Who are these tests for?
These materials are intended for schoolchildren preparing for OGE-2018 in chemistry. They can also be used for self-control when studying a school chemistry course. Each one 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 subject tests structured?
Will there be other subject tests published on this site?
Undoubtedly! I plan to post tests on 23 topics, 10 tasks each. Stay tuned!
What else is on this site for those preparing for the OGE-2018 in chemistry?
Do you feel like something is missing? Would you like to expand any sections? Need some new materials? Is there anything that needs to be fixed? Found any errors?
Good luck to everyone preparing for the Unified State Exam and the Unified State Exam!
Option
control measuring materials for
holding in 2017 the main state
CHEMISTRY exam
Instructions for performing the work
The examination paper consists of two parts, including 22 tasks. Part 1 contains 19 short-answer tasks, part 2 contains 3 long-answer tasks.
You are given 2 hours (120 minutes) to complete the exam paper in chemistry.
Answers to tasks 1–15 are written as one number, 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 answer form No. 1.
Answers to tasks 16–19 are written as a sequence of numbers. Write this sequence of numbers in the answer field in the text of the work, and then transfer it to answer form No. 1.
For tasks 20–22, you should give a complete, detailed answer, including the necessary reaction equations and calculations. The tasks are completed on answer form No. 2.
When performing work, you can use the Periodic Table of Chemical Elements D.I. Mendeleev, table of solubility of salts, acids and bases in water, electrochemical series metal stresses and a non-programmable calculator.
When completing assignments, you can use a draft. Entries in the draft are not taken into account when grading work.
The points you receive 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 number, which corresponds to the number of the correct answer. Write this number 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.
A chemical element of the 3rd period of the VA group corresponds to a diagram of the distribution of electrons across layers:
An ionic bond is characteristic of 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 a solution of sulfuric acid (s)
4) four
Answer:Are the judgments about the methods of separating mixtures correct?
A. Evaporation is a physical method for separating mixtures.
B. Separation of a mixture of water and ethanol is possible by filtration.
1) only A is correct
2) only B is correct
3) both judgments are correct
4) both judgments are incorrect
| The element carbon is an oxidizing agent in the reaction |
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The answer to tasks 16–19 is a sequence of numbers that should be written in ANSWER FORM No. 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. What magnesium and silicon have in common is
1) the presence of three electronic layers in their atoms
2) the existence of simple substances corresponding to them in the form of diatomic molecules
3) the fact that they belong to metals
4) the fact that their electronegativity value 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.
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| Match the name of the substance with the reagents with which this substance can interact. |
Do not forget to transfer all answers to answer form No. 1 in accordance with the instructions for completing the work.
Part 2
For answers to tasks 20–22, use ANSWER FORM No. 2.
First write down the number of the task (20, 21 or 22), and then the detailed answer to it. Write down your answers clearly and legibly.
20. Using the electron balance method, create an equation for the reaction
KMnO 4 + KOH → K 2 MnO 4 + O 2 + H 2 O
Identify the oxidizing agent and the 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 the deposited sediment.
22. Given substances: Zn, HCl (solution), H 3 PO 4, AgNO 3, NH 4 Cl, Ba(NO 3) 2. Using water and 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 equation for the reaction.
The Unified State Exam in Chemistry is an exam taken by graduates planning to enter a university for certain specialties related to this discipline. Chemistry is not included in the list of compulsory subjects; according to statistics, 1 out of 10 graduates takes chemistry.
- The graduate receives 3 hours of time to test and complete all tasks - planning and distributing time to work with all tasks is an important task for the test taker.
- Usually the exam includes 35-40 tasks, which are divided into 2 logical blocks.
- Like the rest of the Unified State Examination, the chemistry test is divided into 2 logical blocks: testing (selecting the correct option or options from those proposed) and questions that require detailed answers. It is the second block that usually takes longer, so the subject needs to manage time rationally.
- The main thing is to have reliable, deep theoretical knowledge that will help you successfully complete various tasks of the first and second blocks.
- You need to start preparing in advance in order to systematically work through all the topics - six months may not be enough. The best option– start preparing in the 10th grade.
- Identify the topics that give you the most problems so that when you ask a teacher or tutor for help, you know what to ask.
- Learning to perform tasks typical for the Unified State Exam in chemistry is not enough to master the theory; it is necessary to bring the skills of performing tasks and various tasks to automaticity.
- Not always self-study effective, so it’s worth finding a specialist to whom you can turn for help. The best option is a professional tutor. Also, don’t be afraid to ask questions to your school teacher. Do not neglect your school education, carefully complete assignments in class!
- There are hints in the exam! The main thing is to learn how to use these sources of information. The student has the periodic table, tables of metal stress and solubility - this is about 70% of the data that will help to understand various tasks.
- Chemistry requires a thorough knowledge of mathematics - without this it will be difficult to solve problems. Be sure to repeat the work with percentages and proportions.
- Learn the formulas needed to solve chemistry problems.
- Study the theory: textbooks, reference books, collections of problems will be useful.
- The best way to consolidate theoretical assignments is to actively solve chemistry assignments. IN online mode you can solve in any quantity, improve your skills in solving problems of different types and levels of complexity.
- Controversial issues in assignments and errors are recommended to be sorted out and analyzed with the help of a teacher or tutor.
The OGE in chemistry is taken only at the student’s choice; this test is not included in the list of mandatory ones. Chemistry is chosen by students who, after the 9th grade, plan to enter a specialized 10th grade school or a specialized college or technical school. To enter medical school, you need to take not only chemistry, but also biology. The exam implies orientation in theory and successful application of it in practice. The test subject needs to solve many tasks of different difficulty levels from wide range topics To decide which topics to pay attention to, read the OGE preparation program in chemistry.
The exam consists of tasks, which are divided into two logical blocks:
- The first part includes tasks on knowledge of theory: here you need to give a short answer - a number, a sequence of numbers, a word.
- In the second part there are several questions to which you need to give detailed, complete answers, conduct a laboratory experiment, write conclusions, and perform calculations. It is extremely important to be able to use special equipment and use algorithms for solving problems of varying levels of complexity.
During the exam, the test taker has tips: tables of solubility of salts, acids, bases in water, periodic table of Mendeleev, tables of metal stresses. Provided you know how to use these materials, you can solve many tasks without difficulty.
- The main advice that is relevant for every exam is to plan your study. Without a clear plan you will not be able to achieve high level preparation. To make your planning as efficient as possible, check out– it indicates topics and sections to which you need to pay special attention.
- Assess your strengths: the easiest way is online testing. After passing the test, you receive the result and can evaluate which types of tasks and topics cause you the most difficulty.
- Once you have identified problematic topics, give them more attention than others. For training, take textbooks and reference books.
- Be sure to solve problems! The more problems you solve to prepare, the easier it will be in the exam.
- Ask questions: find a specialist who can help you in problematic situations. This could be a tutor or school teacher. Only a specialist can help you analyze your mistakes and not make them again.
- Learn to use hints - those tables that you can take with you to the exam.
- Studying theory is not enough; it is very important to practice performing tests. This form of knowledge testing causes difficulties for many, especially if it was not used in lessons. Solve more test tasks different types so that during the exam they do not cause fear and misunderstanding.
- “Solving the OGE in Chemistry” will help you prepare for the exam and pass it successfully, using the allotted time rationally and without stress.
Part 1 contains 19 short answer questions, including 15 questions basic level complexity (serial numbers of these tasks: 1, 2, 3, 4, ...15) and 4 tasks higher level complexity (ordinal numbers of these tasks: 16, 17, 18, 19). Despite all their differences, the tasks in 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). The sequence of numbers is written on the answer form without spaces or 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 exam models 1 and 2 lies in the content and approaches to completing the last tasks of the exam options:
Examination model 1 contains task 22, which involves performing a “thought experiment”;
Examination model 2 contains tasks 22 and 23, which involve completing laboratory work(real chemical experiment).
Scale for converting points to grades:
"2"– from 0 to 8
"3"– from 9 to 17
"4"– from 18 to 26
"5"– from 27 to 34
System for assessing the performance of individual tasks and the examination work as a whole
Correct completion of each of tasks 1–15 is scored 1 point. Correct completion of each of tasks 16–19 is assessed with a maximum of 2 points. Tasks 16 and 17 are considered completed correctly if two answer options are correctly selected in each of them. For an incomplete answer - one of two answers is correctly named or three answers are named, two of which are correct - 1 point is given. The remaining answer options are considered incorrect and are scored 0 points. Tasks 18 and 19 are considered completed correctly if three correspondences are correctly established. An answer in which two out of three matches are established is considered partially correct; it is worth 1 point. The remaining options are considered an incorrect answer and are scored 0 points.
The tasks of Part 2 (20–23) are checked by a subject commission. Maximum score 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.
To complete the examination work in accordance with model 1, 120 minutes are allotted; according to model 2 – 140 minutes
