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chemistry

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  • rate of reaction

    How do i find the rate of reaction, can you step by step to the solution, pleaseThe reaction A + B → C + D is second order in A and zero order in B. The value of k is 0.0103 M-1min-1. What is the rate of this reaction when [A] = 0.116 M and[B] = 3.83 M?

  • Lewis structure

    Draw the Lewis structure of Br2Ch2Is it Poplar, nonpolar, or it cant be determined?

  • Bromocyclohexane

    a. Draw the alternative chair conformation of bromocyclohexane (after the ring-flip) in the template above.b. Label Br as axial (a) or equatorial (e) in structures A and B.c. Which chair conformation is more stable, A or B? Why?

  • polypeptide bonds and secondary structure

    Explain why rotation about N-Ca and Ca-C bonds is solely responsible for the secondary structure of a polypeptide.

  • ENTROPY FREE ENERGY AND EQUILIBRIUM

    The following reaction occurs at 25°C.H2O(l) H+(aq)+ OH ‾(aq)Calculate ΔG for the reaction for thefollowing conditions.(a)[H+ ] = 1.0 10-7 M, [OH ‾]= 1.0 10-7 M(b)[H+ ] = 3.4 10-4 M,[OH‾ ] = 2.1 10-5 M(c)[H+ ] = 1.6 10-13 M, [OH‾ ] = 5.2 10-9 M(d)[H+ ] = 3.3 M, [OH ‾ ]= 3.6 10-5 M

  • Need Some Serious HELP PLEASE!!!!

    Given that Lead(ll) Hydroxide is dissolved in water: Ksp= 2.3* 10^-14-whats the equation showing the dissolving of lead(ll)hydroxide in water- whats the equilibrium expression- and the molar solubility of lead(ll) hydroxide inwater??I have no idea where to start with these things...thank you very much for your help! =]

  • names and formulas

    name following formulasAgNO3.5H2OCe(IO3)3.2H2OCa(OH)2.4H2OS2CL2BrCL3BCL3SF6HFHNO3HBrOH2Sformula for followingchloric aciddinitrogen monoxideselenium hexafluoridecarbon tetrachloridecan anyone please help with these? thankyou.

  • Ka for a weak acid

    The pH of a .500 M solution of an aqueous weak acid (HA) is 2.30. Calculate the Ka for the weak acid.

  • Finding the vapor pressure of a solution.

    A student dissolves 20.0 g of glucose, C6H12O6, into 511 mL of water at 25 degrees C. The vapor pressure of pure water at 25 degrees C is 3.13 x 10^-2 atm. Find thevapor pressure of the solution.

  • Moles acetate in sodium acetate.

    Using the formula weight ofNaC2H3O23H20, calculate the numberofmoles of acetate ion,C2H3O2- in 3.47 g ofNaC2H3O23H2O.

  • Thermodynamics Phase Changes

    Heat is added at constant pressure to exactly 2.000 moles of Methanol, CH4O, initially solid at the “normal” melting point, until it is transformed to vapor at 200.0C. The overall process involves 5 steps: [1] melt the solid at constant temperature; [2] heat liquid at constant pressure to the “normal” boiling point; [3] vaporizeliquid at constant pressure; finally [4] heat vapor to final temperature. 1. Calculate ?H for step#1. 2. Calculate q for step#2. 3. Calculate ?U for step#3. 4.Calculate ?U for step#4. 5. Calculate ?U for the overall process. 6. What percent of the total internal energy change is due to the two phase changes?

  • Solubility rules

    Whichof the following hydroxides is predicted to be the least soluble inwater?TlOHFe(OH)2KOHAl(OH)3Ca(OH)2

  • Please Help, Its EASY but I dont get it, Will give lifesaver!

    Calculate the molar solubility of Ag2SO4 inthe following solutions. (See Appendix C.)(a) 0.27M AgNO31 M(b) 0.27 MNa2SO42 M

  • Enthalpy of a reaction from average bond enthalpies

    Predict the average enthalpy for the reaction from averagebond enthalpies from the following reaction.2C2H6+7O2→4CO2+6H2OThese values are in kJ/molH-H436.4H-O460C-H414C-C347C=C620C-O351O-O 142O=O498.7C=O745C=O Carbon Dioxide799Thanks for your help

  • General Chemistry

    N/A

  • General Chemistry

    A 6.54-gram sample of a compound is dissolved in 250. grams of benzene. The freezing point of this solution is 1.02°C below that of pure benzene. What is the molarmass of this compound? (Note: Kf for benzene = 5.12°C/m.).

  • reaction rate

    What is the denfintion of reaction rate?

  • Identifying compound from NMR and IR... Help!

    Please help me figure out what compound this is based on the IR and NMR data given. I have no idea where to even start!

  • Amines Question. Will Rate High

    Amine preparation strategies.(a) There are several synthetic schemes that can beused to synthesize the amine below. Use the information given todetermine the reactants used.The solution is slightly acidic.organic reactant A has the following spectral data:IR peaks: sharp 1730 cm-1, weak 2720 cm-1, weak 2820 cm-11H NMR: 9.0 ppm (1 proton,splitting not resolved), 2.2 ppm (3 protons, splitting notresolved)Draw its skeletal structure Draw the organic reactant B which you should be able to deduceknowing what the other organic reactant is. (b) This same amine can be synthesized from a single molecule byreduction with LAH. Use the spectral information below to determinethe starting material and thendraw its skeletal structure.1H NMR: 1.2 ppm (4protons, triplet of triplets), 1.23 ppm (2 protons, quintet), 2.02ppm (3 protons, singlet), 2.4 ppm (3 protons, singlet), 2.99 ppm(4protons, doublet of triplets), 3.73 ppm (1 proton, quintet), 4.2 (2protons, singlet), 7.0 ppm(2 protons, doublet), 7.14 ppm (2protons, doublet) please explain.

  • Please Help! Urgent conversion

    From the M1V1 =M2V2 problem such as 0.05 M HNO3in 50ml from a 15.9 M of HNO3 in which the answeris V1= (0.05M)(50ml) / 15.9M = 0.157mlTo that solution how would I add sufficient[Co(NH3)5Cl]Cl2 to give a 1.2 x10-2 M complex concentration?Thank-you for reading and helpingg