Chemistry

I need to make a solution of Glycerol (per liter) 150 g (1.26 g/ml), final conc 15 % w/v. And here comes the clue, the only thing we have is glycerin (and that's the same, I know that) but that's is liquid! I have found that i should go this way: Glycerol/glycerin has a density of 1.25 gm/mL. 15 % (w/v) is equal to 150 gm/Liter = 12% (v/v). (150 gm/L)/(1.25 gm/mL) = 120 mL of glycerol/L. My question: Is gm the same as g? How do you get 15 % (w/v) Glycerol= 12% (v/v)glycerin ? Hope for inputs. Thank you.

hey is a diatomic molecule a molecule containg 2 atoms of the same type or just a molcule which contains 2 atoms that can be of any type (same type or not the same type) ? Cheers sarah

hi, 1. i was wondering if anyone has any ideas about what kinds of graphs i could do with these experiments. It is in relation to corrosion and shipwrecks and salvage. the experiment is certain metals and there relation to substances. metals are: Cu Al Zn Fe Pb Mg the substances are: NaOH (of unknown concentration) HCl H2SO4 distilled water NH4 (if anyone else can think of any other substances that would be good, please go ahead and tell me) The metals are put in tests tubes with each individual substance the results are tabled. What kind of things could graphs be used for? 2.Does anyone here know how to write the perfect aim? 3. what varia…

I'm going to attend university of florida this fall. I have taken AP chemistry and i was wondering how fast the class moves and how different it is from what you cover in AP chem. I guess im just worried that i might take the class for an easy class and end up being overwhelm by the unanticipated course. Same questions with the labs with the course.

ok so i found a web site selling an ebook that supposedly gives you extremely specific instructions on how to convert your average car to run on water. http://www.h2oconversion.com now i know the theory behind it quite well. however i do not know all the problems that keep this technology back. i've been told hydrogen burns way too hot. a car could not handle it. and there is the conspiracy that it is just the oil companies keeping it back. so what is your opinion. is this technology capable of exsisting and do you think this site could have it?

hey i was wondering if anyone knew the calculations to work out the approximate pH of: NaHCO3 1 M HCl 10 M HCl 0.001 M HCl and also how to write the equations to determine to pH of NaHCO3 and NaCH3C00? Thankyou

I was given the task to write the balanced reaction of scandium fluoride reacting with calcium, but in ionic equation. However, I dont know what is it, even when I looked up the answer. it looks like 3Ca+ + Sc3+ ----> 3Ca2+ + Sc what is it all about?? I mean, on LHS, why is Ca +?? isn't it 2+?? Albert

Is a heated container along with hot electrodes and water common in electrolysis? Should the water get really hot (boiling). If so, why does this happen?

I did use the Search function for freezing water but i couldent find anything that actully froze water So I ask the question again how do you Freez water using chemicals ? Thanks for you help.

I tried to do it, but please check if it's right or not, The equilibrium expression is: 2ICl -> I2 + Cl2 Kc is 4.8x10-6 Find out the equilibrium concentration of Cl2, if the initial concentration of ICl is 1.33 mol/L. There is no I2 or C2 initially present. so... Kc = [iCl] / ([i2] [Cl2]) Substituting gives: 4.8x10-6 = 1.33 - x / (x times x) Next we arrive at this quadratic equation in standard form: 4.8x10-6x2 + x - 1.33 = 0 Using the quadratic formula, which is x = (- b ± square root[b2 - 4ac]) / 2a, we obtain: x = (- 1 + square root[(1)2 - (4) (4.8x10-6) (-1.33)]) / 9.6x10-6 After suitable calculations, i got x = 1.33 strange…

hey i can't figure this question out... "What is the pH of the 1.0x10^-8 M HCL?" could i please have some help? Smile Thanks Sarah

hey another questions guys.... isnt there one too many Hydrogens on the left most carbon atom (to the right of the arrow)??

i don't agree with any of these answers: (but i am sure that i am wrong of course ).... so little help please if anyone has time

i can't see how these two molcules are the same....??

Ok I got some car battery sulfuric a while ago and today I needed some hydrogen so I dumped a nail it 25ml. Well after I got the Hydrogen I needed I decided to leave the nail in there to see how much it would disolve. Here I am about 6 hours later and the nail is still moderately reacting. How concentrated do you think this acid is? The nail was not galvanised and it has been sitting at room temperture all day. I did some very rough calculations when I first got it and worked it to be about .4mol/L althought this calc was done rushidly and poorly. I can't be arsed titrating it so can anyone give me an idea on how conentrated you think it will be? ~Scott

would any chemistry wizz's be able to help me out with this problem...? i just don't see why the formal charge on the sulphur atom is zero, i thought i would be +3. Thanks Sarah

How do we work out the valencies of such radicals as [math]SO_4[/math]? Do most compounds have valencies or just radicals? I always thought that for something to have a valency it would have a desire to gain or lose electrons, I cant see how a compound would do that... it just doesnt seem to make sence, once it is a compound it should be satisfied. Hope somebody can help me clear this up.

Some of you are aware of the fact I have already prepared two chemical calculators (see signature). I am planning to extend the line of programs and I have several ideas about what could the next calculator do. However, before starting work I decided to do a quick poll: What type of calculations would you like to have automated? Which calculations are the most tedious? Which calculations are eating most of your time, regardless of the fact that you know how to do them? Best, Borek -- Chemical calculators at www.chembuddy.com pH calculation concentration calculator

Hi, my mum has told her students (ages: 9/10/11) that she will do one science experiment per week. What would you suggest to be some interesting experiments for her to do? I suggested she get some batteries and graphite electrodes to break water into its constituents and make a bang but she doesnt want her kids going home and hurting themselves. Any ideas? I ask this in the chemistry section but it is not restricted to this field of science.

this morning i was looking through an organic book i am borrowing. reading about bond angles, i came across the fact that not all SP^3 bond angles are 109.5 degrees. i knew this before, but i didn't know the way to calculate the angles. this book discusses the fact that Cl-C-H bonds in CH3Cl are 108 degrees and calls the C-Cl bond an SP^3.1 and H-C-H bonds are 110 degrees with a C-H bond of SP^2.9 character, but still, it doesn't explain how one can come to these conclusions. does anyone know a way to calculate the bond angles made by a central atom that is not bonded symmetrically? conceivably, one could calculate this using the average positions of bonded ele…

hey im new here and i was just thinking of this question and it puzzles me. Why does thet solubility of most solids increase when the temp. increases but the solubility of gases increases at a lower temp?

Hello all, I'm trying to locate some information on how the temperature of steam would vary in a 1.8m column. I know the average temperature, but a rough idea of the variation / profile would be very helpful. Either an equation or two, or actual data. Thanks very much, Chris

Hi everyone, just a query about my ol' 1940s gold Ebel wristwatch.... not, I know they used radium salts for the luminous hands,but I am surprised to see it measures at 15 microSv/hr..... I presume that's normal, Just wanted to see what you all thought!

Ive never really thought about it, but I was just wondering, how does a simple battery where zinc and copper are inserted into an electolyte work?

Can someone define entropy and enthalypy in terms easy to understand?