CHEMISTRY (WEBWORK)

59,751 results, page 82
  1. chemistry

    write balanced equation of the reaction of bromine and sodium thiosulfate
  2. chemistry

    Considering a 1.0M of each solution, which has the greatest osmolarity? 1. FeCl3 2. K2O 3. HCl 4. HC2H3O2
  3. chemistry

    How many mL of 0.100M HCl are needed to neutralize 49.0mL of 0.104M Ba(OH)2 solution?
  4. chemistry

    freezin point of the solution 25.5g c7h11no7s in 1 x 100gh2O (nonionizing solute)
  5. Chemistry

    Calculate the mass of each compound containd in 60g of a 4.5%m/m CaCl2(aq)solution
  6. chemistry

    how much lithium hydroxide will be needed to remove 75.0 grams of carbon dioxide?
  7. chemistry

    if your smoke detector contains 0.10 mg of 241Am how long will it take to decay 1.25times10 to the second power
  8. chemistry

    How much concentrated 12 M hydrochloric acid is needed to prepare 100.0 mL of a 2.0 M solution?
  9. ap chemistry

    pentane is burned completely in oxygen gas. what is the balanced equation?
  10. chemistry

    Na + H2O ¨ NaOH + H2 How many moles of H2 would be formed from 30 grams of Na in the following (UNBALANCED) equation?
  11. chemistry

    Calculate the volume needed to dissolve 11.2g CuSO4 to prepare 0.140M?
  12. Chemistry

    Calculate the temperature at which k = 2.0 s-1 if k = 10.0 s-1 at 371 K. The activation energy for the reaction is 30.0 kJ mol-1.
  13. Chemistry

    How much heat is evolved when 6.688 moles of Cu(s) is burned in excess oxygen
  14. chemistry

    Write the double-replacement reaction of HgCl2 reacting with Na2CO3.
  15. chemistry

    how many grams of manganese (4) oxide are needed to make 5.6 liters of a 2.1 solution
  16. Chemistry

    25 mL of NaOH 0.16 M is added to 50 mL of 0.1 M HCl. What is the concentration of hydroxide ions in the solution?
  17. Chemistry

    Calculate the volume of NaOH 0.5 mol/L necessary to neutralize 300 mL of HCl 0.2 M.
  18. Chemistry

    When NiCl2.6H2O dissolves in water, what does it form (i.e. balanced equation)?
  19. chemistry

    Write the double-replacement reaction of PbCl2 reacting with Na2CO3.
  20. ap chemistry

    What minimum volume of .2M Na2CO3 is needed to precipitate all the Sr 2+ from 25mL of .1M Sr(NO3)2
  21. chemistry

    How to compare the melting point of two ionic bod or two covalent bond?
  22. Chemistry

    what is the importance of the weak intermolecular bonding in organic carbon compounds
  23. Chemistry

    What is the density(g/L) of a gas mixture that contains 27.0% Fe and 73.0% He by volume at 714 mm Hg and 27.5 degrees Centigrade?
  24. Chemistry

    How many milliliters of 3.0 M NaOH are required to react with 0.50g of Cu2+ to form Cu(OH)2?
  25. college chemistry

    how do I calculate the amount of heat lost by the metal, qmetal?
  26. chemistry

    C3H8(g)+5O2(g)-->3CO2(g)+4H2O(l) what reactant is oxidized and which is reduced?
  27. chemistry

    How many grams of sodium chloride are needed to prepare 250 mL of a 2% solution?
  28. chemistry

    what is the concentration of NaCl if 10 grams are dissolved in enough water to make 12 liters?
  29. Chemistry

    the chemical dichlorobenzne will not disolve in water, what muct the polarity of dichlorobenznebe by and why?
  30. chemistry

    How much heat is evolved when 1258 g of water condenses to a liquid at 100.°C?
  31. Chemistry

    imagine that you have a 100 ml of HCl, after adding 50 ml of 1M NaOH, how many moles of OH did you add
  32. chemistry

    What mass of sodium iodide (NaI) is contained in 135 mL of a 7.0% (m/v) soulution?
  33. chemistry

    What is the density of a sphere with a radius of 12.7 meters and a mass of 285 kilograms?
  34. chemistry

    how many moles of Fe2O2 would be formed by the action of Oxygen one kilogram of iron?
  35. chemistry

    how do you identify the base in this reaction? h2o(L) + CH3NH2(aq) yields OH-(aq) + CH3+(aq)
  36. Chemistry

    imagine that you have a 100 ml of HCl, after adding 50 ml of 1M NaOH, how many moles of OH did you add
  37. chemistry

    What mass in kilograms of E85(d = 0.758g/mL) can be contained in a 11.5gal tank?
  38. Chemistry 212

    What is the solubility of RaSO4 in 0.1381M Na2SO4? Ksp = 4.3x10^-11?
  39. Chemistry

    25g of ethanol is dissolved in 1.50 kg of whater. what will the boiling point of the solution be?
  40. chemistry

    How many grams of water should you add to 31.0g of sucrose,C12H22O11, to get a 0.855 m solution?
  41. chemistry

    What is the pH of a solution made by dissolving the 37 g of KOH in 500 mL of water, with no buffer in it?
  42. Chemistry

    7.8 g of calcium fluoride is dissolved in 100 L of water at 25°C. Will a precipitate be formed?
  43. physical chemistry

    What is a typical speed for a N2 molecule in this room? a) 50 m/s b) 500m/s c) 1500 m/s
  44. Chemistry

    What is the equation for the synthesis of isopropyl butanoate from isopropanol and butanoic acid
  45. organic chemistry

    calculate the mass in grams of 10.0ml if mercury (Hg) is the density Hg 13.6g/ml
  46. 9th grade chemistry

    How do you determine the density of 22 ml of a blue liquid that has a mass of 51.1g
  47. CHEMISTRY

    how much energy would be released in the following reaction CH4 + 2O2--> CO2 + 2H2O
  48. chemistry

    how many grams of calcium nitrate are needed to make 100mL of a 0.5M solution
  49. Chemistry

    Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
  50. chemistry

    what is the molarity if 0.5 grams of sodium chloride is dissolved to make 0.05 mL of solution?
  51. chemistry

    the amount of K2Cr2O7 required to prepare 100ml of its 0.05N solution
  52. chemistry

    When a 16.9-g sample of NaOH dissolves in 70.0 g of water in a calorimeter, the temperature rises from 22.4°C to 86.6°C.
  53. chemistry

    With a half-life of 14.3 years, how long will it take for100 g of phosphorus32 to decay to 12.5 mg?
  54. chemistry

    Calculate the pH of a solution resulting from the addition of 10.0 mL of 0.10 M NaOH to 50.0 mL of 0.10 M benzoic acid (Ka = 6.5 x 10 -5
  55. Chemistry

    Which indicator can be used to detect the endpoint of a species that has Ka=1.1 x 10E-8? I used phenolphtalein? is that correct?
  56. Organic Chemistry

    How do I make an IR Spectrum of C6H12S2 (Allyl Propyl Disulfide)
  57. Chemistry

    Which of the following compounds contains 57.5% sodium by mass? *NaI *NaOH *NaHCO3 *NaSO3
  58. chemistry

    how many grams of NaOH would be needed to make 896mL of a 139 M solution
  59. chemistry

    Explain how strong acid solutions conduct an electric current.
  60. Chemistry

    Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
  61. Chemistry

    How many grams of CaCl2 would be required to produce a 3.5M(molar) solution with a volume of 2.0L?
  62. Chemistry

    What is the limiting reagent when 150.0 g of nitrogen react with 32.1 g of hydrogen? N2(g) + 3H(g) > 2NH3(g) Thank you
  63. chemistry

    Calculate the pH of a 0.800 M NaCH3CO2 solution. Ka for acetic acid, CH3CO2H, is
  64. chemistry

    Given the plot of 1 vs 1ni2, what is the value of nf? y=-0.011x+0.0027 R^2=1 1/n(initial)^2=.04 1/lambda=.0023
  65. Chemistry

    Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
  66. chemistry

    What quantity of ice at 2 deg Celsius can be melted by 100 J of heat?
  67. Chemistry

    Would the R (PV=nRT)value go up or down if you had not corrected the gas for partial pressure of water? I was thinking down but im not sure
  68. chemistry

    what is the concentarion of hyrdoxide ions in 250ml 1.1mol/l of calcium hydroxide
  69. chemistry..

    to drbob222 ok, the pka (hclo) = 7.54 the ph = 7.35 this problem was under "preparing a buffer" section
  70. Chemistry

    Would water-insoluble alcohols, like 1-octanol, be soluble in aqueuous NaOH?
  71. Chemistry

    list in order from most ionic to most covalent kbr, Hcl, NaF, N2,
  72. Chemistry

    The accepted value of a quantity is 4.70g. If the measured value is 4.98g what is the percent error?
  73. chemistry

    If a solid is produced, after Silver Nitrate is added, what eventually might happen?
  74. chemistry

    Thank you Dr.Bob for your speedy reply-I also tutor in other subjects, but chem. is my nemesis.
  75. chemistry

    The concentrations of Ca and Na in a sample of river water are 13.4 mg/kg and 5.2 mg/kg. Express the concentration in molality
  76. Chemistry

    the mass of 4 moles of Co2 is ? (1)22g (2)44g (3)88g (4)176g please help !
  77. chemistry

    the announced attendance at a football game was 52,806. is this an exact number?
  78. Chemistry

    what is the molality of a solution prepared by dissolving 13.0 g of Ba(NO3)2 in 450 g of water?
  79. chemistry(help please)

    Which acid,if it reacts in tincture of NaOH forms sodium hypochlorite?
  80. chemistry

    2. If you used 0.500 g of Mg and an excess of HCL, how much hydrogen gas should be produced at STP?
  81. chemistry

    How do you write a conversion factor relating cubic centimeters and milliliters?
  82. Chemistry

    If 57j of heat are added to an aluminum can with a mass of 17.1g, what is its temperature change?
  83. Chemistry

    Which quantity of particles is correctly represented by the formula H2SO4? Explain.
  84. chemistry

    How would you prepare the following solutions? A)2%NaCL(w/v) B)0.35M glucose C)0.12M CaCI2
  85. chemistry

    What is the longest possible continuous corbon chain in the compound 3,5,5-trimethyloctane? 10, 9, 8,or 6 carbons?
  86. Chemistry

    How many grams of KOH will be needed to boil a liter of cold water?
  87. Chemistry

    Describe how you would prepare 2.00 L of an aqueous solution having a pH of 3.60 if you had a supply of 0.100 M HCL
  88. chemistry

    what is the concentration, in % m/m of a solution prepared from 50.0g sodium chloride and 150.0g of water
  89. chemistry

    when should the temperature be recorded for an experiment in order to determine the boiling point?
  90. Chemistry

    How many milliliters of 1.5 M NaHCO3 would it take to neutralize 300 mg of Benzoic Acid (C7H6O2)
  91. Chemistry

    How many grams of CaSO4 are present in 320ml of a 0.00810 M solution of this compound?
  92. chemistry

    I have 50mL of0.2M of potassium permanganate solution.What is the Molarity of KMnO4?
  93. chemistry

    Assuming a temperature of 37 C and 1 atm pressure, how many mol/min of CO2 is this?
  94. Chemistry

    What pH is required to start precipitation of Fe(OH)3 from a 0.380 M solution of FeCl3? Ksp of Fe(OH)3 = 4.0e-29.
  95. chemistry

    how many atoms are present in a sample of water molecules with a mass of 1.800g
  96. Chemistry

    How many grams of NaF should be added to 612 ml of 0.4 M HF (Ka = 6.8 x 10-4) to produce a buffer solution where pH = 3.10?
  97. chemistry

    How many grams of solid KOH are needed to prepare 100.mL of a 1.7 M solution?
  98. chemistry

    How many mL of 0.750 M HCl are needed to neutralize 14.89 mL of 0.350 M NaOH? ____ mL
  99. Chemistry

    How much energy would be released when 675 grams of steam is condensed to water
  100. 10th grade chemistry

    How many grams of kno3 can be dissolved in 100g of h2o at 50°c