How iodine is indicated in chemistry. Iodine (chemical element)
Saint Petersburg State Budgetary educational institution middle vocational education `Petrovsky College`
Nearest colleges
At the moment, the College of Food Technologies has trained over 20 thousand skilled workers, and a team of engineering and teaching staff has been formed, largely consisting of graduates; have developed their own traditions of training workers; achieved high level professional skill in working with students and trainees from industrial training masters and teachers. Currently, our graduates are competitive in the labor market and have the opportunity to choose a place of work, or can continue their studies in higher educational institutions.
The St. Petersburg College of Architecture and Civil Engineering was founded on November 29, 1908 by the civil engineer Mikhail Alekseevich Shummer. Today the college employs 85 highly qualified teachers. Over the years, the college has trained more than 32 thousand professionals who are successfully working in design and construction organizations, architectural workshops and design studios in St. Petersburg, Russia and other countries.
St. Petersburg Medical and Technical College of the Federal Medical and Biological Agency is widely known not only in Russia, but also abroad, thanks to its teachers and students - experienced and highly qualified specialists. Until recently, the college remained the only one, and at the moment it is the leading secondary specialized college in Russia educational institution for the training of specialists in medical optics. Nonresident students have the opportunity to settle in a comfortable student hostel, which is located in one of the most famous and beautiful suburbs of St. Petersburg - in Peterhof.
St. Petersburg State Budgetary Professional Educational Institution "Petrovsky College"
Question
Hello! Next year I want to go to your college on the basis of the 9th grade as a designer. Do I need to pass certain exams for admission?
Answer
When entering the Petrovsky College for the specialty "Design", you must pass an entrance test in drawing. Explanatory note by organization entrance examinations according to the picture posted on the college website.
Question
Hello! This year we want to enter your college for the specialty "Programming in computer systems". I am interested in several questions: 1. What is the passing score of the certificate? 2. Is a hostel provided for this specialty (I am from Krasnodar)? Thank you in advance for your answer!
Answer
When submitting documents, it is calculated average score of the applicant's certificate. Enrollment is carried out in descending order of points until the allocated places are filled. The Petrovsky College website contains a table of passing scores of certificates based on the results of college admission in 2017 and 2018. Petrovsky College has a hostel, but places are provided for applicants entering only the specialties "Shipbuilding" and "Welding".
Question
Hello! What is the passing score for the specialty "Stylistics and the art of visage"?
Answer
The passing score is not set in advance. For admission to the Petrovsky College on the specialty 43.02.03 "Stylistics and the art of visage" you need to take an entrance exam in drawing according to the credit system. The applicants who pass the exam are ranked according to the average score of the certificate. Enrollment is carried out in descending order of points until the allocated places are filled
Question
Good afternoon! What is the average score in the specialty 09.02.07 " Information Systems and programming, Programmer qualification "and what is the passing score for the specialty 54.02.01" Design in culture and art "(based on 9th grade)? And also, is it possible to study in these two specialties on a budget?
Answer
In 2018, Petrovsky College took into account the average score of the certificate as a whole, according to which it ranked the lists of applicants entering the specialty without entrance exams and after receiving credit for creative and professional tests. To enroll, you must submit to admissions committee package required documents and the original of the certificate. Enrollment was carried out in descending order of the average score in the ranked lists of applicants until the budget places were completely filled. For those enrolled in budget places on the basis of 9 grades for the specialty 09.02.07 "Information systems and programming (programmer)" the average score of the certificate was not lower than 4.3, and for those enrolled in the specialty 54.02.01 "Design (by industry) (Design in culture and art ) "- not less than 4.2.
Iod (trivial (common) name - iodine; from ancient Greek ἰώδης - "violet (violet)") - an element of the 17th group of the periodic table of chemical elements (according to the outdated classification - an element of the main subgroup of the VII group), the fifth period, with atomic number 53. It is designated by the symbol I (Latin Iodum). Reactive non-metal, belongs to the group of halogens.
The simple substance iodine (CAS number: 7553-56-2) under normal conditions is black-gray crystals with a violet metallic luster, easily forms violet vapors with a pungent odor. The molecule of the substance is diatomic (formula I 2).
History
iodine was discovered in 1811 by Courtois in seaweed ash, and from 1815 Gay-Lussac began to regard it as chemical element.
Name and designation
The name of the element was proposed by Gay-Lussac and comes from ancient Greek. ἰώδης, ιώο-ειδης (literally "violet-like"), which is associated with the color of the steam, which was observed by the French chemist Bernard Courtois, heating the mother brine of seaweed ash with concentrated sulfuric acid. In medicine and biology, this element and a simple substance are usually called iodine, for example, "iodine solution", in accordance with the old version of the name that existed in chemical nomenclature until the middle of the 20th century.
In modern chemical nomenclature, the name iodine is used. The same situation exists in some other languages, for example in German: the common Jod and the terminologically correct Iod. Simultaneously with the change in the name of the element in the 1950s, the International Union of General and Applied Chemistry changed the symbol for the element J to I.
Physical properties
iodine under normal conditions is a solid black-gray substance with a metallic luster and a specific odor. The vapors have a characteristic violet color, just like solutions in non-polar organic solvents, for example, in benzene - in contrast to a brown solution in polar alcohol. iodine at room temperature is a dark violet crystals with a faint luster. When heated at atmospheric pressure, it sublimes (sublimes), turning into violet vapors; when cooled, iodine vapors crystallize, bypassing the liquid state. This is used in practice for the purification of iodine from non-volatile impurities.
Chemical properties
iodine belongs to the group of halogens.
Forms a number of acids: hydroiodic acid (HI), hypoiodic (HIO), iodic (HIO 2), iodic (HIO 3), iodic (HIO 4).
Chemically, iodine is quite active, although to a lesser extent than chlorine and bromine.
1.Iodine with light heating interacts vigorously with metals, forming iodides:
Hg + I 2 \u003d HgI 2
2.Iodine reacts with hydrogen only when heated and not completely, forming hydrogen iodide:
I 2 + H 2 \u003d 2HI
3. Atomic iodine is an oxidizing agent that is less strong than chlorine and bromine. Hydrogen sulfide H 2 S, Na 2 S 2 O 3 and other reducing agents reduce it to ion I -:
I 2 + H 2 S \u003d S + 2HI
4. When dissolved in water, iodine partially reacts with it:
I 2 + H 2 O ↔ HI + HIO, pK c \u003d 15.99
