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 Заголовок сообщения: Re: Интересные соединения, нехарактерные степени окисления
СообщениеДобавлено: 06 окт 2021 10:57 
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In a compound like mentioned in the question, the bond (C-C) between the methylene carbon and benzene will be weak due to which it isn’t possible. Bypass routes are not possible in such problems. These calculations look more like a theoretical question rather than genuine and natural experiments. In short, the compound and this experiment are unstable.


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 Заголовок сообщения: Re: Закись азота ("веселящий газ")
СообщениеДобавлено: 06 окт 2021 15:45 
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У меня такой вопрос... Колба Вюрца должна быть открыта? :ah:


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 Заголовок сообщения: Re: Как вы начали увлекаться химией?
СообщениеДобавлено: 07 окт 2021 11:36 
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For many, the interest for chemistry developed early in their school stages. This interest then turned into a hobby; to read books about chemistry. Each one of these students various different books to keep their passion for this subject on going. The suggested books to get more involved with chemistry are;
O. Holguin Experiments without explosions
Vasiliga Entertaining Chemistry (Tsikava khimiya)
Pylypenko, Sereda and Co
Pilipenka
Burinskaya

Each one of these books helped the students gain knowledge about this subject and many of the people are now approaching their career in various different fields of chemistry.


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 Заголовок сообщения: Re: Фальсификация реактивов и химических продуктов
СообщениеДобавлено: 13 окт 2021 11:59 
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How can we improve our qualify of life if there is constant Falsification of reagents and chemical products? Soda universal, the product is declared as the "Universal means for cleaning surfaces, washing floors, protecting the washing machine”. It will clarify whether the product has sodium or not and if the product contains potassium chloride, the sodium (soda) present in the mixture will completely clog the pale color of potassium.


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 Заголовок сообщения: Re: Periodic Table. Таблица Менделеева
СообщениеДобавлено: 13 окт 2021 13:02 
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How can we make a periodic table more informative and convenient? To create such a table would surely be time consuming but there are a few things to be kept in mind if you were to make this table;
The characteristics of the element should be sufficient to a limit. Otherwise, the table won’t be convenient to use.
It should not only contain exclusive anions, cations, but also their solubility in various solvents, acids.
It should be specified if an element has no harmful substances but harmful quantities.
Appearance of the table matters so the difference in colours should be made more contrasting.
Density depends on conditions and modification. Hence, all densities should be given under the same conditions.
Keep these points in mind if you want to make yourself a convenient periodic table.


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 Заголовок сообщения: Re: Учебники по химии
СообщениеДобавлено: 04 ноя 2021 11:32 
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All of the books are amazing.
My suggestion is Nature’s Building Blocks: An A-Z Guide to the Elements. The what, why, and wherefore of the elements are explained in this instructive and entertaining book. It is a thorough guide to all the elements that are currently known, arranged alphabetically from Actinium to Zirconium. John Emsley. John brings the material together skillfully and, like the table itself, in an ordered manner, making him a one-stop-shop for the graphic details on each aspect. Emsley gives us a window on a variety of various characteristics for each box on the periodic table by listing each element with sub-headings such as Economic, Health, History, and Environmental, etc. This is an excellent resource to refer to from time to time.


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 Заголовок сообщения: Re: Разные книги
СообщениеДобавлено: 04 ноя 2021 11:46 
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Hey, The book by K. flammorian on meteorology is quite rare. I once found it in my local library but never saw it after that. I even tried to find out its references on the internet but failed badly. This highly praised guidebook remains the classic introduction to meteorology and the atmosphere, its components, issues, and applications. This is explained by using daily, easy-to-grasp examples to reinforce basic principles. Topics covered include ozone depletion, the UV index, temperature, dew point temperature, and orographic impacts, wildfires and weather, thunderstorms and lightning, the record-breaking Florida hurricane season, air pollution consequences, and more. To emphasize the extremely visual character of meteorology, it incorporates top-quality visuals, including new satellite photos and illustrations by award-winning Dennis Tasa.


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 Заголовок сообщения: Re: Поэзия
СообщениеДобавлено: 10 ноя 2021 19:28 
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Зарегистрирован: 02 мар 2013 06:13
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Откуда: Латвия
Вот такие строки недавно придумал))

А я когда то был битником
Ходил с битой, всех бил
А я когда то был битником
Пилюлей всем дарил

_________________
Изображение
Я вам не Курасаки ©
Колi случайно наступив кiту на хвост. ©


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 Заголовок сообщения: Re: Флуд
СообщениеДобавлено: 30 ноя 2021 12:43 
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Это сверхплотное вещество, называемое гексафторидом серы, делает ваш голос низким и демоническим.


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 Заголовок сообщения: Re:Looking for software
СообщениеДобавлено: 23 дек 2021 16:35 
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The GENESYS 10S series spectrophotometers feature USB connections that allow you to:
• Connect to computer for software control, data analysis, and storage
• Use USB memory device to store methods and data in CSV format
• Print hard copy data reports directly to an external printer
When transferring data with specialized hardware on a lower level, it often helps to use a USB 2.0 drive of < 4 Gb capacity formatted to FAT/FAT32. You could try calling Thermo Scientific and ask about a USB data stick for the spectrometer. They sell them for other spectrometers. This way, you can connect it without buying any software.


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 Заголовок сообщения: Re: Английский язык для студентов-химиков
СообщениеДобавлено: 27 дек 2021 11:36 
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Зарегистрирован: 21 дек 2021 10:56
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Hello, you should explain what level of English you would like.
There are multiple books present for the purpose. My suggestion is The Chemist's English, 3rd rev. ed. with "Say It in English, Please!"
The book has been written by Schoenfeld, Robert, and was published in 1989. The book has a very good grasp of the knowledge and topics. Chemists—and Chaucerians—will be informed and delighted by the book's depth of knowledge, common sense, and wit.


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 Заголовок сообщения: Re: Где бесплатно скачать книги по химии
СообщениеДобавлено: 28 дек 2021 12:37 
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Hello, there are a lot of websites on the internet that provide you with the facility of free books. I use the following website for this purpose.
website: https://chemistry.com.pk/free-download-chemistry-books/
You can find a wide range of books on the respected topic here. The books include:
A Guidebook to Mechanism in Organic Chemistry (Sixth Edition) By Peter Sykes
A Complete Book on Periodic Table of the Elements
A Complete Introduction to NMR Spectroscopy By Roger S. Macomber
A Comprehensive Treatise on Inorganic and Theoretical Chemistry Vol II By J. W. Mellor
A Guide to Molecular Mechanics and Quantum Chemical Calculations by Warren J. Hehre
A Handbook of Spectroscopic Data: Chemistry – UV, IR, 1HNMR, 13CNMR and Mass Spectrometry By B. D. Mistry
Electrochemical Methods: Fundamentals and Applications By Allen J. Bard and Larry R. Faulkner
Elements of Environmental Chemistry By Ronald A. Hites
Elements of Physical Chemistry (5th Edition) By Peter Atkins and Julio de Paula
Elements of Physical Chemistry (7th Edition) By Peter Atkins and Julio de Paula
Elements of Organic Chemistry By Isaak Zimmerman and Henry Zimmerman


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 Заголовок сообщения: Re: Водород, опыты с водородом
СообщениеДобавлено: 28 дек 2021 16:21 
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Well, I cannot figure out exactly what you want to demonstrate or why the explosion was not a big bang in nature. But if you really want to repeat this experiment, I will advise you to follow these steps and let me know your results.
Fill a trough with water and place the bottle in position with its bottom well below the water level.
Fill the bottle with water by opening the clip and sucking up water from the trough. Tighten the clip sufficiently to prevent the water level from dropping.
Fill the bottle with hydrogen until bubbles start to escape from the bottom. Shut off the hydrogen supply and move it away
Raise the clamp holding the bottle so that the trough can be slid away. Re-tighten the clamp.
Light a splint and, holding it in one hand, remove the rubber tubing and clip from the bottle with the other hand.
Ignite the hydrogen that is escaping from the top and step back from the bottle.
The gas should burn with a flame, which may be yellow at first, then turn blue.
After about 20 seconds, the flame will decrease and appear to go out.
Shortly there will be a loud explosion.


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 Заголовок сообщения: Re: Серебро, золото, платиновые металлы (химия, выделение)
СообщениеДобавлено: 29 дек 2021 10:17 
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Silver’s reaction with nitric acid is a common experiment which we see and observe during our chemistry lab sessions. Moreover, such a reaction produces not only the silver nitrate but also nitrogen as well as water. Silver reacts with nitric acid in what is known as a redox reaction. However, since you are asking about the color of the final solution, let us consider the equation of this chemical reaction.
Ag + HNO3 → AgNO3 + NO2 + H2O
In this reaction, silver is oxidized to +1 oxidation state of silver. Meanwhile nitric acid is reduced to +4 oxidation state (nitrogen dioxide) from +5 oxidation state. Moreover, in the following reaction, the resulting nitrogen dioxide has a brown color. But this color does not resemble that of the complete chemical reaction. Rather silver nitrate alone as the result is colorless in nature. Another key thing to note is that silver does not react with other elements since it is not reacting in nature. However, dilute nitric acid carries oxidizing characteristics which make silver begin a reaction phase in conjunction. And this results in a redox reaction which is also known as oxidation-reduction reaction.


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 Заголовок сообщения: Re: Кобальт, Никель и их соединения
СообщениеДобавлено: 29 дек 2021 12:24 
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I am looking that you seem to be conducting small little experiments regarding cobalt sulfate. I actually cannot predict what the cause of the results you had with your experiment. But there is a good thing or two which I am about to share with you. If you are really looking for an experiment involving cobalt sulfate, here are a few of them for you.
Cobalt (II) gives a green precipitate with ferrocyanide and a dark red/ purple precipitate with ferrocyanide. The green precipitate cannot be converted to the red one by means of oxidation by hydrogen peroxide, but another, dark blue, compound is formed.
A solution of cobalt (II) acetate is hydrolyzed when the solution is heated. When the liquid cools down again, then the effect is reversed again. The visual result is formation of a precipitate on heating and the slow re-dissolving of the precipitate on cooling down.
Copper (II) ion and iron (III) ion form complexes with acetyl acetate in an aqueous solution. Cobalt does not form a complex, at least not visibly.
When hydrated sulfate-salts are heated, which only lose water, then their properties strongly change. The color changes, but also the solubility properties change a lot. The sulfate salts lose water easily, but no acid (H2SO4 or SO3).


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 Заголовок сообщения: Re: Химия комплексных соединений; Хелаты
СообщениеДобавлено: 29 дек 2021 17:20 
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Chelation of Magnesium:
Chelated magnesium is in a form that is easily absorbed by the body. Chelated magnesium is used as a supplement to maintain adequate magnesium in the body. It may also be used for purposes not listed in this medication guide. You should not use chelated magnesium if you are allergic to it, or if you have kidney disease. Ask a doctor or pharmacist if it is safe for you to use this product if you have other medical conditions, especially:
Diabetes
Crohn's disease
If you are malnourished
If you drink large amounts of alcohol
And this is how to take up chelated magnesium:
Take chelated magnesium with a full glass of water.
Use chelated magnesium regularly to get the most benefit.
Call your doctor if you have signs that your magnesium blood levels are too low, such as confusion, uneven heart rate, jerking muscle movements, and muscle weakness or limp feeling.
While using chelated magnesium, you may need frequent blood tests. Your kidney function may also need to be tested. Follow your doctor's instructions.
Store at room temperature away from moisture and heat.
Overdose symptoms may include:
Numbness or tingly feeling in your face
Limp muscles
Slow heartbeat
Weak or shallow breathing
Vomiting
Fainting


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 Заголовок сообщения: Re: Нуждаюсь в совете
СообщениеДобавлено: 30 дек 2021 12:52 
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Ethanol is not ordinary or a single-purpose element or a substance. Rather it has effects and help in both the right as well as the bad ways. In short, you will find ethanol in most of your alcoholic drinks as well as a few drugs. Whereas its positive uses also exist in the form of fuel for your car. This either in the form of pure ethanol or through a mixture with petrol. But here is how to increase its concentration on your own.
There is a published research article which explains the increase of ethanol concentration. Ethanol concentration and fermentation productivity using Saccharomyces cerevisiae were substantially increased in shake flask cultures with a normal inoculum by combining 3 methods:
By making nutrient additions to the standard medium for ethanol production
By immobilizing the cells in alginate beads
By using a glucose step-feeding batch process
Ethanol concentration by free yeast was improved from 5.9% (w/w) to 9.6% (w/w) when a further 0.8% yeast extract and 1% animal peptone were added to the standard 30% (w/v) glucose nutrient medium. This was further increased to 12.8% (w/w) by using alginate immobilized yeast. The ethanol concentration was increased again, to 15.0% (w/w) by using the glucose step-feeding batch process.


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 Заголовок сообщения: Re: Поиск книг (Книги, которые хотелось бы иметь)
СообщениеДобавлено: 04 янв 2022 11:13 
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Hydrogen chloride is released into the atmosphere as gas will undergo wet and dry deposition and will be readily incorporated into cloud, rain, and fog water. It thus forms a component of acid rain. It also contributes to the processes that cause photochemical smog. There are many examples in both the U. S. and Europe of the corrosive effects of acid rain on sculptures. Many sculptures have been destroyed, a few have been preserved by bringing them inside. Although there is a factual understanding that within the room, there was no acid rain of course. But since hydrochloric acid is itself dangerous for everything including the structures, humans, and marbles too hence a computer carries no weightage. Upon leakage, it flew to the nearby computer rooms and entered the large components through porous gaps. But I do believe not only did the things fall off easily but they would be in pretty shape too. This is common in the demonstration of adverse effects of HCl that it does not leave any stone unturned in mass destruction. The sculptures for example in the US, you can easily see what happened to them. It actually presents a terrifying look to the world.


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