chemistry! URGENT

61,552 results, page 59

  1. chemistry

    these is 0.1M HCl of 100ml of that solution in a beaker,calculate pH?
  2. chemistry

    How many moles of KBr are there in 35.8ml of a 0.172M solution?
  3. chemistry

    A metal whose threshold frequency is 9.02×1014
  4. Chemistry

    What is the surface tension of water at 23 degrees Celsius?
  5. Science/chemistry

    What does a positive test for an ion mean?
  6. Chemistry

    Calculate the concentration of OH¯ ions in a 1.4*10^-3 M HCl solution
  7. chemistry

    How many moles of Kbr are there in 35.8ml of a 0.172M solution?
  8. chemistry

    what is 2.5% vapor expressed in parts per million?
  9. Chemistry 11

    Calculate the number of moles of Carbon in 27.6g C4H9OH.
  10. chemistry 11

    Calculate # of oxygen atoms in 3.15 moles of MgSO4
  11. Chemistry

    What is the pH of a solution that is 0.10 M CH3NH2 (methylamine) and 0.15 M methylammonium chloride?
  12. chemistry

    Calculate the H3O^+ and OH^- ion concentrations in a solution that has a pH of 3.72.
  13. chemistry

    The pH of a 0.10 M solution of ammonia is 11.1. Find the hydroxide concentration.
  14. Chemistry

    Calculate the molarity of 15.4 g of ethanol (C12H22O11) in 71.0 mL of solution
  15. Chemistry

    Calculate the concentration of all species in a 0.15 M KF solution. Ka = 6.4 x 10-4 for HF.
  16. chemistry

    if 19.0g NaI react, how many grams of NaNo3 are made?
  17. Chemistry

    a. what is the pKb of NO2- b. what is the pKa of the hydrazinium ion?
  18. chemistry

    What is hybridization and what are the different hybridizations for each molecular geometry?
  19. chemistry

    459 torr is how much in atm, pascals, and mm Hg?
  20. Chemistry

    What is the molar mass of 4.56grams of Benzoic Acid?
  21. Chemistry

    how do you know which names end in ide, ite, and ate?
  22. chemistry

    What is the pH of a 2.23 M HCHO2, formic acid, aqueous solution at 25 °C? ( Ka = 1.8E-4 )
  23. chemistry

    what is a standard solution? and what is a function of an indicator in a titration?
  24. Chemistry

    What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.75? The Ksp of Fe(OH)3 is 6.3 × 10-38.
  25. Chemistry

    What is the molar solubility of Fe(OH)3(s) in a solution that is buffered at pH 2.75? The Ksp of Fe(OH)3 is 6.3 × 10-38.
  26. chemistry

    What reaction would you get if you added sodium to water ?
  27. chemistry

    if i want to change the pH of any solution from 5 to 8 what the volume of NaOH 0.1 N needed
  28. Chemistry

    How do you know when to use a coordinate bond with molecular compounds?
  29. chemistry

    What is the principle source of Caffeine? I cannot find it at all!!
  30. chemistry

    How many moles of KBr are there in 35.8ml of a 0.172M solution?
  31. Chemistry

    How many moles of nitrogen are in 5.0×10−2 mole of quinine?
  32. CHEMISTRY

    what happens when h3po4 is heated with zinc and hcl?
  33. chemistry

    briefly describe the process of volumetric analysis
  34. chemistry

    A 10.00g sample of a mixture of CH4 and C2H4react with O2
  35. chemistry

    What is the ionization constant of a weak acid with pKa = 8.0?
  36. chemistry

    could someone explain the fundamentals of titration please
  37. Chemistry

    How many grams of SO2 can be produced from 100g of S and excess O2
  38. Chemistry

    Calculate the % by mass of sulphur in (NH4)2 SO4
  39. Chemistry

    Why are some substances not able to dissolve in water?
  40. chemistry

    100ml of 0.05M of NaOH is added to 0.5g of Ca(OH)2. find the [OH] (from Ca(OH)2)
  41. Chemistry

    At what tempature will a 3.0 m solution of sodium fluride freeze?
  42. bio chemistry

    prepare 1M 100 ml H2SO4, density 1.84
  43. chemistry

    Calculate the [H3O + ] for 0.42 M HCl. Answer in units of M.
  44. Chemistry

    What is the energy of a 425 nm photon? a) 2.82 x 10^-40 J b) 1.6 x 10^-27 J c) 4.67 x 10^-19 J d) 4.67 x 10^-28 J I don't get any of these answers. =S Please help...
  45. Chemistry

    What is the energy of a 425 nm photon? a) 2.82 x 10^-40 J b) 1.6 x 10^-27 J c) 4.67 x 10^-19 J d) 4.67 x 10^-28 J I don't get any of these answers. =S Please help...
  46. Chemistry

    What is the chemical formula for this compound? sodium diamminetetrachloroplatinate(IV)
  47. chemistry

    why must a clean rod be used each time?
  48. Chemistry

    bond angles and polarity for trans-PF3Cl2
  49. chemistry

    HOW MANY LITERS OF H2 must react to produce 75.0g of PH3
  50. Chemistry

    Determine the density of CO2 gas at STP.
  51. chemistry

    Does a precipitate form if HCl and Ba(NO3)2 are mixed?
  52. Chemistry

    what are the relative strengths of the different intermolecular forces?
  53. chemistry

    What would happen if NaOH was added to CuSO4
  54. Chemistry

    Which of the following ions is paramagnetic in the ground state: Na+ Zn+2 Ti+2 Sr+2
  55. chemistry

    calculation of molarity for RMgX after repair it.
  56. chemistry

    when we make CH3MgCl,we have to calculate its MOLARITY.how!
  57. chemistry

    Determine the heat of combustion of acetylene (C2H2).
  58. CHEMISTRY

    Determine the heat of combustion of acetylene (C2H2).
  59. CHEMISTRY

    Determine the heat of combustion of acetylene (C2H2).
  60. CHEMISTRY

    Determine the heat of combustion of acetylene (C2H2).
  61. CHEMISTRY

    Determine the heat of combustion of acetylene (C2H2).
  62. chemistry

    Idont know a search in jacs or other juornals
  63. Chemistry

    Determine the prcentage composition of the compund HCl?
  64. chemistry

    why solution always prepared in HCl and not in HNO3 ?????????
  65. Chemistry

    Determine the pH of 263 ml of solution which has [NH 4I] = 0.300 M. Kb = 1.74 × 10-5 for NH3(aq)
  66. Chemistry

    Determine the pH of 263 ml of solution which has [NH 4I] = 0.300 M. Kb = 1.74 × 10-5 for NH3(aq)
  67. Chemistry

    How do you work the problem 1:10 dilution of 75mL of 2.5M H2SO4
  68. chemistry

    How do you balance the equation NH3 + CuO > Cu + H2O + N2
  69. Chemistry

    Calculate the[OH-] of a solution of 0.1861M CH3CH2CH2NH3CL if Kb= 5.1*10-4 for CH3CH2CH2NH2
  70. chemistry

    how many iron atoms are in 0.550 mol of Fe2O3?
  71. chemistry

    4. How would you convert 9.0 grams of water to moles?
  72. chemistry

    how many mL of 0.50 M ammonia would be needed to react with 1.0 L of 0.75 M HClO4
  73. Chemistry

    Fe(NO3)3+LiOH -> Fe(OH)3 + LiNO3 I cant get this balanced please help!
  74. chemistry

    What is the lewis dot diagram for menthol? (C10H20O1)
  75. chemistry

    How many milliliters of 3.60 {\rm M} {\rm HCl} are required to react with 140 {\rm mL} of 1.60 {\rm M}{\rm Al}({\rm OH})_{3}?
  76. chemistry

    if atoms give off light, why don't they glow?
  77. Chemistry

    What is the Delta H value for water that is evaporation in Joules?
  78. chemistry

    how many grams of NH3 are in 250 ml of a 20% (w/v) ammonia solution
  79. chemistry

    What are the oxidation numbers for the elements in the compound C2H5COOH?
  80. Chemistry

    How many grams of bromine can be obtained by the decomposition of 92.0 of MgBr2?
  81. chemistry

    what solution of sugar in water has the highest molarity?
  82. chemistry

    NaOH(aq)+H3PO4(aq)¨Na3PO4(pq)+H2O(l) Please help.
  83. Chemistry

    What is the pH for the potassium propionate solution at the equivalence point?
  84. chemistry

    what is the reagent responsible for the formation of hydrogen sulfide?
  85. Chemistry

    What is the [H+] of a 0.1 M malonic acid with a Ka of 10^-9 solution? I thought it was just (Ka x Ca)^(0.5), but that doesn't get me a pH of 5.
  86. chemistry

    how can i know whether solution is acidic or not and then what type of acid?
  87. Chemistry

    HC2H3O2 + CH3(CH2)4OH (H2SO4)=?
  88. chemistry

    SiH3- planar or pyramidal geometric shape?
  89. Chemistry

    How many grams of H2SO4 are contained in 4.5L of .30 N sulfuric acid?
  90. Chemistry

    Use the standard reduction potentials in volts: Cu^2+ --> Cu+ +0.16;
  91. chemistry

    2.50x10 to the second power mL of 0.100M NaBr
  92. Chemistry

    How do you draw the lewis strusture for Cyanogen(C2N2)
  93. Chemistry

    Determine the solubility of FeS at 25 degrees Celsius
  94. chemistry

    What is the molarity of hcl is 35 ml is neutralized. By 500 ml of M NaOH?
  95. chemistry

    how much of 0.5normal fas is equal to molar
  96. chemistry

    The reactivity of the alkali metals increases in the order? A. Na, K, Li B. K, Na, Li C. Li, Na, K D. Li, K, Na
  97. chemistry

    how many moles of NaOH (aq) is contained in 10.0mL of vinegar?
  98. Chemistry

    What happens to the rate of a reaction if the temperature is decreased and why?
  99. chemistry

    what are the factors that determine the rate at which a soulute dissolves
  100. Organic Chemistry

    how to calculate specific observed rotation?
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