Thursday
October 23, 2014

Posts by Un


Total # Posts: 26

Geometry
the answer is 18/5=4/T 18T=20 T=10/9
March 31, 2011

chemistry
Rank from decreasing to increasing the effect the functional groups have on the melting point of compound x: -OH or -COOH i think its COOH<OH because OH is easier to hydrogen bond?
December 2, 2008

chem
A solution consisting of isobutyl bromide and isobutyl chloride is found to have a refractive index of 1.3931 at 20oC. The refractive indices at 20oC of isobutyl bromide and isobutyl chloride are 1.4368 and 1.3785, respectively. Determine the molar composition (in percent) of ...
November 11, 2008

chemistry
i inputed: -Log(5.20 x 10-4) ph=3.28 but its incorrect?
July 9, 2008

chemistry
okay, i got 2.8E-4 mols of NaOH and 8e-4 MOLS of acetic acid, so do i just plug in mols of hcl into -log(hcl)?
July 9, 2008

chemistry
What is the pH of the solution created by combining 2.80 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? mL of NaOH pH w/HCl pH w/HC2H3O2 2.80 ? ? okay, so i tried m1v1=m2v2 and when i got m2 i would input it in -log(H+) to...
July 9, 2008

chem
thats not the ansr, need a check
July 7, 2008

chem
i got 1,8,1,1,4,1 but the second coeffient(one) and the last coeffient(one) are incorrect. im not sure what goes for ____Fe(2+) and ___Fe(3+)
July 7, 2008

chem
Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. ___MnO4(–) + __H(+) + ___Fe2 + __Mn(2+) + ___H2O + ____Fe(3+)
July 7, 2008

chem
need the check pls
July 7, 2008

chem
on this one i got:2,16,2,2,8,4 but it say that the second(2)which is the coefficent for C204(2-) and the 4 on the co2 is wrong ? what might be the problem?
July 7, 2008

chem
Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. __MnO4(–) + __H(+) + __C2O4(2–) __Mn(2+) + __H2O + __CO2 i need a check pls
July 7, 2008

Chemistry
i see what my problem is, thanks i got it.
June 28, 2008

Chemistry
iam confused with the ice table could you show me because my answer .0002 is incorrect thanks.
June 28, 2008

Chemistry
The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.510. If a trial's absorbance is measured to be 0.250 and its initial concentration of SCN– was 0.00050 M, the equilibrium ...
June 28, 2008

Chemistry
A standard solution of FeSCN2+ is prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN. The equilibrium concentration of FeSCN2+ ([FeSCN2+]std) for this standard solution is assumed to be__?__M
June 28, 2008

Chemistry
thanks but i figured how to do this
June 28, 2008

Chemistry
The concentration and volume of reagents combined in each trial are listed in the table below: Trial 00020 M 00020 M H2O(mL) Fe(NO3)3mL) KSCN (mL) 1 5 2 3 2 5 3 2 3 5 4 1 4 5 5 0 Initially (right after combining and before any reaction occurs) the concentration of SCN– in...
June 28, 2008

chemistry
____?____g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m(molality).
June 26, 2008

Chemistry
A solution is made by mixing 35.0 mL of toluene C6H5CH3 d=0867gmL with 125.0 mL of benzene C6H6 D=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are? Find M and m
June 26, 2008

chem
thanks i got
April 20, 2008

chem
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
April 20, 2008

chem
An aspirin tablet weighing 0.650 g has been analyzed and contains 68.2 % ASA (180.16 g/mol) by mass. A student dissolved the tablet in hot NaOH and the cooled solution was diluted with DI water to the mark in a 250 mL volumetric flask. Exactly 3.00 mL of the solution was ...
April 18, 2008

chemistry
Determine the ionization energy of a hydrogen atom (in kJ/mol) if the electron is in its ground state. (Hints: Use the Rydberg equation, remember E=hc for a single H atom, and R=109678x10–2nm )
April 10, 2008

chemistry
You transfer a 2M stock solution of Y into a container using a slightly wet pipet containing water drops. The concentration of the transferred solution Y has a ? (lower, higher, or same) concentration than(as) 2M.
April 3, 2008

chemistry
o prepare a 200 mL of aqueous stock solution X, you transferred 50 mL of a known concentration solution into a 200 mL volumetric flask. If you realize that the volumetric flask was contaminated with water droplets after you cleanly transferred the known concentration solution...
April 3, 2008

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