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Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, ... Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up.It is an ångström, a unit of length commonly used in chemistry to measure things like atomic radii and bond lengths. Although not an official SI unit, it has a simple relationship to the metric units of length: 1ångström = 1Å =10−10 m = 0.1nm = 100pm. 1 å n g s t r ö m = 1 Å = 10 − 10 m = 0.1 n m = 100 p m. The angstrom was intended ...The covalent bond is the electrostatic interaction between two atoms in the same molecule. Covalent bonds are much stronger than hydrogen bonds: the O−H O − H has a strength of 467 kJ/mol, while the hydrogen bond is usually between 4 to 40 kJ/mol. Just want to point out that there is a subtlety to the word "water": Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.Aug 12, 2017 · I was looking for the pKa p K a of imidazole and found this pKa p K a table [1]: Compound Imidazolium 2-Aminoimidazolium 1-Methyl-2-aminoimidazolium 4,5-Dimethyl-2-aminoimidazolium pKa 7.38 8.46 8.65 9.21 Compound p K a Imidazolium 7.38 2-Aminoimidazolium 8.46 1-Methyl-2-aminoimidazolium 8.65 4,5-Dimethyl-2-aminoimidazolium 9.21.

Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.5. Yes every reaction is an equilibrium. A complete reaction is a equilibrium with high equlibrium constant. If you write the expression for equilibrium constant, you will find that high equilibrium constant implies that the conc. of the products is very high, i.e. the reaction has reached completion. Share.

Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.

Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.4. Computational chemistry is a broad field, even more nowadays with increasing number of machine learning applications related to chemistry. As you have not specified what you are after I will suppose you are interested in quantum chemistry because it is arguably the main area of study in computational chemistry. I would …Here is how I understand it, armed with the new knowledge contained within the posts above: In the phosphate ion we have a central Phosphorus atom, with five valence electrons. This is bonded to four oxygen atoms, which have six valence electrons. Five P electrons plus 4 times 6 O electrons gives 29 electrons. Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.Pura Vida Bracelets have become a popular accessory among fashionistas and trendsetters. These unique handmade bracelets are not only stylish but also support artisans in Costa Rica. If you’re wondering how to style and stack Pura Vida Brac...

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In a comment on the question I previously asked in Chemistry Stack Exchange, I was told that these other determinants have just different occupied orbitals. But then they are excited states and should already be included in the normal multi-configurational ansatz (CISD for example).

25. asked 2 days ago. -3 votes. 1 answer. 61 views. Should every downvoted answer be flagged and subsequently removed [duplicate] Questions are asked and answered …Chemistry Stack Exchange is moderated by you. Review queues contain posts (also known as review tasks) that might need community attention, as determined by the …The AgX+ A g X + ion and the ClX− C l X − ion are close to the same size (with the silver ion being smaller), so they can approach each other quite closely. In silver nitrate, the NOX3X− N O X 3 X − ion is larger and does not allow as close an approach as the chloride ion, so the bond is weaker, easier to break up, and the salt is more ...Place 2.5 g 2.5 g 30-mesh powdered sample of arecoline nut in distillation flask. Add 5 mL 5 m L 0.3 N 0.3 N NaOH N a O H solution and wet sample uniformly. Place receiver containing 10 mL 10 m L 0.02 N 0.02 N HX2SOX4 H X 2 S O X 4 in ice bath, with stem of condenser dipping in acid. Connect apparatus and let steam bubble through material.Cross-posting is not considered the correct way to go on Stack Exchange. Or anywhere on the internet, to be a little more precise. The idea is that you want all answers to be in a single common spot, so the best answer out of different alternatives can be easily identified by votes.Place 2.5 g 2.5 g 30-mesh powdered sample of arecoline nut in distillation flask. Add 5 mL 5 m L 0.3 N 0.3 N NaOH N a O H solution and wet sample uniformly. Place receiver containing 10 mL 10 m L 0.02 N 0.02 N HX2SOX4 H X 2 S O X 4 in ice bath, with stem of condenser dipping in acid. Connect apparatus and let steam bubble through material.Stack Exchange. Want to start your own Stack Exchange Q&A site? Check out Area 51. Our friendly robots are waiting. We make Stack Overflow and 170+ other community-powered Q&A sites.

Chemistry Stack Exchange uses MathJax to render LaTeX syntax. You can use single dollar signs to delimit inline equations, and double dollars for blocks: The equation $ 3x^2 + 5x +1 = 0 $ has the solutions $$ x_{1,2} = \frac{-5 \pm \sqrt{5^2-12}}{6} $$ Learn more: MathJax help.Niobium is a chemical element with atomic number 41 and is represented with the symbol Nb in the Periodic Table. It is a soft, ductile transition metal which is resistant to corrosion due to the presence of an oxide layer on its surface. It is one of the most common elements found in the Earth’s Crust. It is often found in the pyrochlore mineral.4. There are two ways to think of charge separation and both make resonance structures less stable: Moving electrons from a bond to a single atom to generate a cation/anion pair. For example: RX2C=CH−CH=CRX2 RX2C=CH−C+H−C−RX2 R X 2 C = C H − C H = C R X 2 R X 2 C = C H − C + H − C − R X 2.the quality and relevancy of your questions and answers. These friendly reputation leagues are an informal way of tracking your reputation within the community …The negative hyperconjugation is a type of resonance effect where there is a donation of electron density from a filled π- or p-orbital to a neighboring σ*-orbital. It does not occur in your molecules. According to me, while comparing acidic strength, we should remove H X + from both the compounds, hence we get C F X 3 − O X − and C C l X ...Some Fortran use is because of performance. The language was designed to be: especially suited to numeric computation and scientific computing. Many times, I find chemistry coders sticking to Fortran because they know it and have existing highly optimized numeric code-bases.For those who may be interested and looking for a list of 'Known (LaTeX) Chemistry Packages', there is an excellent, albeit a bit dated by internet standards (appears to be ~9 years old) summary of chemistry related LaTeX packages: "This is intended to be a complete list of chemistry related LaTeX packages. Still — nobody is perfect.

Yes , it is a scam . This has been discussed at National Association of Corrosion Engineers meetings for decades. The vendors have actually sold some to refineries; however they can never demonstrate good results in objective tests. The excuses the vendors find for the failures are a tribute to creative thinking. – blacksmith37.Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. Sign up to join this community

The expansion upon freezing comes from the fact that water crystallizes into an open hexagonal form. This hexagonal lattice contains more space than the liquid state. Share. Cite. Improve this answer. Follow. answered May 13, 2015 at …From chemistry stack exchange, an answer contributed by user R.M.: SMARTS is deliberately designed to be a superset of SMILES. That is, any valid SMILES depiction should also be a valid SMARTS query, one that will retrieve the very structure that the SMILES string depicts. Except, that last clause isn't true. Try matching tritium against itself.Amidine synthesis from nitrile and dimethylamine using n-Buli as a base. organic-chemistry. synthesis. amines. organometallic-compounds. nitriles. Mithoron. 4,582. modified Oct 13 at 12:18.Effect of impurities on melting point. This is a 10th-grade question. The melting point of a substance decreases with increase in presence of impurities in it. The melting point of ice decreases from 0 °C to -22 °C on mixing salt in it in proper proportion. That is why salt is added to make freezing mixtures to keep ice creams frozen.Stack TV is a popular streaming service in Canada that offers a wide range of channels and programming options. Whether you’re a sports enthusiast, a fan of drama series, or someone who enjoys watching the latest movies, Stack TV has someth...- Mathematics Stack Exchange. Quantum Chemistry book recommendation. [closed] Ask Question. Asked 5 years, 8 months ago. Modified 5 years, 8 months ago. …

The absorption (reduced reflectance) seen at lower wavelengths by silver and gold is caused by an electron transition (caused by the absorption of light) between their 4d → 5s 4 d → 5 s and 5d → 6s 5 d → 6 s orbitals respectively. Silver absorbs (reflects less) in the ultraviolet, no visible light is appreciably absorbed.

Acidimetry is the specialized analytic use of acid-base titration to determine the concentration of a basic (synonymous to alkaline) substances using standard acid. Alkalimetry, is the same concept of specialized analytic acid-base titration, but for an acidic substance using standard base. – Poutnik. May 14 at 14:00.

Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Visit Stack Exchange.It is an ångström, a unit of length commonly used in chemistry to measure things like atomic radii and bond lengths. Although not an official SI unit, it has a simple relationship to the metric units of length: 1ångström = 1Å =10−10 m = 0.1nm = 100pm. 1 å n g s t r ö m = 1 Å = 10 − 10 m = 0.1 n m = 100 p m. The angstrom was intended ...39. The inert pair effect describes the preference of late p-block elements (elements of the 3rd to 6th main group, starting from the 4th period but getting really important for elements from the 6th period onward) to form ions whose oxidation state is 2 less than the group valency. So much for the phenomenological part.The expansion upon freezing comes from the fact that water crystallizes into an open hexagonal form. This hexagonal lattice contains more space than the liquid state. Share. Cite. Improve this answer. Follow. answered May 13, 2015 at …From our friends teaching organic chemistry at UCLA: R group: An abbreviation for any group in which a carbon or hydrogen atom is attached to the rest of the molecule. Sometimes used more loosely, to include other elements such as halogens, oxygen, or nitrogen. R is an abbreviation for radical, when the term radical applied to a …Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations.Find the latest and most popular questions about chemistry as an academic discipline and programs. Browse topics such as admissions, grading, publications, funding, and more.CH3 radical is Sp2 hybridised carrying the lone electron in a pure p orbital. This is so because Sp2 hybridised orbitals are lower in energy than Sp3 hybrid orbitals (The more the S character the lesser is …5. Hyperconjugation is the interaction between adjacent orbital (empty p p for cation, π π for alkene) with σ σ bond, while common conjugation is between adjacent orbital and π π bond. As one example, one reason why more alkyl substituted alkenes are more stable than less substituted ones is because more alkyl groups provide more ...

The chemistry is fairly simple: N a H C O X 3 84 g + H C l 36 g N a C l + H X 2 O + C O X 2 f i z z. You can make a dilute baking soda solution as well and add slowly with stirring. Just keep adding until it no longer fizzles, then test with pH paper. Repeat.Are you considering subscribing to Hulu and wondering what channels are included in their lineup? With the rise of streaming services, it’s important to compare the channel offerings before making a decision.Aug 22, 2015 · Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. My chemistry book explains that even though electrons in the $\mathrm{2p}$ orbital are closer to the nucleus on average, electrons from the $\mathrm{2s}$ orbital spend a very short time very close ... Stack Exchange Network. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online ...Instagram:https://instagram. who narrates the aspca commercial 2023osrs poh obeliskparking by memorial stadiumhealtquest For those who may be interested and looking for a list of 'Known (LaTeX) Chemistry Packages', there is an excellent, albeit a bit dated by internet standards (appears to be ~9 years old) summary of chemistry related LaTeX packages: "This is intended to be a complete list of chemistry related LaTeX packages. Still — nobody is perfect.Nov 28, 2019 · Now, coming to indium oxide, the formula of this compound as stated here is InX2OX3 I n X 2 O X 3, which bears a resemblance to the formula of AlX2OX3 A l X 2 O X 3 and GaX2OX3 G a X 2 O X 3 which we stated above. So, I would expect this oxide to atleast have some amphoteric properties. narrowing the topicplus size womens renaissance clothing Monoatomic Gold acts upon the pituitary gland, inducing an increase in hormonal production, and is thus a rejuvenation agent. Monoatomic Gold strengthens the heart, improves the production of red blood cells in the bone marrow and increases the production of semen... It can be manufactured alchemically out of 24carat metallic gold... avon collectibles on ebay Jun 7, 2015 · Thanks for contributing an answer to Chemistry Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience. Use MathJax to format equations. Feb 10, 2014 · 5. Hyperconjugation is the interaction between adjacent orbital (empty p p for cation, π π for alkene) with σ σ bond, while common conjugation is between adjacent orbital and π π bond. As one example, one reason why more alkyl substituted alkenes are more stable than less substituted ones is because more alkyl groups provide more ...