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Chemistry: Post your doubts here!
Not really, remember that organic molecules also have a hydrophobic segment. Recall why alcohols become less soluble as the chain increases. H bonding needs to be significant enough to allow a molecule to dissolve in water, it doesn't mean that a substance will definitely dissolve just because... -
Chemistry: Post your doubts here!
Yes , the carbon in methane is oxidised, -4 to -3 -
Chemistry: Post your doubts here!
Oh, Cl2 is reduced to HCl. Oxidation state of Cl from 0 to -1 -
Chemistry: Post your doubts here!
Oh, Cl2 is reduced to HCl. Oxidation state of Cl from 0 to -1 -
Chemistry: Post your doubts here!
Hmm, I'm suprised. Do you have the year of the paper? -
Chemistry: Post your doubts here!
Don't forget that the complete definition also includes a portion where the partially positive H atom is attracted to a lone pair of a neighboring molecule. The CO2 is responsible for the yellow portion. http://www.answers.com/Q/Does_carbon_dioxide_form_hydrogen_bonds_with_water -
Chemistry: Post your doubts here!
limiting the discussion to molecules, it would usually require the molecule to be capable of forming hydrogen bonds with water. E.g small chain alcohol, esters, ketones, aldehydes, carboxyllic acids Even CO2, which is a non polar molecule, can dissolve relatively well in water compared to... -
Chemistry: Post your doubts here!
I'll help with Q8 and Q25 as the other questions are already explained. -
Chemistry: Post your doubts here!
The stronger the forces of attraction among the ions, the higher the melting points. The force is directly proportional to the charges and indirectly proportional to the distance between the ions. In this case, since the compounds are all +2 and -2 charges, the factor that makes a difference... -
Chemistry: Post your doubts here!
CaMg(CO3)2 + 4HCl --> CaCl2 + MgCl2 + 2H2O + 2CO2 moles of CO2 = 0.45/44 = 0.01022 mol moles of CaMg(CO3)2 = 0.01022/2 mass of CaMg(CO3)2 = (0.01022/2) x Mr % purity of CaMg(CO3)2 = (mass of CaMg(CO3)2 /mass of sample) x 100% -
Chemistry: Post your doubts here!
The paragraph is trying to bring across two points 1) it is possible for a molecule to be overall non-polar and yet have positive and negative charge regions. 2) there is attraction between the positive region of one molecule and the negative region of another molecule (however, I think... -
Chemistry: Post your doubts here!
True, and then the HCl reacts with MnO2 to form Cl2. https://in.answers.yahoo.com/question/index?qid=20070210102229AATL2fC -
Chemistry: Post your doubts here!
Statement 2 is incorrect if we can find any group that has a decrease of melting point going down the group, one simple example is Group I. -
Chemistry: Post your doubts here!
The part on the cis-trans is incorrect. We are talking of cycloalkenes, for ring structures less than 8 carbons, we will not expect to see the trans isomer due to the strain on the bonds. -
Chemistry: Post your doubts here!
VSEPR in simple terms states hat LP-LP repulsion> BP-LP repulsion > BP-BP repulsion. And such repulsion will to an extent, determine molecular shapes. All you have to do is follow the usual method of figuring out the number of lone pairs and bond pairs in a molecule to determine the shape. 1... -
Chemistry: Post your doubts here!
You have misread the question, it should be ethyl propanoate. Products are thus CH3CH2OH and CH3CH2COONa. Using their Mr, % by mass of CH3CH2OH = 46/(46+96) =32.4% -
Chemistry: Post your doubts here!
In this case , they are numerically same because the concentrations of both solutions are 1 mol/dm3. I will include extra steps (in green) to the original solution, since its not clear. Let volume of CH3COOH be x dm3 volume of CH3COONa = (0.1 - x) dm3 moles of CH3COOH = vol * concentration =... -
Chemistry: Post your doubts here!
Let volume of CH3COOH be x dm3 volume of CH3COONa = (0.1 - x) dm3 moles of CH3COOH = x mol moles of CH3COONa = (0.1 - x) mol [CH3COONa]/[CH3COOH] = x/(0.1 -x) pH = pKa + lg ([conjugate base]/[acid]) 5.5 = - lg (0.0000179) + lg [x/(0.1 -x)] 5.5 = 4.747 + lg [x/(0.1 -x)] 0.75285 = lg [x/(0.1... -
Chemistry: Post your doubts here!
The 17 cm3 of NaOH used, is that a figure obtained by actually carrying out the experiment or just a number randomly chosen? If randomly chosen, it might mean that the final answer of the formula of RCO2H would not make sense. -
CHEMISTRY URGENT HELP!
It is a good source of demanding questions. If you have already finished questions from 9701 and would like to practice further, then theres no harm in trying out the H1/H2 from Singapore.