Maleic acid was first discovered almost 200 years ago. It was synthesized by distillation of malic acid. In the future, it found its application in the chemical field, and this is worth talking about in detail. However, first we will talk about its properties and other features. Last modified: 2025-01-23 12:01
Secondary education and schools
Mikhail S altykov-Shchedrin is the creator of a special literary genre - a satirical fairy tale. In short stories, the Russian writer denounced bureaucracy, autocracy, and liberalism. This article discusses such works by S altykov-Shchedrin as "The Wild Landowner", "The Eagle-Patron", "The Wise Gudgeon", "Karas-Idealist". Last modified: 2025-01-23 12:01
Every high school student has heard of angiosperms. It is not surprising, because one of the most important sections of botany is devoted to them. In addition, representatives of angiosperms literally surround us, meeting at every step. Last modified: 2025-01-23 12:01
All hereditary information that is necessary for the development of the zygote and the growth of the child after birth is encrypted in the genes. Sections of DNA are the most basic carriers of hereditary information. Through the interaction of DNA and 3 types of RNA, all encoded information is realized. All interactions occur at the nucleotide level. Last modified: 2025-01-23 12:01
All the bodies that surround us are made up of atoms. Atoms, in turn, are assembled into a molecule. It is due to the difference in the molecular structure that all substances differ from each other in their properties and parameters. Molecules and atoms are always in a state of dynamics. Moving, they still do not scatter in different directions, but are held in a certain structure, which we owe to the existence of such a huge variety of substances in the whole world around us. What are these particles?. Last modified: 2025-01-23 12:01
Despite its inconspicuousness and conservatism, Venezuela is a fairly developed state with a population of many millions. Last modified: 2025-01-23 12:01
Perhaps there is nothing more joyful for schoolchildren than the holidays in November. Finally, the first quarter is over. After the summer holidays it is difficult to get involved in studies, and the days are still warm. As teachers say, the first quarter is always a buildup, the inclusion of children in the learning process. Last modified: 2025-01-23 12:01
The article tells about the history of the development of Polish statehood and the evolution of the constitutional law of the republic. The main dates that are of particular importance in the history of Poland are given. Last modified: 2025-01-23 12:01
Everyone knows what gas is. For gases (their behavior depending on conditions, for example) there are laws. What is a gas law, what laws are there, for which gases they apply, conditions, as well as gas laws in physics and chemistry are discussed in the article. Last modified: 2025-01-23 12:01
Accompanying his speech with finger gestures, a person thus expresses his emotions or simply complements the conversation. But what each gesture means, this article will tell. Last modified: 2025-01-23 12:01
Studying the section "Triangles" in geometry, you passed the topic "Bisector of the angle of a triangle" at school. But in the school curriculum, teachers were instructed to go over this topic superficially, without going into details. And you, so to speak, are choked by curiosity, they say, I want to know as much as possible about the bisector. In this article I will try to satisfy your interest. Last modified: 2025-01-23 12:01
Training is a controlled, specially organized process of interaction between a teacher and students, aimed at mastering a system of knowledge, skills and abilities, as well as shaping the worldview of students, developing potential opportunities and consolidating self-education skills in accordance with the goals set.. Last modified: 2025-01-23 12:01
The Don River was called Amazonia by some ancient writers, because according to the legends recorded by the ancient Greek historian Herodotus, who lived in the 5th century BC, a warlike Amazon tribe lived on the shores of the Sea of Azov and along the lower Don. But this is not the only interesting fact about this river, and in our time, the Don has something to surprise. Last modified: 2025-01-23 12:01
The main races, in which humanity has been successfully imprinted on all continents of the Earth, branch into a complex mosaic of anthropological types of people - small races (or races of the second order). Anthropologists distinguish from 30 to 50 such groups. Last modified: 2025-01-23 12:01
An important section of thermodynamics is the study of transformations between different phases of a substance, since these processes occur in practice and are of fundamental importance for predicting the behavior of a system under certain conditions. These transformations are called phase transitions, to which the article is dedicated. Last modified: 2025-01-23 12:01
Any contact between two bodies results in a friction force. In this case, it does not matter in what aggregate state of matter the bodies are, whether they move relative to each other or are at rest. In this article, we briefly consider what types of friction exist in nature and technology. Last modified: 2025-01-23 12:01
There are many different situations in which you need to write a letter of appeal. The pattern is the first thing to consider. Because such a document is official and very important for many. And, accordingly, he must meet certain requirements. Last modified: 2025-01-23 12:01
The article gives several definitions of an educated person, presents qualities, both personal and social. In addition, the role of education is named, its relationship with culture and intelligentsia is considered. The text helps answer one of the most pressing questions: "Why do you need to study and be an educated person?". Last modified: 2025-01-23 12:01
Everyone knows from childhood that a book is the best gift. What is the benefit of reading, is fiction really necessary?. Last modified: 2025-01-23 12:01
How many hours are there in a day? Everyone knows this - 24 hours. But why did it happen? Let's take a closer look at the history of the appearance of the main units of time measurement and find out what a day is, how many hours, seconds and minutes are in a day. And also let's see if it is worth tying these units exclusively to astronomical phenomena. Last modified: 2025-01-23 12:01
According to one of two versions, it was fixed in Russia in a specifically stated law of 1592. It finally established the unequal rights of the landowner and the peasant, and serfdom in Russia was fixed at the official level. In another presentation, it arose gradually and led to the complete loss of any independence among the poor peasants. The royal manifesto abolished serfdom in 1861, February 19. Last modified: 2025-01-23 12:01
In life we are often faced with making decisions. For many, this is a big problem, because it is impossible to predict everything, and the responsibility for the consequences continues to press. In such a situation, you just want to abstract from any actions and hand over the responsible choice to someone else. And this refusal to choose often brings problems. Fortunately, different decision-making techniques are popularized at different times. Here we will consider one of the most popular - "square De. Last modified: 2025-01-23 12:01
Viktor Fedorovich Shatalov is the author of a unique methodological system of education. His methodology not only allows to achieve high results in a short time, but also educates children in independence, self-confidence, teaches mutual assistance. Last modified: 2025-01-23 12:01
The Great Migration and the formation of barbarian kingdoms summed up the history of the Ancient World and marked the beginning of the Middle Ages. It was then that the face of modern Europe began to take shape. Last modified: 2025-01-23 12:01
The capital of which European country is still filled with such a provincial and cozy atmosphere as Oslo? And this is despite the fact that about 600 thousand people live in it. Last modified: 2025-01-23 12:01
For example, often even adults are faced with the question of how to write something correctly. Sock or socks, tomatoes or tomatoes? Let's figure it out. So, a kilo of tomatoes or tomatoes? What expression should be used for writing and speaking?. Last modified: 2025-01-23 12:01
Birds are found everywhere. Some of them are distributed mainly in settlements, while others make seasonal flights over various distances. Sedentary birds include individuals that live year-round in one place. They do not make long-distance migrations. As a rule, animals are adapted to living near humans. Last modified: 2025-01-23 12:01
You rarely meet a person who does not know who the cat is? After all, a fluffy and sometimes rather wayward animal lives in almost every house, pleasing the eyes of all household members. But where did the word "cat" come from? If you do not know, but really want to understand the answer to this question, read the article. And then you will understand everything. Last modified: 2025-01-23 12:01
The work of a livestock breeder is studied in elementary school as part of the program of the subject "The World Around". At such lessons, children receive information not only about one of the professions that they may have to choose for themselves in the future. They also get acquainted with the features of the area in which they live. This knowledge is part of the overall picture that the student should develop in the process of passing such topics as "The art of my people", "The nature of our area" and so on. Last modified: 2025-01-23 12:01
Campaign of Russian princes against the Polovtsians. The image and characterization of Vsevolod in the Tale of Igor's Campaign. The author's attitude to Igor's campaign. Last modified: 2025-01-23 12:01
Humanity is extremely unevenly distributed over the surface of our planet. For example, in a small Asian state, more people can live than on the whole mainland of Australia. Where is the most populous country in the world located? And why is she interesting?. Last modified: 2025-01-23 12:01
Today, mankind uses a wide variety of combustible substances. There are already quite a few types of them and they all have some kind of their own, unique characteristics. What are these substances? This is the raw material that can continue to burn after the source of ignition has been removed. Last modified: 2025-01-23 12:01
When the word "cleanliness" is used, some represent sparkling white plumbing, others - doctors in surgical gowns. And of course, everyone remembers the Tide ad! However, the concept of purity is much more multifaceted than it seems at first glance. Last modified: 2025-01-23 12:01
Today we'll talk about what attracts many, of course, if people like sweets. Dessert is something that no self-respecting feast can do without. And there must be something at the end of the program. But it was not the recipes that got into the zone of our attention, but the meaning of the word. Last modified: 2025-01-23 12:01
Among the many sights of Krasnoyarsk there is this: Krasnoyarsk Cadet Corps named after A.I. swan. It has been functioning for almost twenty years and annually produces many boys who dream of military service. Like any educational institution, it has its own characteristics. Last modified: 2025-01-23 12:01
Amanita mushroom belongs to the fly agaric family. The peculiarity of this species is paradoxical - outwardly beautiful, it will certainly turn out to be poisonous. And the mushroom, the use of which does not pose any danger to human life and he alth, will be characterized by an unsightly appearance, so to speak, unappetizing. Last modified: 2025-01-23 12:01
The microscopic structure of the kidney organ is very complex. These are tubular glands that have their own constituent elements - nephrons. In one kidney, there are about one million of them. Last modified: 2025-06-01 07:06
Today we will talk about the location of human organs. It is worth noting that anatomy is a rather fascinating subject (not only for medical personnel). Interest in this fascinating issue at least once in a lifetime wakes up every person on our planet. Last modified: 2025-01-23 12:01
Phosphorus and its compounds: characteristics, examples. Physical and chemical properties of phosphorus. Allotropic modifications, their characteristics. Oxygen-containing organic compounds of phosphorus. Importance and use of phosphorus in industry, biological role. Last modified: 2025-01-23 12:01
Bacteria is a concept familiar to everyone. Getting cheese and yogurt, antibiotics, sewage treatment - all this is made possible by single-celled bacterial organisms. Let's get to know them better. Last modified: 2025-01-23 12:01