Compounds Definition and 236 Threads

I was trying to understand why some compounds appear colorless (transparent) and tried to give an explanation. I take benzene as an example: it is a chromophore group in which there is π-conjugation, so a certain energy gap is generated between HOMO and LUMO. This energy gap is such that in...

Why do some compounds, such as amides, ketones, aldehydes, ethers, behave neither as acids nor as bases in water? Does it depend on the difference between the pKa/pKb of water and the pKa/pKb of the compounds themselves?

The "sleep hormone" melatonin, sold at health supplement stores, has been found to prevent radiation sickness from ionizing radiation: https://pubmed.ncbi.nlm.nih.gov/30073934/ There are also some other references for this findable with a Google search. But you don't want to be on melatonin...

Hi Please can anyone explain why Naphthalene is soluble in liquid Ammonia when Naphthalene is Non-polar and Ammonia is Polar?

We know cobalt is a magnetic material, it can attracted by magnet. Now if we want to know for example cobalt oxide (co3o4) has magnetic property or not what we should do? I mean is there a role to know bonding of cobalt with which elements results in magnetic property? or is there any online...

I am actually studying engineering but we are making a project about chemistry, and i don`t know much about it. I need chemical compounds that i can visualise. For example water. need help [Thread moved from the technical forums to the schoolwork forums by the Mentors] [...and thread contents...

It is very important to recognize that, in general, the rules of the nomenclature of organic compounds are written in terms of classical valence bonding and do not imply electronic configurations of any kind. [Mentor Note -- Representative link added below]...

I think the correct ans should be c (i.e C>D>A>B ) but its given d in my textbook( There can be a error also but I'm sure) I think C should have the highest basic strength since Hybridisation of N in this is Sp3 so it has the least electronegativity so it can donate its lone pair easily Then it...

I'm a mechanical engineer, and I've been assigned to test a series of bio-lubricants. The problem is, the person by whom I was assigned those tests backd off from our collaboration, and we were supposed to write a paper together. The tests are done, my time was wasted and here comes the problem...

I'm trying to fortify my understanding of aromaticity in heterocyclic compounds. I understand that every atom in an aromatic compound must be sp2 hybridized (I don't like the "conjugated" definition), which is easy to spot for carbon, but how do I determine it for atoms such as nitrogen, oxygen...

How would I name the following two compounds? My guess is that the first one would be 3-bromophenyl 1-chloro ketone and the second one (4Z)-3-sec butyl-hex-4-en-1-yne. Am I correct? Thank you

mx remets to mass in gram of the compost x nx remets to moles of the compost x nTot remets to the total moles x remets to the additional moles of D2 I considered the molar mass: MH2 = 2u MHD = 3u MD2 = 4u 10 = mH2 + mHD + mD2 10 = nH2*2 + nHD*3 + nD2*4 10 = nTot + 0.9nTot + 0.8nTot nTot =...

According to me Option A is a correct option because as the energy difference between two atomic orbitals increases, their interaction, and thus the value of E (or E*) decreases. Here, E is the energy difference between the bonding molecular orbital and the atomic orbital of lower energy , while...

I don't really have any idea how to approach this, but the answer says that it is the compounds which are more basic than ammonia liberate it.

I am doing some theoretical free-lance work on prospects of chemical rocket fuels with unusually high heating values and specific impulses. One of my latest interests is prospects for using fuels with molecules made of one carbon atom and 5 or more hydrogen atoms. Specific examples I am...

Name: Iron (III) oxide C: Fe+3 A: O-2 My work** Should this be separated just like this for the first step?

Am I doing this correctly? Compound 1 Mass percentage of nitrogen 64.17 Atomic mass of nitrogen 14 Compound 1 Mass Percentage of oxygen 35.73 Atomic mass of oxygen 16 Number of moles 64.17/14 = 4.58 35.73/16 = 2.23 Compound 2 Mass percentage of nitrogen 47.23 Atomic mass of nitrogen 14...

when we transfer water vapours from steam generator isn't it like that the pressure of atmosphere around the organic mixture will increase so we have to boil the organic mixture more so as to make equal the pressure of atmosphere which is water vapour pressure + pressure of atmosphere is equal...

Which HPLC column can separate high polar compounds?

Hi, I'm trying to find a database in which I could enter a chemical formula and then locate a table of physical properties of that compound (or references). For example, whether the material exhibits magnetism, superconductivity, it's crystal structure, curie temperatures, conductivity, or...

Homework Statement Do ionic compounds such as NaCl and K2O have intermolecular forces? 2. The attempt at a solution I got stuck conceptually. NaCl and K2O are ionic compounds. Their basic unit is formula units. They are not molecular compounds. Ionic compounds are held together by...

Homework Statement I performed a lab that has the main objective of reacting a cobalt(II) chloride solution through a series of steps to achieve the following two compounds: Compound A - Purple - [Co(NH3)5Cl]Cl2 Compound B - Orange - [Co(NH3)6]Cl3 The only difference when performing the...

Homework Statement Name the ionic compounds: a) ##K_2SO_4## b) ##Ba(OH)_2## c) ##FeCl_3## Homework EquationsThe Attempt at a Solution These problems are actually in a sample exercise so I already have the answers, I just am really lost in this section of chemical nomenclature. First, at...

Homework Statement Name the following alcane according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Thank you for helping me! Cro

Homework Statement Name the following compound according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Help me with the answer, please!

Homework Statement Name the following compound according to the IUPAC rules: Homework EquationsThe Attempt at a Solution Comment on my attempt, please.

I have been researching on the bonding energies of different compounds, and for example, for CO2 it is 1600kJ/mole, 1600kJ/44g, or ~36.37kJ/g of energy required to split the carbon dioxide into carbon and oxygen. Furthermore, I transformed the amount of energy required in kJ to degrees celsius...

The Attempt at a Solution Is there some hindrance caused by the π bond in (c)? How do I approach the problem anyway?

Does anyone know of any studies into exactly how much various metals reflect or absorb microwaves with relationship to the microwaves wavelength and ideally theyt compounds too?

Homework Statement Draw the following compounds: a) 3-ethyl-3-methylhexane b) 1-ethyl-3-propylcyclohexane c) 2,4-dimethylheptane d) ethylcyclopentene e) 5-ethyl-2,2-dimethyl-3-heptene f) 3,4-dimethylhexyne g)4,4-dichloropentanal h) 2-methylbutanol i) 3,3-dichlorohexaneHomework Equations...

Homework Statement Name the following compounds. Sorry for the rough structures, I couldn't get them to go on paint better than this for some reason :S Homework Equations none The Attempt at a Solution a) The molecular compound is 2, 3, 5-trimethylhexane b) The molecular compound is 6...

I am not able to understand why compounds have colour. I have read that it is due to excitation of electrons from one atomic/Molecular orbital to another because of which certain wavelengths are absorbed, And we can see the "complementary colour" of those wavelengths. What I don't understand is...

< Mentor Note -- New user has been reminded to use the Homework Help Template when posting schoolwork questions > What is the ratio of the uncomplexed Zn+2 ion in a solution that is 10M in NH3, if the stability constant of [Zn(Nh3)4]+2 is 3x10^9. I am not able to understand why they have given...

Hello , could someone tell me ,where to find Resonant frequency of the chemical bond of the following Volatile organic compounds: Propene,Toluene,Benzene,Ethylbenzene. Thanks in advance .

Hello everybody :) I have a problem understanding the different types of pi -> pi * transition of organic compounds. I can't understand what's the difference between K-band, B- band, and E-bands, and I cannot find any explanation on the internet. Also I don't understand why benzene has two E...

I just had a lab, and the results really aren't adding up to what i expected. And this is specifically about simple distillation, not fractional distillation. Lets say i have a solution of two liquids, one's boiling point is 90°C and the other is 110°C, a 20°C difference which is pretty close...

why on ftir graph there are several peaks for the same compound but at different wavelengths? what causes the different modes of vibration for the same compound (PO4), what causes the v1 ,v3,v4 for PO4... help me please:frown:

1. Homework Statement : please refer to the picture attachedHomework Equations : [/B]A compound is aromatic if it is planar and it satisfies Huckles 4n+2 Π electron rule.The Attempt at a Solution : [/B] Option A is not correct...I don't know why...just speaking from intuition..probably its not...

I understand how angles are calculated in compounds where an atom is bonded to 2, 3, 5, and 6 bonds (bond pair + lone pair). But how do they work out the angle of a compound where an atom has 4 bonds (i.e. methane), in this case the carbon atom, has a H-C-H angle of 109.5°

I'm an amateur chemist, and due to some of my projects I have what I would consider an excess of copper powder. I'm just looking for some interesting or fun things to do with the copper. Note: I do not have access to a furnace.

For example, NaBr can dissolve in water but will it react with water? I apologize if it is an oversimplistic question.

I have seen many instances of molecular formulas of two or more compounds with a dot between two adjacent molecular formulas like CuSO4.10H20, CaCO3.MgCO3, K2SO4.Al2(SO4)3.24H20 and so on. What does the dot indicate?

Hey, So I've got a homework question which is gradually transforming by brain into mashed potato! Here it is.. Identify which of the following compounds contains ions and state the formal charges on the ions: NaCl, N2, MgO, AlCl3, and CO2. Now, I'm not asking for someone to come in and give...

What is the reason that aromatic compounds are more stable than other cyclic compounds ? Please provide answer in reference to MOT theory . Why are anti aromatic compounds so unstable ?

I have tried looking for papers on the composition of earth, but none of them seem to list the abundance of compounds. They just list the elements. So, what are the abundances of the most common compounds, by mass and/or percent of Earth?

Homework Statement The following substances have approximately the same relative molecular mass. Which is likely to have the highest boiling point? Homework EquationsThe Attempt at a Solution I chose E as it has OH so therefore hydrogen bonding. Is this correct? Cheers!

Hello, I want to rank the following compounds in order of basicity: trimethylamine, tetramethylammonium chloride, 4-nitroaniline, aniline, acetanilide, 4-methylaniline. I think this is the order, but I'm not sure for the last ones. trimethylamine > 4-methylamine > aniline > 4-nitroaniline >...

When ionic compounds melt, do their state change or they are chemically changed? Or both? Since the electrostatic forces are overcame?

Homework Statement Name the following molecule by the IUPAC system of nomenclature. Homework Equations There are some rules. To name bicyclic alkanes, you follow these three steps: 1- Count the total number of carbons in the entire molecule. This is the parent name (eg. ten carbons in the...

Two questions: 1. What tools and techniques are typically used to determine and plot spatial distributions of compounds--particularly organic ones--in interstellar dust? 2. Is it presently possible to determine distributions of compounds along arcs distant from the galactic center? If so, can...