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. K

    Organic Compounds Structural Formula

    when drawing the structural formula for 2-methylbutane or 2,3-dichloro-2-methylbutane,does it matter which end of the chain i begin counting from?
  2. L

    Some quick and simple help please - Tetrahedral Compounds

    Homework Statement Could you please describe to me in simple terms how carbon forms tetrahedral compounds as I will need to do some work on it. Thanks. Please make it only a line or 2 (summarize) Thanks. Homework Equations N/A The Attempt at a Solution N/A
  3. G

    Redox Reactions: Ionic vs Covalent Compounds

    Hi, I just learned about oxidation and reduction reactions and I have some questions. Are all ionic reactions redox reactions? Do elements that make up covalent compounds always have an oxidation number of zero because they only share electrons, not give or take? That is what I was thinking...
  4. E

    How to identify unknown compounds

    Our chem project is to identify 5 unknown compounds, just wondering if anyone here had any good ways to go about doing this besides the usual melting / boiling / ph tests etc.
  5. Char. Limit

    Silver Compounds: Why AgCl is So Insoluble

    Why are compounds of silver (AgCl, for example) so insoluble?
  6. P

    How do electrons in glow in the dark compounds gain and release energy?

    I have a basic understanding of how the "glow in the dark" idea works. From what I can tell, electrons gain energy from light, "charge" up and move to a higher energy level, and when they no longer receive energy from the light (are in the dark), the electrons fall back toward a lower level and...
  7. C

    Definition of Aromatic Compounds

    Hi guys, i am wondering what defines an aromatic compound? From what i know, benzene is an aromatic compound, but why is it called an aromatic compound? Is it because it has alternating Double and Single Bonds? If so can i say Cyclohexanone is also an aromatic compound? thanks.
  8. C

    Chemistry Chemistry - Trying to name aromatic compounds and organic chemistry molecules

    Im trying to name the following molecules 1- CH3-CH2-CH-CH2-CH-CH2-CH2-CH3 l l CH3 CH2 l CH3 2- CH3-CH2-CH-CH2-CH-CH3 l l CH2 CH2...
  9. M

    (CHEM) Which of the following compounds can exist as cis and trans isomers ?

    Using average bond enthalpy values estimate ΔH (kJ/mol) for the following gas phase r Using average bond enthalpy values estimate ΔH (kJ/mol) for the following gas phase reaction. CH2=CH2 + Br2 --> CH2BrCH2Br I followed this topic...
  10. G

    Differentiate an ionic from a covalent compounds

    I have come to a situation that I can hardly differentiate an ionic from a covalent compounds! Before this confusion I had firstly known that whenever I find a compound with constituents of atoms with a very large difference in electronegativity, then i just conclude that its ionic, or when I...
  11. S

    Identifying unknown organic compounds

    Homework Statement A chemist has three liquids (Ethanol, butanoic acid and 3-heptyne) labelled P,Q,R (in no specific order). When drops of bromine solution were added to samples of each liquid, P and Q decolorised the bromine, but R did not. When drops of sodium carbonate solution were added...
  12. K

    Determining how compounds react

    Is there any way to predict how two chemicals will react or is it up to experimentation to discover that? Take salt + water for example: NaCl + H2O -> HCl + NaOH The equation is balanced, but obviously when mixing salt and water you don't get hydrochloric acid...you get salt water... So...
  13. B

    What is the Difference Between Biotic and Abiotic Compounds in Soil Samples?

    I’m working with some samples in a soil lab and have been asked to propose a hypothesis about the difference between a sample with life in it and a sample with no life in it. I have searched the literature but there is no straight-forward answer to this that I have seen. I think there are...
  14. J

    What distinguishes polar and nonpolar compounds?

    what is the difference between polar and non polar compounds
  15. L

    Aqueous and gaseous elements and compounds?

    Homework Statement Predict the sign of ΔS(sys) for each of the following processes: a) Zn(s)+2HCl(aq)-->H2(g)+ZnCl2(aq) b) CH3CH2CH3(g)+5O2(g)-->3CO2(g)+4H2O(l) Also, I'm not sure but when we're evaluating questions like these, do we count the number of moles only of solids, aqueous and...
  16. T

    Endothermically dissociating compounds ?

    name a few compounds that dissociate endothermically ...also please let me know about their end products...
  17. Q

    Best way to ionize compounds and/or elements?

    Whats the best method for this? Just removing electrons, how long will the ionized state last, and can I do it in a makeshift kind of way with household/cheap parts?
  18. M

    Nucleophiles and carbonyl compounds .

    Homework Statement Why do bases like OH- etc. remove \alpha-H from carbonyl compounds like ketones and aldehydes (aldol condensation) whereas amines and derivatives like NH_{3}attack the carbon centre of carbonyl groups ? Homework Equations none. The Attempt at a Solution Thought...
  19. S

    What are the criteria for classifying compounds as ionic?

    Homework Statement Which of the following compounds are properly classified as ionic? (select all that apply) HOCN SF4 NH4NO3 MgCl2 K2O Li2 NF3 Homework Equations n/a The Attempt at a Solution My initial choices were MgCl2 & K2O ... however, since this was incorrect (it...
  20. D

    Writing formulas for compounds.

    I'm a student that isn't quite understanding how to write formulas for compounds. any help would be appreciated. thanks.
  21. U

    Organic Chemistry: Aromatic Compounds

    Hello, Is there any mistake ? http://img216.imageshack.us/img216/7462/90558873jn1.png
  22. P

    Comparing acidity among 3 compounds - pic included

    Homework Statement http://img114.imageshack.us/img114/3643/acidspicem4.th.jpg http://g.imageshack.us/thpix.php My book says that if I attach an electron-donating group to an acid, it would decrease the acidity of that acid because the electrons would cause the already negative ion to...
  23. F

    Does Anybody Know How to Name the IUPAC of these Compounds

    Homework Statement Does anyone know how to name these? I know how to name ethers when there is only one but these are just insane. IUPAC of course.Homework Equations 1. O ||...
  24. S

    Questions about polyatomic ion compounds

    I'm extremely confused in regards to many aspects concerning polyatomic ions. For one, am I correct in thinking that covalent polyatomic ions gain charges by having components dissociated? Ex. A and B are sharing an electron, A has a significantly greater hold, B is dissociated by something...
  25. K

    Type of Reaction for Organic, Nitrogen Compounds in Homework Question?

    Homework Statement Part of a long question: suggest the type of reaction occurring: (C6H5)3C-NH-CH(CH3)-CO-NHCH2COOH -----> (C6H5)3C-H + NH2-CH(CH3)-CO-NHCH2COOH The Attempt at a Solution what i got in mind is that it could a free radical substitution reaction?! using H2...
  26. M

    Aromatic Compounds: Definition and Examples

    At first I read that an aromatic compound is a compound that contains a ring with alternating double bonds in which the electrons are delocalized and the ring exhibits a greater stability than regular conjugated systems. That makes sense to me. In Organic Chemistry by Clayden I read something...
  27. M

    Do all salts have an ionic bond, regardless of their constituents' bonding?

    Does a salt always have an ionic bond in it regardless of whether it's constituents are covalently bonded or not? When an acid reacts with a base does it always create a salt by means of ionic bonding? I hear all salts are soluble in water but bases are not. What about acids. Are acids soluble...
  28. T

    Solubility of compounds in water

    Hi I'm not too familiar with why certain compounds tend to disassociate completely/partially in the water solvent. In one experiment from lab I remembered that HCL dissolved completely whereas CH3COOH (acetic acid) only partially dissolved. Weak acids generally don't hydrolyze completely...
  29. Loren Booda

    Exploring Diamond Compounds: Carbon's Role in Chemical Structures

    Are there any chemical compounds that include carbon as diamond?
  30. A

    Compounds and mixtures - similarities and differences

    [b]1. I have a science test do tommor! I was sick the two last day, so i looked and couldn't find the simmilarties between mixtures and compounds. Homework Equations The Attempt at a Solution
  31. P

    Arranging Compounds by Increasing Lattice Energy

    Homework Statement Order the following compounds in order of increasing lattice energy: AlN, BaTe, KCl, Rb2Se Homework Equations The Attempt at a Solution Ok I know that as the distance between the two nuclei decreases and as the charge of the cation and anion increase the lattice energy...
  32. T

    Standard Heat of Formation of Uranium Compounds

    There is a bit of data and literature that shows the standard heats of formation for various uranium compounds including UO3, U3O8 UF6 etc. However there appears to be nothing on ammonium diuranate which is one of the most common intermediate forms produced by precipitation. The ADU as it is...
  33. I

    Exploring Metal Compounds and Their Colors

    Are there any green, blue, or purple metal compounds (non-alloys)? Also, is there any list of all known stable metal compounds and their colors?
  34. N

    Naming Benzene Compounds: OH and H Attached to Same Carbon Atom

    Homework Statement There's a benzene ring with both OH and H attatched to the same carbon atom on the benzene ring and I was wondering what this molecule would be called. The Attempt at a Solution I thought it might be an acid group attached to the benzene ring but wouldn't there...
  35. J

    Combining ions to make ionic compounds

    Homework Statement How do i combine 2 different ions to make an ionic compound Homework Equations Na+¹ + O-² ---> The Attempt at a Solution I have no idea what to do plus I am new to this forum. Please try to help me in the simplest way possible because my teacher has failed...
  36. D

    Solving Problems Involving Ternary Compounds and Elements

    Problem 1: The class of ternary compounds called carboranes (containing the elements carbon, boron and hydrogen) have played a prominent role in many areas of fundamental chemical research. In particular, they have provided many interesting examples for testing theories on chemical bonding...
  37. L

    What is the significance of a 1:1 ratio in forming compounds?

    What does it mean when a question asks to form a compound with a 1:1 ratio?
  38. C

    Naming and writing formulas of compounds

    Name the following :ZnI2, BrF, FeSO3, CaH2, BaHPO3,CuNO3, AgIO, SO2 write the correct formula of these: zinc sulphate, barium nitrate, gold(III)nitrate, barium chloride, mercurous nitrate, antimony(V)cloride, ferrous bromide, calcium carbonate and hydrobromic acid. i have attempted them...
  39. C

    Naming Compounds: ZnI2, BrF, FeSO3, CaH2, BaHPO3, CuNO3, AgIO, SO2

    Name the following :ZnI2, BrF, FeSO3, CaH2, BaHPO3,CuNO3, AgIO, SO2 write the correct formula of these: zinc sulphate, barium nitrate, gold(III)nitrate, barium chloride, mercurous nitrate, antimony(V)cloride, ferrous bromide, calcium carbonate and hydrobromic acid. i have attempted them...
  40. S

    Polarity of Aromatic Compounds

    Homework Statement I just wanted to check which is more polar: methyl benzoate or methyl m-nitrobenzoate. Homework Equations See below. The Attempt at a Solution The nitrobenzoate is more polar because it has more electronegative atoms bonded to a carbon, so there is a greater...
  41. S

    Aromatic Compounds and Acidity

    In the oxidation of the side chain in toluene with potassium permanganate and water as the reagents, does the acidity increase as the redox reaction is carried out? Thank you.
  42. G

    Monochloride compounds of the halogens

    These questions keep getting better and better :rolleyes: So, for the monochloride compounds of the group 7 member i have to state and explain the trend in their reaction with water. Iv searched the depths of the internet and haven't found much. The only info i got was on iodine...
  43. J

    When you burn an acetate what compounds are formed?

    When you burn an acetate what compounds are formed? Like if you burn copper(II) acteate(CuC4H6O4), because I was making copper acetate and when i was drying it i left it too long and it burned and i redissolved it in water and it was a dark green solution with a reddish orange precipitate in the...
  44. N

    Hydrogen compounds and states of matter

    Chemical properties of hydrogen compounds can have vast differences depending on the state of matter that the substance is in - solid, liquid or gas. The difference in chemical properties is related to the dissociation of H+ from the hydrogen compound into solution. the dissociation of OH-...
  45. M

    Chemical Compounds = Ionic Bonds?

    From what I gather both ionic and covalent bonds transform all the elements involved into ions. Does that mean every chemical compound that exists consists of ions and not atoms or are there chemical compounds that are made of pure unionized atoms? Also when they speak of ionized water what...
  46. G

    Why does fluorine make compounds volatile?

    In medicinal chemistry fluorine atoms are often used on scaffolds in order to increase metabolic stability of a particular compound. The problem with working with reactants that contain fluorine is that they are a lot of times very volatile. For example, I am thinking along the lines of...
  47. S

    Identifying Preferred Reactivity in Organic Compounds

    In organic if you have more than one functional group.. how do you know which will react in preference? In the attachment I've got an organic compound which has an ether and alcohol. In terms of naming the alcohol gets preference. It reacts with excess HI and the alcohol apparently...
  48. D

    How Do I Correctly Name Organic Compounds and Handle Isomers?

    Hey. I've just started organic chemistry in class, and I am currently up to naming compounds, and isomerism. Ive been going through some excersizes, and came across a few questions I am having trouble with. The first one: http://img136.imageshack.us/img136/870/3methylpentanech5.gif...
  49. A

    Naming organic compounds help

    naming organic compounds help pleasezz I need some help naming the compound below CH3-CH-CH3 | CH3CCH=CH2 | CH3-CHCH2CH3 The vertical line should be from the second Carbons not the first. I can't move the line to the middle SORRY! The name I have is 3,4-dimethyl-3-propylhexene
  50. D

    Is There a Universal Model for Predicting All Molecular Geometries?

    I read somewhere on net that hybridization, which is a good model for most of the compounds, is not entirely correct i.e. some molecules show considerable deviation in there molecular geometry from the predictions of the hybrid model and we only use it because it is easier way to understand the...
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