Compounds Definition and 236 Threads

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?

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

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...

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.

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

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...

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.

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...

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...

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...

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...

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...

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...

what is the difference between polar and non polar 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...

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

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?

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...

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...

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

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

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...

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 ||...

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...

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...

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...

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...

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...

Are there any chemical compounds that include carbon as diamond?

[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

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...

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...

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?

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...

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...

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...

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

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...

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...

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...

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.

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...

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...

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-...

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...

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...

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...

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...

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

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...