What is the level of the high school chemistry exam?

I'm from Tianjin, our exam here is simply too simple, of course, if you don't usually study hard, it is likely not to pass, now the national examination level is generally lower than the college entrance examination, if the college entrance examination is the finale of all kinds of reference books, the exam question is likely to be the first question of the example question in the reference book, which belongs to the type of giant simplicity. Of course, the last question of the chemistry exam paper is also difficult, but if it can stump you like this, what else will there be? The answer, the board has been.

My exam took 90 minutes for the math exam (50 minutes were wasted studying the last question).

Physics: 60 minutes, Chemistry: 70 minutes, Biology: 30 minutes.

Tianjin 2005 Entrance Examination Selection.

Question 34. Dissolved in water, prepared into a 100ml solution, the amount of solute substances in the solution is how much mol l; 10 ml of this solution reacts with a sufficient amount of dilute sulfuric acid, resulting in a gas volume of mlAnswer:

Question 35. 100ml of a mixed solution containing (NH4)2CO3 and K2CO3, ask to add a sufficient amount of BA(OH)2 solution dropwise, heat, fully react, and after all the generated gas escapes, the volume under the standard condition is measured to be 448ml, and the reaction solution is filtered to obtain a white precipitate to find the amount and concentration of K2CO3 in the original mixed solution (Hint: (NH4)2CO3 + BA(OH)2=heating BAC3 +2NH3 +2H2O)Answer:

Question 28. There are 5 organic compounds: ethylene, ethanol, acetaldehyde, acetic acid, ethyl acetate.

Please write a brief structure of the organic matter containing the following functional groups:

oh＿＿＿cho＿＿＿cooh＿＿＿

Among the five organic substances mentioned above (fill in the serial number).

The silver mirror reaction can occur

It can be eliminated

Hydrolysis reaction can occur

It is acidic and can undergo esterification reaction

Both addition and polymerization reactions can occur

Answer ch3ch2oh(ethanol) or ch3cooh(acetic acid) ch3cho(acetaldehyde) ch3cooh

It's easy.

Basically, it's all excellent.

The High School Entrance Examination (also known as the Provincial College Entrance Examination) refers to the unified examination established by each province for high school graduates, and it is part of the traditional examination system of the Chinese Pai Sui Ma. Here's some information about the baccalaureate:

1.Examination subjects: The subjects of the senior high school diploma examination vary from province to province, and generally include subjects such as Chinese, mathematics, English, and comprehensive arts and sciences.

3.Exam format: The Baccalaureate exam has a variety of test formats, usually including multiple-choice questions, fill-in-the-blank questions, short-answer questions, and essay questions.

4.Examination content: The examination content of the high school entrance examination generally covers the learning content of three years of high school, and requires students to have a solid basic knowledge and comprehensive ability.

5.Test scores: The results of the baccalaureate are generally only valid within the province. The grading criteria vary from province to province, and results are graded according to rankings or rankings.

It should be noted that the high school examination system is different from province to province, and the content and method of the examination are also different. In the process of preparing for the exam, it is recommended that students carefully understand the specific situation of the high school entrance examination in their province and make a corresponding preparation plan according to the content and format of the exam.

The baccalaureate examination refers to a type of high school leaving examination that is practiced in parts of Chinese mainland. Unlike the general college entrance examination, the baccalaureate examination is not used for admission to university, but is used to assess students' academic level and issue high school diplomas.

The HKALES is generally divided into two subjects: Chinese and Mathematics. There are various types of exams, including multiple-choice, fill-in-the-blank, calculation and application questions. The exam time is generally 3 to 4 hours, and the difficulty of the exam is relatively low, and more emphasis is placed on the examination of basic knowledge than the general college entrance examination.

In addition, there may be some differences in the high school entrance examinations in different regions, for example, some regions will increase the number of examinations in other subjects, or adopt more stringent examination methods and standards.

In conclusion, the baccalaureate is an examination used to assess students' academic level and issue a diploma, mainly examining the basic knowledge of Chinese and mathematics, and the difficulty of the examination is relatively low.

The baccalaureate is a graduation examination in parts of Chinese mainland that replaces the general high school leaving examination ("gaokao"). At present, in Chinese mainland, the high school entrance examination has been gradually replaced by the general college entrance examination, and gradually withdrew from the historical stage.

Compared with the general college entrance examination, the content and difficulty requirements of the high school entrance examination are relatively simple, and the basic knowledge and ability level of students are mainly examined. In addition, the results of the baccalaureate examination are not directly used for further education and talent selection, but are used for the issuance of high school diplomas. Therefore, compared with the general college entrance examination, the high school entrance examination pays more attention to the cultivation of students' all-round quality and knowledge structure.

It should be noted that since the HS HKALES is only implemented in some regions, there are certain differences in different regions, including the test subjects, test difficulty and scoring criteria. In some areas, there is no HSE or has gradually eliminated it in favor of the general gaokao for high school graduation assessment.

You let me write it all?

No, it's too abusive!!

I'll lend you a notebook to see, and I'll show you everything.

A:Fe B:O2 A reacts with B to form D, so D is Fe3O4E reacts with A to form D, so E is H2O

The equation is that Fe reacts with H2O to produce Fe3O4 and H2, and the yellow-green gas has only Cl2

C and A have the same composition and are acids, so C is a schematic diagram of the atomic structure of HCL and a schematic diagram of the chlorine atom.

Since Fe and Cl2 form ferric chloride, iron and hydrochloric acid form ferrous chloride, and ferrous chloride reacts with chlorine gas to form ferric chloride.

Therefore, the ionic equation of a and e to produce d is 2fe2 + cl2 = 2fe3 + + 2cl - pay attention to the positive and negative charges and the plus sign in the equation when you look at it, it is not easy to play, I hope to adopt it!

(1) D is a ferrous solid, the common ferrous metal compounds in high school chemistry are copper oxide, ferric tetroxide, manganese dioxide, etc., and the common colorless gases are hydrogen, nitrogen, oxygen, and a simple attempt to push these substances can get a is iron, b is oxygen, d ferric tetroxide, c hydrogen, e water, and the reaction written in the question is that iron and water vapor react at high temperature to produce ferric tetroxide and hydrogen.

2) A is yellow-green gas chlorine, and C is HCL hydrochloride from the title, because the reaction products of hydrochloric acid and metal B can be further oxidized by chlorine, so B is iron, E is ferrous chloride, D is ferric chloride, and A and B are the reaction of iron combustion in chlorine gas.

(1) b is oxygen cu+no – (heating combustion) cuo + n2

2) A is chlorine gas (write the structure by yourself), C is HCl, 2Fe2++Cl2 - 2Fe3++2Cl-1

Salt water is ionic and conducts electricity, whereas sucrose is an organic molecule that does not conduct electricity.

Chloride anion ions can be replaced by bromine water to react, and bubbles are produced in the solution, while sucrose cannot react

NaHCO3 is selected to generate sodium chloride, carbon dioxide and water with hydrochloric acid, and sodium hydroxide is reacted to produce sodium carbonate and water.

A sodium hydroxide can only react with hydrochloric acid c neither can react with sodium chloride and does not meet the conditions for metathesis reaction.

d Sodium carbonate can only react with hydrochloric acid.

A n2 molar mass 28 The first amount of the substance is 56 28 = 2molb The water under the standard condition is liquid, and the density is calculated according to the number l of 1000g The total amount of the pure molar mass of the substance is 18g 22400 18 = 1244mol

cd: What constant is that, so here's B

fe + cu2+ =fe2+ +cu

56g 64g 64gcu complete reaction solid weight gain 64-56=8gn g x g x g cu complete reaction solid increase weight ( m -n)g according to the proportion of 64 x=8 (m-n),x=8 (m-n)g root annihilation according to the mass of the reaction complete copper ion concentration: c=n v=(x 64) (v state cavity 1000)l=(m-n)*1000 (8v)mol l

The molecular weight of iron is 56 and the molecular weight of copper is 64. Astature m=m-n, m=8. The sedan car failed.

The wide mountain is c=(m-n) 8 1000 v = (m-n)1000 8v.