CHEMISTRY (WEBWORK)

59,440 results, page 91

  1. chemistry

    calculate the volume occupied by 10^22moleculesof a gas 300k and 760mm pressure
  2. Chemistry

    What is the balanced equation for copper (II) sulfate pentahydrate and potassium oxalate monohydrate?
  3. chemistry

    how much NaOH which is 25% pure required to neutralise 100mL 10N HCl
  4. Chemistry

    I am stuck on this question: what mass of KCl in grams when 2.00 lbs KC10 3 is decomposed?
  5. chemistry

    Potassium permagnate +ferrous sulphate+ sulphuric acid molecular formula
  6. chemistry

    Please...how do you calculate the reduction potential for 1 M CuSO4? I've been trying for hours......!!
  7. chemistry

    how much heat is required to melt 15 g of ice which is at a temperature of 0 degrees celsius
  8. Chemistry

    8 mL of 2.5 M phosphoric acid is neutralized with 500 mL of potassium hydroxide. What is the concentration of the base?
  9. Chemistry

    What volume (in liters) is occupied by 3.85×10^22 nitrogen molecules at 105 C and 255 mmHg?
  10. chemistry

    How many moles of HNO3 are present if 0.236mol of Ba(OH)2 was needed to neutralize the acid solution?
  11. Chemistry

    Suppose you have a strong peak at 2230 cm–1. What is the wavelength of the radiation that was absorbed?
  12. Please help. Chemistry

    What is the MAIN reason for storing sodium metal in mineral oils?
  13. chemistry

    the density of alcohol is 0.789 g/ ml at 20 degree celcius . calculate the mass of a 30 ml sample?
  14. Chemistry

    How many grams of SO3 are needed to make 250 ml of 0.750 molar solution?
  15. Chemistry

    Given 1.7 g of hydrobromic acid (48%) calculate the number of mL. (MW HBr: 80.91 g/mol, density: 1.49 g/mL)
  16. Chemistry

    What is the solubility of benzoic acid in room temperature water. Report this in grams/L.
  17. chemistry

    your in seam is 35.0 in.how many cm is this?show your final answer with units and correct sig figs.
  18. chemistry

    What is the density of a substance that weighs 500g and fills a container that is 1/2 liter in size?
  19. Chemistry

    Which hydrocarbon is least likely to dissolve in water - hexane, butane, decane?
  20. Chemistry

    Calculate the number of grams necessary of C6H12O6 to make 1.00 ml of 0.025 M glucose.
  21. chemistry

    when you burn ionic and covalent compound using Bunsen burner,what you will see?
  22. Chemistry

    How many hydrogen bonds can an ethanol molecule form to neighboring water molecules ? Why?
  23. chemistry

    Vacuum filtration is avoided when crystals are isolated from a very volatile solvent. why?
  24. Chemistry

    Is 3HCl(aq)+HNO3(aq)->Cl2(g)+NOCl(g)+2H2O(l) an oxidation-reduction reaction?
  25. chemistry

    What is the density of a 23.92 g object block if the dimensions: length = 10.6 mm height = 5.47 cm width = 0.0352 m
  26. General Chemistry

    Which chemical reactions would you consider to be of importance to a healthcare professional and why?
  27. chemistry

    convert the following measurements to the units specified 1) 357ml = ?L 2) 25kg = ?mg 3) 35,000cm = ?L
  28. chemistry

    convert the following measurements to the units specified 1) 357ml = ?L 2) 25kg = ?mg 3) 35,000cm = ?L
  29. chemistry

    How would you prepare 500 ml of a 1.8 M phosphate buffer (pH 6.8) containing 4.5 x 10-6 M CaCl2 and 52 mM sucrose?
  30. chemistry

    -What volume of .500 M Pb(NO3)2 is required to react completely with 18.25 L of .625 M Na2SO4?
  31. chemistry

    -What volume of .500 M Pb(NO3)2 is required to react completely with 18.25 L of .625 M Na2SO4?
  32. chemistry

    why should we add 273 to convert a given celcius value in to kelvin?
  33. chemistry

    calculate the volume in milliliters of a 5.55g sample of solid with density of 3.67g/ml
  34. chemistry

    about how many bacteria (e coli) would you have to line up to stretch 1mm??
  35. Chemistry

    How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?
  36. Chemistry

    how would you prepare 500 ml of .2M solution starting with solid NaH2PO4*H20?
  37. chemistry

    what was the precipitate formed of pottasium bromide and lead nitrate mix with water?
  38. Chemistry

    In industrial plants, what specific type of oil is used as heating medium?
  39. chemistry

    In industrial plants, what specific type of oil is used as heating medium?
  40. chemistry

    What mass of electrons would be required to just neutralize the charge of 1.4 of protons?
  41. chemistry

    What is the density of a sample of 65.0mL of automobile oil having a mass of 59.82g
  42. Chemistry

    A chemist requires 0.780 mol Na2CO3 for a reaction. How many grams does this correspond to?
  43. Chemistry

    What are washers, nuts, and bolts made of? Aluminum, Zinc, Iron, or Nickel?
  44. chemistry

    which of the ff are gases at 50 degrees celcius bromine, mercury, propane, radon, silver
  45. Intergated chemistry/physics

    What is the speed (in m/s) of an object that has a mass of 2.5 kilogram and a momentum of 1,000 kg m/s?
  46. chemistry

    What is the mass of 1120cm cube of hydrogen gas at 750mmHg and 40 degree celsius
  47. Chemistry

    In a titration of 35.00 mL of 0.737 M S, __________ mL of a 0.827 M KOH solution is required for neutralization.
  48. Chemistry

    In a titration of 35.00 mL of 0.737 M S, __________ mL of a 0.827 M KOH solution is required for neutralization.
  49. chemistry

    certain electromagnetic wavelenght radiation has frequency of 98hz .what will be its wave lenght?
  50. Chemistry

    Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25°C.
  51. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
  52. chemistry

    calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
  53. Chemistry

    What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?
  54. Chemistry

    Most of the matter in the universe is of which element? How and where do elements more complicated than this form?
  55. AP Chemistry

    What effect would a catalyst have on the rate of reaction for the decomposition of ozone?
  56. chemistry

    Approximately what electronegativity difference would you expect for a polar covalent bond?
  57. Chemistry

    What is the concentration of a solution made by diluting 95 mL of 6.0 M HCl to a final volume of 750 mL
  58. chemistry

    an ionic equation has 2H+(AQ)on the left side and H2(g) on the right. Are these species spectators? explain.
  59. chemistry

    calculate the relativistic mass of 1.81x10^24 photons (3.00 mol) with wavelength of 450 nm.
  60. chemistry

    what is the molarity of a h2so4 solution if 18.5ml of naoh are needed to neutralize 25.0 mL of the sample?
  61. Ap Chemistry

    What is the energy of a photon corresponding to radio waves of frequency 1.465 106 /s?
  62. chemistry

    Why adding NH4OH to Al3+ , forms Al(OH)3 and not complex ion Al(NH3)3 ? thanks so much
  63. Chemistry

    why would a molecule change color under acidic or basic conditions?
  64. chemistry

    3. What volume of 0.18M Na2CO3 would neutralize 25ml of the HCL solution?
  65. chemistry

    If 25.0mL of 0.56 M H2SO4 is diluted to a volume of 125 mL, what is the molarity of the resulting solution?
  66. chemistry

    A 150mL sample of 0.45 M HNO3 is diluted to 450 mL. What is the molarity of the resulting solution?
  67. Chemistry

    How many molts of H2O would be produced if 3.61 molt HCI react with an excess of Ca(OH)2?
  68. Chemistry

    How many moles of H2O would be produced if 3.61 molt HCI react with an excess of Ca(OH)2?
  69. Chemistry

    Please help me, determine the molarity of a solution containing 2.5 moles CuSO4 in 4.2 L of water
  70. chemistry

    I want to make a 3% potassium sulphate solution. How many grams or mg I need per 100 ml
  71. chemistry

    Calculate the grams of solute needed to prepare each of the following. 55.0 ml of a 6.50 hcl solution.
  72. Chemistry

    Express your answer as a chemical formula. 1.Cr^-3 and Br^- 2. Fe^3+ and O^2- 3.Hg2^2+ and CO3^2- 4.Ca^2+ and CIO^3- 5. NH^+4 and PO4^3-
  73. Chemistry

    Calculate the mass of CO2 emitted (in lbs) when 1 gallon of octane is burned
  74. chemistry

    what is the minimum of amount of KCN in moles needed to extract 29 grams of gold
  75. Chemistry

    550 mL of Ar at 632mm Hg will occupy what volume at 750mm Hg with the temperature remaining constant?
  76. Chemistry

    What role does a catalyst play in a chemical reaction in terms of rate and yield
  77. chemistry

    Which of the following does NOT belong with the others? A. HCl B. HNO3 C. H2O2 D. H3PO4 I say A
  78. chemistry

    Which ion is absorbed by a base in water? A. H3O+ B. OH- C. Neutron D. Transition metal B
  79. chemistry

    Calculate the mass in grams of 2.50 mol iron(II) hydroxide. A. 29.5 g Fe(OH)2 B. 184.5 g Fe(OH)2 C. 225 g Fe(OH)2 D. 3.38 x 10-2 g Fe(OH)2 C
  80. chemistry

    how many liters of O2 gas measured at 784mmHg and 25'C are required to completely react with 2.3 mole of Al?
  81. chemistry

    how many atoms of each element are present in five formula units of calcium permanganate?
  82. chemistry

    How many grams of solute are required to prepare 500ml of 0.5M urea solution,CO(NH2)2?
  83. chemistry

    What volume will a mixture of 5.00mol of He and 0.800 mol of CO2 occupy at STP?
  84. chemistry

    what is the molarity of the acid in when a 30mL sample of HCl is titrated with 10mL of 6M NaOH?
  85. Chemistry

    Hi, I need help with something. What are the correct formulas and names of manganese and oxygen compounds.
  86. Chemistry

    What is the final volume (L) of a 1.00 L system at 315 K and 1.10 atm if STP conditions are established?
  87. chemistry

    How many atoms of tin are necessary to react completely with 7.42 x 10(24th)g of HF. Sn(s) + 2HF(g) = SnF2(S) + H2 (g)
  88. Chemistry

    How many hours are required for the deposition of 15.0 grams of Al from molten AlCl3 by a current of 15.0 amps?
  89. Chemistry

    You dissolve 17.1 gms of sucrose (sugar) in 100 mL of ethanol 20ºC. What is the molarity (M)?
  90. Chemistry

    Is the bond in the molecular orbital energy level diagram of Li2 stable?
  91. Chemistry

    What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)
  92. Chemistry

    Write equatios for the ionization of the following acids. (a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.
  93. Chemistry 3A

    what is the maximum number of electrons that may occupy the second electron energy level?
  94. Chemistry 3A

    what is the maximum number of electrons that may occupy the second electron energy level?
  95. chemistry

    2NaClO2---> 2NaCl + 3O2 if 3.85 grams of NaClO3 react, how many moles of O2 are created?
  96. Chemistry

    What is the name (NOT THE NUMBER) of the group whose elements carry a neutral charge?
  97. Chemistry

    The relationship between ionization energies as evidence for electron configuration for elements?
  98. chemistry

    Only pure substance are homologous,true or false? Can you please explain too?
  99. chemistry

    Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091*10^6 g/mol.
  100. Chemistry

    How do you demonstrate that fog, clouds,and steam are liquid droplets and not water vapor?
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