CHEMISTRY (WEBWORK)

59,669 results, page 90

  1. chemistry

    what change occurs when sucrose solution is heated?Give evidence.
  2. chemistry

    If 80g of NaOH is added to 100mL water, what is the pH of the resulting solution?
  3. chemistry

    4g NaOH is dissolved in 100mL of 2.5M H2SO4 will be required for its complete neutralization?
  4. CHEMISTRY BALANCING CHEMICAL EQUATION

    H2SO4 + NaOC = Na2SO4 + H2O
  5. chemistry

    how many grams of c2h6o contain the same number of oxygen atoms as 0.75 mol of h2o?
  6. chemistry(check my answer)

    For the cell: C(s) C+(aq) B+(aq) B(s). Metal ______ is the "negative" electrode. is it C(s)
  7. Chemistry

    In a double-stranded DNA molecule, the percentage of Guanine can never be more than ___%. Why?
  8. Chemistry

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

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

    Which of the following is not a part of the scientific method? A. hypothesizing B. experimenting C. observing D. proving D?
  11. chemistry

    Classify each of the following mixtures as homogeneous or heterogeneous: 1. Shampoo 2. Vegetable Oil
  12. chemistry

    you have 2.0 grams of water at 0 degrees Celcius. how many kilojules of heat will freez it?
  13. College Chemistry

    Does Vapor Pressure decrease as intermolecular forces increase???
  14. chemistry

    in todays experiment what length of magnesium ribbon would be required to generate 42.00 ml's of H2?
  15. CHEMISTRY

    If 2.5 * 10^-2 g of Fe(NO3)3 added to 100mL of 1.0 * 10^-4 M NaOH solution , will it produce precipitate ? thank you
  16. chemistry

    what is another way you could determine the enthalpy of formation of magnesium oxide beside the experimental method?
  17. Chemistry

    How much do 8.36 × 1022 molecules of water weigh? Answer in units of grams
  18. Chemistry

    Regarding previous post: I don't understand what I'm doing. My book says the answer is .50 M Ba(NO3)2 but I'm not getting that.
  19. chemistry

    draw a newman projection of the most stable conformation of 2,3-dichlorohexane looking down the c3-c4 bond
  20. Chemistry

    Calculate the pH of a mixture of 20.0 mL of 0.150 M HCl and 10.0 mL of 0.300 M NaOH.​[7.00]
  21. Chemistry

    What factors do you need to consider if you wish to use the volumetric method for preparation of stock ethanol solutions?
  22. chemistry

    Calculate the loss in mass if 20.2g of KNO3 crystals was completely decomposed(K=39,N=14,O=16
  23. chemistry

    If you burn methane(CH4)and methyl alcohol(CH3OH)which gives off more heat
  24. Chemistry

    What is the mole fraction and mass percent of NaCl when the molality is 1.71m?
  25. chemistry

    How many moles of FeCl3.6H2O are required to make 10.00 mL of 1.50 M stock solution?
  26. chemistry

    how many milliliters of 6.00 M HCl are required to react with 60.0 ml of 1.96 M Al(OH)3? Al(OH)3(s)+3HCl(aq)-->AlCl3(aq)+3H2)(aq)
  27. chemistry

    What is the mass (in kilograms) of a cube of silver that measures 0.26m on each side
  28. chemistry

    The following reaction consumes 2.40 kg of CO, How many total liters of gas are formed at STP?
  29. chemistry

    if you burn 20.2g of hydrogen and produce 1.80x10^2g of water, how much oxygen reacted?
  30. Chemistry

    When you drop an antacid tablet into water is it endothermic or exothermic? Please explain. Thank you.
  31. chemistry

    When you mix baking soda with vinegar is the reaction endothermic or exothermic?
  32. chemistry

    why is the energy difference for t-butylcyclohexane significantly greater than the corresponding value calculated for methylcyclohexane?
  33. chemistry

    how many grams of KClO3 will dissolve in 1 liter of water at 50 degree celisus ?
  34. chemistry

    express liquid pentanol and gaseous oxygen as a chemical reaction
  35. chemistry

    A 200 mL sample of 1.0 M nitric acid is added to 1.0 M water. What is the resulting pH?
  36. Chemistry

    AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l)
  37. Chemistry

    what tests can be run to identify the cation and anion of an ionic compound?
  38. chemistry

    the enzyme that takes in the SO2−4 that provides the sulfur atom for cysteine.
  39. chemistry

    What mass of hydrochloric acid (in grams) can be neutralized by 2.7 of sodium bicarbonate?
  40. Chemistry

    How many seconds does it take to deposit 81.5 g of Zn on a steel gate when 21.0 A is passed through a ZnSO4 solution?
  41. Chemistry

    ISO electrons series S2-,CL-K+,Ca2+ are ions increase and decrease.
  42. chemistry

    what is the external pressur, if ethanol is boiling at a temperature of 70 degrees celsius
  43. chemistry

    what is the net ionic equation for FeSO4 + KCl = FeCl2 + K2SO4?
  44. chemistry

    I don;t understand this question. NaOH(aq)+H3PO4(aq)¨Na3PO4(pq)+H2O(l)
  45. chemistry

    what is the pH of the solution formed when 25 mL of 0.173 M NaOH is added to 35 mL of 0.342 M HCl?
  46. chemistry

    how to prepare 500ml of a 0.75M Sodium Phosphate buffer solution at pH 7.5, how would you go about doing that?
  47. Chemistry

    What would be a chemically reasonable formula for a compound consisting of each of the following pairs of elements: (a) K and F (b) N and S
  48. Chemistry

    What would be a chemically reasonable formula for a compound consisting of each of the following pairs of elements: (a) K and F (b) N and S
  49. Chemistry

    What mass of hydrochloric acid (in grams) can be neutralized by 2.7g of sodium bicarbonate?
  50. Organic Chemistry

    How would you purify biphenyl contaminated with fluorene? What method and solvent would you use?
  51. Chemistry

    What gas has the greatest "lifting power" in lighter than air balloons?
  52. Chemistry

    which of the following is the stongest oxidizing agent? 1.NaBiO3, 2. K2Cr2O7, 3. KMnO4, 4. PbO2
  53. Chemistry

    If your car gets 28 miles to the gallon, how many liters of gasoline are necessary to travel 157 km?
  54. Organic Chemistry

    After extraction with bicarbonate,in which form is benzoic acid now in solution?
  55. CHEMISTRY

    WHAT IS THE COST PER KJ TO PRODUCE METHANOL, ETHANOL, PARIFFIN, PROPANOL,AND BUTANOL?
  56. Chemistry

    Rank the following Bronsted acids from strongest to weakest: H-SH H-CH3 H-NH2 H-F H-I
  57. Chemistry

    How to determine the energy in J calories and K to convert one pound of ice to steam
  58. Chemistry

    What volume does a mixture of 14.2 g of He and 21.6 g of H2 occupy at 28 degrees celcius and 0.985 atm?
  59. Chemistry

    Is this true or false Both sublimation and melting are considered endothermic processes.
  60. chemistry

    what is the pH of the solution formed when 25 mL of 0.173 M NaOH is added to 35 mL of 0.342 M HCl?
  61. Chemistry

    You are to prepare a KH2PO4 and Na2HPO4 solution with pH=7.31. What should the concentration of [2(HPO4) 2-] / [H2PO4-]
  62. chemistry

    0.315 M 2(NH4)SO4 and 0.488 M NH3 Calculate concentration of OH
  63. Chemistry

    What is the trend in atomic size in the series of Group IIA elements Be through Ra?
  64. chemistry

    suggest how the ester might be separated from any unreacted ethanoic acid or methanol
  65. chemistry

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

    109% of carbon,18,2% of hydrogen and 73% of oxygen how do i calculate emperical formular?
  67. AP Chemistry

    how do you balance a redox equation like: Bi(NO3)3 + Al + NaOH = Bi + NH3 + NaAlO2 ??
  68. chemistry

    2NOBr(g) <==> 2NO(g) + Br2(g) and the value of Kc = 1.98, at a temperature of 282 K what is the value of Kp ? (Hint: Use the value of R in the appropriate units.)
  69. chemistry

    At what temperature does 14.2 g of nitrogen gas have a pressure of 3.25 atm in a 14.0 liter tank?
  70. Chemistry

    If 125 g of ice at 0.0°C is added to 1.95 L of water at 90 °C, what is the final temperature of the mixture?
  71. Chemistry

    a mothball composed of naphthalene has a mas of 1.06g. how many napthalene molecules does it contain
  72. Chemistry

    A sugar crystal contains approximately 1.7x10^17 sucrose. What is its mass in milligrams?
  73. chemistry

    sodium cyanide nacn, contains how many single, double or triple bond?
  74. chemistry

    How many grams of HCOOH are needed to make 3.7 liters of aqueous solution of pH=3.5?
  75. Chemistry stoichiometry

    How many grs of H2SO4 is required to obtain 0.1 molal of 1 kg solution?
  76. Chemistry

    How do you determine the number of moles in 78.6 grams of carbon tetrachloride (CCl4) ?
  77. Chemistry

    Calculate the pH and concentration of H3O+ of a 0.285M oxalic acid solution.
  78. chemistry

    wHAT IS THE MOLALITY OF A SOLUTION MADE BY DISSOLVING 43.3 GRAMS OF SODIUM CHLORIDE?
  79. chemistry

    how to prepare 1M,50ml buffer solution by taking Na2HPO4 and NaH2PO4.
  80. Chemistry

    Find the number of molecules of sodium bicarbonate present in 5.08 gram
  81. Chemistry

    Why does the color of Methyl Orange change at all in he presence of buffer components?
  82. chemistry

    How can I change ca(hco3)2+cl(aq)=cacl2(aq) + co2(g) + h2O in to ironic equation?
  83. chemistry

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

    How is collaboration necessary and important for scientific advancement. use examples from the atomic theory please help
  85. Organic Chemistry

    2 methyl-2-propanol is treated with 9M H2S04. What is the mystery product?
  86. Chemistry

    How many grams of H2SO4 are needed to make a 4.50 m solution in 300 g H2O?
  87. CHEMISTRY

    What pressure would be required to form a 0.045 M solution of helium (kH = 3.7 x 10-4 M/atm) at 25 °C????
  88. Chemistry

    What volume of 1.45 H2SO4 is required to neutralize .050L of .75M KOH?
  89. chemistry

    how does the number of electron pairs around a central atom determines its shape
  90. Chemistry

    What variable always appears in any reaction rate calculation? Would that be time?~seconds/s?
  91. chemistry

    what must be done with the radioactive waste materials that result from splitting atoms and how is this a problem?
  92. chemistry

    Calculate the mass of oxygen which will be evolved on heating 5g of potassium Trioxochlorate(v)
  93. Chemistry

    How do you write a chemical equation for NH4NO3? Is it... NH3 + H2O= NH4 + OH
  94. chemistry

    why does water,oil,acetone and isopropanol have the same concave meniscus shape?
  95. chemistry

    Why does acetone evapourate faster than water in terms of intermolecular forces
  96. Chemistry

    Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.
  97. chemistry

    What volume of O2 at 912 mmHg and 33 degrees C is required to synthesize 11.0 mol of NO?
  98. Chemistry

    What variable always appears in any reaction rate calculation? Would that be time?~seconds/s?
  99. chemistry

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

    Calculate the mass of oxygen which will be evolved on heating 5g of potassium Trioxochlorate (v)
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