Training option oge chemistry. Collection of Ideal Social Studies Essays
Part 1 contains 19 tasks with a short answer, including 15 tasks of the basic level of difficulty (ordinal numbers of these tasks: 1, 2, 3, 4, ... 15) and 4 tasks of an increased level of difficulty (ordinal numbers of these tasks: 16, 17, 18, 19). For all their differences, the tasks of this part are similar in that the answer to each of them is written briefly in the form of one number or a sequence of numbers (two or three). A sequence of numbers is written into the answer sheet without spaces and other additional characters.
Part 2, depending on the CMM model, contains 3 or 4 tasks of a high level of complexity, with a detailed answer. The difference between examination models 1 and 2 lies in the content and approaches to completing the last tasks of the examination options:
Examination model 1 contains task 22, which provides for the implementation of a "thought experiment";
Examination model 2 contains tasks 22 and 23, providing for the performance of laboratory work (real chemical experiment).
Scale for converting points into grades:
"2"- from 0 to 8
"3"- from 9 to 17
"4"- from 18 to 26
"5"- from 27 to 34
The system for assessing the performance of individual tasks and examination work as a whole
Correct performance of each of tasks 1–15 is estimated with 1 point. Correct completion of each of the tasks 16-19 is estimated at a maximum of 2 points. Tasks 16 and 17 are considered completed correctly if in each of them two answers are correctly chosen. For an incomplete answer - one of the two answers is correctly named or three answers are named, of which two are correct - 1 point is given. The rest of the answer options are considered incorrect and score 0 points. Tasks 18 and 19 are considered completed correctly if three matches are correctly established. The answer is considered to be partially correct, in which two matches out of three are established; it is estimated at 1 point. The rest of the options are considered an incorrect answer and are scored 0 points.
Checking the tasks of part 2 (20-23) is carried out by the subject commission. Maximum mark for a correctly completed task: for tasks 20 and 21 - 3 points each; in model 1 for task 22 - 5 points; in model 2 for task 22 - 4 points, for task 23 - 5 points.
120 minutes are allotted for the examination work in accordance with model 1; according to model 2 - 140 minutes
In this section, I systematize the analyzes of problems from the OGE in chemistry. Similar to the section, you will find detailed analyzes with instructions for solving typical problems in chemistry in the OGE grade 9. Before analyzing each block of typical tasks, I give a theoretical background, without which the solution of this task is impossible. There is just as much theory as it is enough to know to successfully complete the task on the one hand. On the other hand, I tried to describe the theoretical material in an interesting and understandable language. I am sure that after completing the training on my materials, you will not only successfully pass the OGE in chemistry, but also fall in love with this subject.
General information about the exam
OGE in chemistry consists of three parts.
In the first part 15 tasks with one answer- this is the first level and the tasks in it are simple, provided, of course, you have basic knowledge of chemistry. These tasks do not require calculations, with the exception of task 15.
The second part consists of four questions- in the first two - 16 and 17, you need to choose two correct answers, and in 18 and 19, correlate the values or statements from the right column with the left.
The third part is problem solving... At 20 you need to level the reaction and determine the coefficients, and at 21 you need to solve the calculation problem.
Fourth part - practical, uncomplicated, but you need to be careful and careful, as always when working with chemistry.
Total for work is given 140 minutes.
Below are the typical options for tasks, accompanied by the theory required for the solution. All tasks are thematic - a topic for general understanding is indicated opposite each task.
Tips for preparing for the exam in chemistry on the website site
How to correctly pass the exam (and OGE) in chemistry? If the time is only 2 months, and you are not ready yet? And don't be friends with chemistry either ...
Offers tests with answers on each topic and task, passing which you can study the basic principles, patterns and theory found in the exam in chemistry. Our tests allow you to find answers to most of the questions encountered in the exam in chemistry, and our tests allow you to consolidate the material, find weak points, and work out the material.
All you need is internet, stationery, time and a website. It is best to have a separate notebook for formulas / solutions / notes and a dictionary of trivial compound names.
- From the very beginning, you need to assess your current level and the number of points that you need, for this it is worth going through. If everything is very bad, but you need excellent performance - congratulations, even now all is not lost. You can manage to train yourself to pass successfully without the help of a tutor.
Decide on the minimum number of points that you want to score, this will allow you to understand how many tasks you have to solve exactly in order to get the point you need.
Naturally, keep in mind that things may not go so smoothly and solve as many problems as possible, but better at all. The minimum that you have defined for yourself - you have to solve ideally. - Let's move on to the practical part - training for the solution.
The most effective way is the following. Select only the exam you are interested in and decide the appropriate test. About 20 completed tasks guarantee meeting all types of tasks. As soon as you begin to feel that you know how to solve every task you see from beginning to end - proceed to the next task. If you do not know how to solve any task, use the search on our website. There is almost always a solution on our website, otherwise just write to the tutor by clicking on the icon in the lower left corner - it's free. - In parallel, we repeat the third point for everyone on our site, starting with.
- When the first part is given to you at least at an intermediate level, you start to decide. If one of the tasks does not lend itself well, and you made a mistake in completing it, then return to the tests for this task or the corresponding topic with tests.
- Part 2. If you have a tutor, focus with him on studying this part. (provided that you are able to solve the rest at least 70%). If you started part 2, then you should get a passing mark without any problems 100% of the time. If this does not happen, it is better to stay on the first part for now. When you are ready for part 2, we recommend that you get a separate notebook where you will write down only the solutions of part 2. The key to success is solving as many tasks as possible, as in part 1.
Who are these tests for?
These materials are intended for students preparing for OGE-2018 in chemistry... They can also be used for self-control when studying a school chemistry course. Each is dedicated to a specific topic that a ninth grader will meet on the exam. The test number is the number of the corresponding task in the OGE form.
How are thematic tests organized?
Will there be other topic tests published on this site?
Undoubtedly! I plan to post tests on 23 topics, 10 assignments each. Stay tuned!
What else is there on this site for those preparing for the OGE-2018 in chemistry?
Do you think that something is missing? Would you like to expand some sections? Do you need any new materials? Do you need to fix something? Found bugs?
Good luck to everyone preparing for the OGE and the Unified State Exam!
Option
control measuring materials for
holding in 2017 the main state
CHEMISTRY exam
Work instructions
The examination paper consists of two parts, including 22 tasks. Part 1 contains 19 tasks with a short answer, part 2 contains 3 tasks with a detailed answer.
2 hours (120 minutes) are allotted for the performance of the examination work in chemistry.
Answers to tasks 1-15 are written in the form of one digit, which corresponds to the number of the correct answer. Write this figure in the answer field in the text of the work, and then transfer it to the answer form No. 1.
Answers to tasks 16-19 are written in the form of a sequence of numbers. Write this sequence of numbers in the answer field in the text of the work, and then transfer it to the answer form No. 1.
For tasks 20-22, a full detailed answer should be given, including the necessary reaction equations and calculations. Tasks are performed on answer form No. 2.
When performing work, you can use the Periodic Table of Chemical Elements of D.I. Mendeleev, a table of the solubility of salts, acids and bases in water, an electrochemical series of metal voltages and a non-programmable calculator.
When completing assignments, you can use the draft. Draft entries do not count towards grading work.
The points received by you for completed tasks are summed up.
Try to complete as many tasks as possible and score the most points.
We wish you success!
Part 1
The answer to tasks 1-15 is one digit, which corresponds to the number of the correct answer. Write down this figure in the answer field in the text of the work, and then transfer it to ANSWER FORM No. 1 to the right of the number of the corresponding task, starting from the first cell.
The chemical element of the 3rd period of the VA group corresponds to the electron distribution scheme over the layers:
Ionic bond is characteristic for each of two substances:
1) potassium chloride and hydrogen chloride
2) barium chloride and sodium oxide
3) sodium chloride and carbon monoxide (IV)
4) lithium oxide and chlorine
Answer:Each of the two substances is complex
1) water and chlorine
2) water and hydrogen
3) hydrogen and quartz
4) benzene and water
Answer:The largest number of positive ions is formed during the dissociation of 1 mol
1) sulfuric acid
2) sodium phosphate
3) iron (III) nitrate
4) potassium sulfide
Answer:Both substances of the pair react with water at room temperature
1) oxygen and carbon
2) magnesium and sulfur
3) aluminum and phosphorus
4) sodium and calcium
Answer:Among the substances: Zn, Al 2 O 3, Cu (OH) 2, BaCl 2 - reacts with sulfuric acid solution
4) four
Answer:Are the judgments about the methods of separating mixtures correct?
A. Evaporation refers to the physical methods of separating mixtures.
B. Separation of a mixture of water and ethanol is possible by filtration.
1) only A is true
2) only B is true
3) both statements are true
4) both judgments are wrong
| The element carbon is an oxidizing agent in the reaction |
||||||||||||
|
The answer to tasks 16-19 is a sequence of numbers that should be written in ANSWER FORM № 1 to the right of the number of the corresponding task, starting from the first cell. Write your answer without spaces, commas, or other additional characters.
Write each number in a separate box in accordance with the samples given in the form.
When completing tasks 16, 17 from the proposed list of answers, select two correct ones and write down the numbers under which they are indicated in the table.
16. Common to magnesium and silicon is
1) the presence of three electron layers in their atoms
2) the existence of the corresponding simple substances in the form of diatomic molecules
3) the fact that they are metals
4) the fact that the value of their electronegativity is less than that of phosphorus
5) their formation of higher oxides with the general formula EO 2
Answer:When completing tasks 18, 19 for each element of the first column, select the corresponding element from the second column. Write down the selected numbers in the table under the corresponding letters. The numbers in the answer may be repeated.
|
| Establish a correspondence between the name of a substance and the reagents with which this substance can interact. |
Do not forget to transfer all answers to answer form # 1 in accordance with the instructions for the work.
Part 2
For answers to tasks 20-22, use ANSWER FORM № 2.
First write down the task number (20, 21 or 22), and then the detailed answer to it. Write down the answers clearly and legibly.
20. Using the electronic balance method, write the reaction equation
KMnO 4 + KOH → K 2 MnO 4 + O 2 + H 2 O
Determine the oxidizing agent and reducing agent.
21. An excess of potassium hydroxide solution was added to 376 g of a solution with a mass fraction of copper (II) nitrate of 7.5%. Determine the mass of precipitated sediment.
22. Substances are given: Zn, HCl (solution), H 3 PO 4, AgNO 3, NH 4 Cl, Ba (NO 3) 2. Using water and the necessary substances only from this list, get zinc nitrate in two stages. Describe the signs of the reactions being carried out. For an ion exchange reaction, write the abbreviated ionic reaction equation.