What is Compounds: Definition and 236 Discussions

Carbon compounds are defined as chemical substances containing carbon. More compounds of carbon exist than any other chemical element except for hydrogen. Organic carbon compounds are far more numerous than inorganic carbon compounds. In general bonds of carbon with other elements are covalent bonds. Carbon is tetravalent but carbon free radicals and carbenes occur as short-lived intermediates. Ions of carbon are carbocations and carbanions are also short-lived. An important carbon property is catenation as the ability to form long carbon chains and rings.

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  1. T

    Difference between optically active and inactive compounds

    Any polarised light's plane is shifted while passing from one medium to another for refraction. So, optically active or not, a solution of any compound will cause refraction because of its density. Then what's special in an optically active compound?
  2. Conservation

    Interesting compounds with alcohol functional group

    I'm looking for examples of some interesting compounds that contain alcohol functional group (please, no joke suggestions about various liquor). Bonus points for creativity/thinking-outside-the-box. Thanks.
  3. 24forChromium

    What determines the colour of chromium compounds?

    I am aware of the processes through which cations are coloured in ligand complex (splitting of incomplete d-shell will absorb specific frequencies of the spectrum). However, I am only aware of this interaction with aqueous mono-atomic cations, which is not always a present condition when colours...
  4. B

    Are molecules only held together by Covalent bonds?

    Hi there, I'm studying for IGCSE Chemistry and I'm a little confused with Bonding/Molecules. My textbook says: "Molecules are held together by covalent bonds" I'm a little confused by this as I thought a molecule was formed when two or more atoms (same or different elements) join together...
  5. Suraj M

    NiF₆ Complexes: Diamagnetic or Paramagnetic? Hybridization States Explained

    Homework Statement Could anyone tell me if [NiF₆]2- and [NiF₆]4- are diamagnetic or paramagnetic? And also their hybridization states? please? Homework EquationsThe Attempt at a Solution well i thought F is a weak ligand and hence a high spin complex formed, but i read a few places where it...
  6. Priyadarshini

    What is the IUPAC nomenclature for the given aromatic compound?

    Homework Statement Give the IUPAC nomenclature of the following compound (in the attachment) (sorry, i don't know why the picture has become upside down!) The Attempt at a Solution Shouldn't the answer be 1-phenyl-2,3-dibromopentane? The book says it is 2,3-dibromo-1-phenylpentane.
  7. N

    Interesting inter-conversions of carbon compounds

    Homework Statement CH2=CHCHCH3 + X --> CH3CHClCH2CH3 CH3CHClCH2CH3 + KOH(aq) --> Y then what is the structural formula of Y ?? (show clearly where the functional group located)The Attempt at a Solution It is obvious that X is HCl, and Y should be an alcohol but where is the hydroxyl group be...
  8. AdityaDev

    Alkylation of Imines: achiral to chiral compounds

    I found this in "March's Advanced organic chemistry" After that step, on using HCl in pentane, you will get 4-methyl-3-Heptanone. So this method was used to convert achiral 2-pentanone to a chiral compound, by first converting it to the compound on left by addition reaction and then using a 2...
  9. mooncrater

    Colours of some mercuric compounds

    Homework Statement While reading my textbook I found that ##Hg(NH_2)Cl.Hg## was given of black colour , whereas ##Hg(NH_2)Cl## of white colour.So is this correct? Homework Equations None The Attempt at a Solution I googled about ##Hg(NH_2)Cl## . It is ##white ## in colour . But I am not sure...
  10. gracy

    Water molecule in chemical formulas of inorganic compounds

    In chemical formulas of various inorganic compounds there are molecules of water .I wanted to know is it important to remember the number of moles of water in chemical formulas of inorganic compounds.
  11. gracy

    Inorganic compounds and their common names

    I have an extensive list (glossary)of inorganic compounds and their common names,I have to memorize all of them.I am really having hard time.Systematic names are easy to follow and remember but what to do for common names?The glossary contains 30-40 compounds and their common names for each...
  12. Emmanuel_Euler

    Does Sulfuric Acid React with All Organic Compounds? A Focus on Alkanes

    Is sulfuric acid reacts with all organic compounds?
  13. gracy

    "features of covalent compounds"

    In the subheading "features of covalent compounds" what that means glucose(less solid) and sugar (more solid) Please guide me.
  14. K

    Acidity in organic compounds and hybridization

    Homework Statement Label the acid hydrogen in each of the following compounds and arrange them in order of increasing acidity and explain the trend. Homework Equations N/A The Attempt at a Solution I'm not quite sure what the question means by "label" the acidic hydrogen but I believe...
  15. AdityaDev

    How is the Electron Configuration of Central Atoms in Complex Salts Determined?

    I am confused with the electron configuration of central atoms in complex salts eg. ##[Fe(CN)_6]^{2-}## configuration just Fe atom is Now the complex is low spin so the configuration becomes, Now we have 6CN. where will they donate their electrons? Will the donate electrons in the remaining...
  16. T

    List compounds in order of increasing melting point

    Homework Statement The Attempt at a Solution My answer was C but the correct answer is A. My reasoning is that they are all bonded to chlorine, so the further away the element is from chlorine on the periodic table, the more ionic the compound is and the higher the melting point is. The...
  17. L

    Why are interstitial compounds tough to melt like Ti-c?

    why are interstitial compounds tough to melt like Ti-c?
  18. gracy

    Difference between mixtures and compounds

    i know in mixture two or more substance are not chemically bonded whereas in compounds substance are chemically bonded and also in mixtures substance can be separated by mechanical method but not compounds But i want to ask how can i identify whether substance is mixture or compound if it comes...
  19. minimario

    Naming Compounds: How to Write (NH4)+ Al3+ SO4 2-

    How do you name compounds such as Ammonium Aluminium Sulfate? It should first be (NH4)+ then Al 3+ and SO4 2-, but how do you put then together? How do you know it is NH_4 AL (SO_4)_2 instead of, say, (NH_4)_3 Al (SO_4)_3 ? Thanks!
  20. F

    Define Organic Compounds As Polar Or Nonpolar

    1.Which of the following compounds are nonpolar? 1) decene 2) decanal 3) 3-methyl-2-decene 4) 1,2-pentanediol 5) cyclohexanol Select one: a. 1,2 and 3 only b. 1 and 2 only c. 3,4 and 5 only d. 1,2,3 and 5 only e. 1 and 3 only 2. Which of the following compounds are polar? 1) 2-butyne 2)...
  21. N

    Compare rate of reaction of organic and inorganic compounds

    I want to ask the rate of reaction of organic compound is slower or higher than that of inorganic compound?? I have found an ansswer like that : The organic paricles are molecules. Because of strong covalent bonding within the molecule, organic compounds do not readily react. Reactions...
  22. A

    Acidity of compounds with oxygen-Nucleophility

    Rank the following in terms of decreasing nucleophility: CH3CO2- CH3OH CH3O- CH3CO2H NC- For compounds with oxygen, basicity parallels nucelophility. I attached answer from the book. Now, what I want to understand, is why CH3CO2H is more basic than CH3OH? I also attached the only pKa values...
  23. N

    Rotation of PPL by opticaly active compounds (mathematical feeling)

    i read formulae in textbook : [α]λt°C = Θ/L*C ...(i) where Θ is rotation in light and L is length of tube and C is concentration in gm/litre if we consider tube of lenth L and cross section area 'A' then C= M/A*L M is mass of sample so (i) becomes [α]λt°C = Θ/[M/A] so are...
  24. G

    Molecular vs ionics compounds, H20

    I have read previous topics, but still the difference in compounds is not clear to me. As far as I understood, molecular compounds are made of covalent bonds, while ionic compounds by ionic bonds. I understand why Mn2O3 is ionic compound, because neutral Mn and O would make only MnO IN CASE...
  25. B

    How Do You Calculate pH in Titration of Dibasic Compounds?

    Homework Statement For the titration of 50.0 mL of a 0.100 M solution of a dibasic compound with 0.0500 M HCl, calculate the pH at 100mL (equivalence point) and at 145 mL. pka1=2.46 pka2=9.41 Homework Equations (1)pH=pka + log[BH+]/[BH2+] (2)[h+]=sqrt((K1K2F)+(K1Kw)/(K1+F)) The...
  26. G

    Rank acidity of organic compounds

    Homework Statement Rank by acidity Homework Equations Br is lower on the periodic table, hence more acidic. But in the first compound, it is also farthest away from the carboxylic acid, which one gets priority ? The Attempt at a Solution I think The one with the bromo group closest to the...
  27. Y

    Does the reactivity series of metals hold true for organic compounds?

    I've learned that a more active metal displaces a less reactive one. So, according to the reactivity series Ca cannot displace Na but in he reaction given at http://en.wikipedia.org/wiki/Soap_scum Na is displaced by Ca. What is the reason for this exception?
  28. C

    R/S Configuration and Identical Compounds

    Homework Statement Hello, so I think I've been looking at this problem way too long, and I'm going no where with it. It is in my attached picture, because it is easier to draw than write out on here. The key says these two are identical compounds, meaning they should have the same...
  29. Q

    Formation of hydrates from ionic compounds

    Homework Statement Not really much of a problem - just a general question and some speculation on its answer. Why do some ionic compounds such as aluminum fluoride form hydrates while other ionic compounds such as sodium fluoride don't form hydrates upon being dissolved in solution...
  30. M

    IR Absorption of Compounds: Why the 3300 cm-1 Peak?

    When analyzing the absorption pattern for different compounds when radiated by IR radiation, we see the wavelengths of the IR lights that is absorbed. These wavelengths correspond to the frequency at which the bonds in the molecule vibrate. My question is why a compound, for example an alcohol...
  31. S

    Why transition metals can have unpaired electrons in their compounds?

    Why can have transition metals unpaired electrons in their compounds? In correlates to their multiple oxidation states, but I still don't know the explanation of it, that would make me satisfied - I suppose it's mathematical, as molecular orbitals are creating. Or is there any explanation?
  32. H

    MHB Calculation when Mixing Two Compounds....

    Dear Comunity, I am running into a (probably pretty simple) problem here, yet the most simple things are sometimes upon me...:( I have a liquid solution which consists of 70% compound A and 30% compound B. I also have a bottle with 100% compound A. What I would like to do is to achieve a...
  33. M

    Density changes of compounds when put in a mixture

    Hello, I was wondering conceptually, why does the density of the individual components change when they are added into a liquid mixture? So consider adding ethylene glycol and water together, when they are added to a container as a mixture, their densities are no longer their densities...
  34. F

    Atomic scattering factor for compounds

    Hi there, I am trying to calculate diffraction efficiencies of a lattice with the coupled wave theory. As material parameters the programm I got needs the atomic scattering factor f1 and f2. (see http://henke.lbl.gov/optical_constants/asf.html for elements) I understood this seems to...
  35. B

    Isomerism in coordination compounds

    Can someone outline a comprehensive way to figure out and write all the different isomers of square planar and octahedral single-centre coordination compounds, without needing to be able to see them in 3D (and without a computer)? Questions come up all the time on my exams and a proper way of...
  36. J

    Help building a database of organic compounds used in pharmaceuticals

    Hello Guys, So I'm trying to build a database of organic compounds that are of interest to the pharmaceutical industry. Most importantly compounds containing heteroatoms (>= 15% by mass). Where do i start!? any good websites or books, with a useful appendix you can tell me about? I would...
  37. PhizKid

    How to multiply chemical compounds together?

    Homework Statement CuSO_4 \cdot 5H_20 Homework Equations The Attempt at a Solution We never learned this. I don't even know what it means to "multiply" compounds together...doesn't make any sense to me
  38. H

    Covalency and Oxidation Number in Covalent Compounds

    Homework Statement NCl_{3} What is the Co-valency / Oxidation number of Nitrogen in this Covalent compound ? Homework Equations I think the table of electronegativity might be useful The Attempt at a Solution Nitrogen must be "-3" since it is more electronegative than Chlorine. The...
  39. D

    IUPAC Naming of Organic Compounds: Cis and Trans Isomers with Substituent Groups

    Homework Statement Give an acceptable IUPAC name for these compounds. http://i.imgur.com/tHUpwYK.pngThe Attempt at a Solution So the question is really on the 2nd problem in the picture but I need to reference the first one for my question. So my original guess on the 2nd problem was...
  40. S

    Electrostatic charges in ionic compounds

    From this link: http://www.chemguide.co.uk/atoms/structures/ionicstruct.html it explains why NaCl has a 6:6 coordinated structure and not an 8:8 coordinated structure. However, i don't really understand their explanation "Now imagine what would happen if you replaced the caesium ion with the...
  41. N

    What is the work function of AlGaN and how can it be calculated?

    Hello, I would like to find out (or calculate) what the work function of AlGaN is. I do not really understand how to calculate workfunction for compounds. I know that the work function of Al is 4.06-4.26eV and Ga is 4.32eV... I can't find N. Is it possible to do a calculation for a...
  42. H

    What are the chemical names of these two compounds?

    Could someone give the proper chemical names of the attached two compounds. Lots of thanks in advance.
  43. AGNuke

    R/S Configuration of Compounds

    I got this problem today in my International Chemistry Olympiad Paper, quite bugging me this question, so I am better off asking it. My question is, which of the following has R configuration? From what I tried, I got both of them as S, and the remaining two options being confirmed...
  44. A

    Will gaseous ionic compounds be free moving ions?

    I knew while learning about electrolysis that if the ionic compound is molten it becomes free moving ions. If that is the case, what will happen if I continued heating till it reaches the boiling point so that the ionic compound evaporates? Will it still be free moving ions?
  45. C

    Alloy compounds vs alloy solid solutions?

    Hi, What is the difference between alloy compounds and solid solutions I understand so far that solid solutions are homogeneous in composition, which must mean that one, two or more different atoms have same crystal packing structure when combined to form a solid solution.
  46. G

    Properties of polyhalogen compounds in Solution

    I'm having trouble finding information on polyhalogen compounds ie CsICl2 when they are dissolved in solution. I've made dichloroiodide and I'm trying to figure out why/what happened when added to HCl/NaOH/and with KI added to both acidic and basic conditions, but I don't know how to...
  47. Weissritter

    About noble gases compounds and XeO3

    First disclaimer: Xenon trioxide, while not existing naturally, can be created artificially. This question is not like "When did you stop beating your wife?" type. So...I read this compound is explosive. Well, a coke and mentos is also explosive. TNT is too. And then, I wanted to know is...
  48. S

    Chemistry Calulating Atomic Percentages given moles and weights of compounds

    Homework Statement This is the statement out of a paper: Slurry 10 grams of ZnS with 3mL of .2N Cu(CH3COO)2 solution (corresponding to 0.6 atom % Cu) and 1.7 mL of .2N NH4Cl solution (corresponding to 0.34 atom % Cl) So my question is how did they calculate the .6 at. % and .34 at. %...
  49. R

    Preparation and naming of coordination compounds

    Homework Statement Hi. The combination of Fe(II), H2O, Cl- y NH4+ yields 3 coordination compounds, one of which is: [Fe(H2O)6]Cl2 Which are the other ones? Homework Equations The Attempt at a Solution Even though I sort of know how the compounds could be formed I don't why or rather , how...
  50. M

    Organic compounds with a charge

    Why is it that when you have an organic compound with a charge on the C, that charge takes the place of one hydrogen bonded to that C?
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