able to do well, read more textbooks, and English words must be fixed.

Read more books on biochemistry, and the materials will basically reach 90. Physics is not easy to say, if you have a good teacher, it is not a problem to keep up with 90 for a while. But it's a pity that you have to work overtime.

If you have patience and perseverance, you can get on top.

1.The breakthrough A particle refers to helium 2 protons, 4 masses multiplied by 2 4 protons, 8 masses, but he absorbs one neutron, the mass number minus 1, is 7, but the number of protons should not change as 4

2。One by one, h216o hd16o d216oh217o hd17o d218o

h218o hd18o d218o

Sometimes the most direct solution is also the simplest and least easy way.

2CO2 x 46 tons.

x = 180 * 46 92 tons (glucose).

Corn glucose sugar = 1 m

Alcohol production is reduced, and no alcohol is produced for aerobic respiration.

, z=3, because neutrons decay into protons plus electrons, and there are only 3 protons.

2.There are 3 combinations of two hydrogens and 3 types of oxygen, 3*3=9 types.

Let's start with chemistry :

1.Choose A. Conservation by mass:

z+1 (neutron mass) = 0 (electron massless) + 2 4 (two particle masses) to get 7; Then the charge is conserved: a = 2 2 (the amount of charge of two particles) - 1 (the amount of electron charge) - 0 (neutron no charge) = 3.

Seed. With permutations: water consists of two H, one O, each H has two possibilities, and each O has three possibilities, 2 2 3 12.

Physics: The answer is 20s.

The process of the second floor is correct.

Biological: C6H12O6 2C2H5OH + 2CO2 180T 92T

x 46t gives x = 90t, and then divides 90 by m to get the corn mass of 90 m2will decrease.

In the later stage, when the yeast is no longer considered to have proliferated (ignoring the effect of oxygen on the number of yeasts), the yeast will switch from anaerobic respiration to mainly aerobic respiration, and the alcohol production will naturally decrease.

I just graduated from high school, so it's so kind to look at these topics again

1.The particle is helium with a proton number of 2 and a mass of 4, then the two are proton 4 mass number 8. He wants to add an electron and subtract a neutron, then a = 8 - 1 = 7, according to the conservation of charge z = 4 - 1 = 3 so choose a answer.

2.Water is two hydrogen and one oxygen. There are three combinations of two hydrogen atoms, then the total number of combinations is 3*3=9.

Don't want to do it, hehe.