CHEMISTRY (WEBWORK)

59,669 results, page 100

  1. chemistry

    Determine the mass of copper that has the same number of atoms as there are in 15.46 mg of gold. Answer in units of mg.
  2. Chemistry

    When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?
  3. Chemistry

    can anyone explain how does the balanced chemical equation show the law of conservation of mass?
  4. chemistry

    Calculate the PH and POH of an aqueous solution that is 25.00% of HCL by mass and density of 1.35g/ml
  5. chemistry

    Calculate the normal freezing point of an aqueous solution containing 30% w/w ethylene glycol. Thanks
  6. Chemistry - Solutions

    Do all solutes show an increase in solubility with increasing temperature? Explain.
  7. chemistry

    If you begin with 0.030 L of a 2.5M NaOH solution, what concentration will you end up with if you dilute it to 0.050?
  8. chemistry

    How many grams of copper can be dissolved by 20.0 mL of a 69.6% (by mass) nitric acid solution that has a density of 1.41 g/mL?
  9. chemistry

    find the molar solubility of zinc carbonate if its ksp=1.5x10^-10. (at 298K)
  10. Science - Chemistry

    I need help I've got 2 books and they both tell me different things. I need to know the 3 different ways of extracting salt, how it's done, the advantages and the disadvantages of each one?? Please Help!!!
  11. Chemistry II

    Calculate the pH at the equivalence point in the titration of 50ml of 0.20 M methylamine (Kb=4.3*10^-4) with a 0.40 M HCL solution.
  12. chemistry

    How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?
  13. chemistry

    how many grams of solid NaOH are required to prepare 200.0 mL of a .050 M solution?
  14. chemistry

    Calculate the PH and POH of an aqueous solution that is 25.00% of HCL by mass and density of 1.35g/no
  15. chemistry

    If a graduated cylinder wasn't calicrated correctly, how would that affect the results of a measurment?
  16. Chemistry

    Can someone help draw/explain the Lewis Dot Structure for OPBr3. I've tried different things, but none of them seem to work.
  17. Chemistry: Le Chatelier's

    What happens when CoCl2 is added to the following system? Co(H20)6 + Cl + heat <-> CoCl4 + 6H20?
  18. Chemistry Help

    If you mixed 10.0 mL of calcium nitrate and sodium phosphate, both 0.250M,which of the two would be the limiting reactant?
  19. Physical Chemistry

    What is the mole fraction of alanine in 0.314m CH3CH(NH2)COOH(aq)?
  20. chemistry

    Write a net equation for the reaction between aqueous solutions of NaHSO4 and NaCN.
  21. chemistry

    Write a net equation for the reaction between aqueous solutions of HBr and NH3.
  22. Chemistry

    What mass of methane must be combusted to produce 1.00 x 10^3 kJ of heat? could someone write the equation and the answer? Thank You.
  23. chemistry

    Considering the reaction i2 h2=2hi energy change =( tive) and give reasons how "HI" will be produced
  24. chemistry

    Write a net equation for the reaction between aqueous solutions of NaNO2 and NaH2PO4.
  25. chemistry

    Write a net equation for the reaction between aqueous solutions of NH4Cl and Na2SO3.
  26. Chemistry

    What is the concentration when each of the following is dissolved in 1.50 L of water: a) 3.00 moles of NaCl b) 10 g of KCl c) 110 mg of NaCO3
  27. Chemistry--help me, please

    how would you separate Fe3+ from Ba2+ in a mixture? Please explain and give an equation for reaction.
  28. chemistry

    What are the advantages of a gas as a coolant? (instead of heavy/normal water) (in a fission reactor)
  29. chemistry / science

    With regard to Stainless Steels, how is a passive layer regenerated? thanks in advance!!
  30. chemistry

    What has the lowest surface tension and why? CH3CH2CH2CH3, (CH3)2CO, C6H6, H20
  31. chemistry

    calculate the degree of polymerization of polystyrene with a molecular weight of 3.091e6 gm/mol
  32. Chemistry

    How many grams of Na3PO4 are needed to produce 250mL solution that has an Na concentration of 1.04M?
  33. chemistry

    I need help with this problem: if you want to reduce the strength of 100 mL of 10 N NaOH to 3N, how much water would you need to add? Thanks in advance.
  34. Chemistry

    how many grams of hydrogen make up 3.5 moles of glucose C6H6O6? a 1.7g b 3.5g c21.0g d 101.5g
  35. Chemistry

    How many milliliters of 0.135 M HCl are needed to completely neutralize 56.0 mL of 0.101 M Ba(OH)2 solution?
  36. chemistry

    Write a net equation for the reaction between aqueous solutions of Na2HPO4 and H2CO3.
  37. chemistry

    Write a net equation for the reaction between aqueous solutions of HClO4 and NaH2PO4.
  38. chemistry

    when a charged rod is brougth closer to a stream of ethanol it bends? explain why?
  39. Chemistry

    3.5 liters of H2O are added to 500 mL of a 2.0 M HNO3 solution. What is the resulting molarity?
  40. chemistry

    What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?
  41. Chemistry 121

    How many grams of KCl would be produced from the complete decomposition of 2.75g of KClO3?
  42. chemistry

    Write a net equation for the reaction between aqueous solutions of NaC2H3O2 and H3PO4.
  43. chemistry

    how many grams of calcium bicarbonate would it take to reach a ph of 7 if i have 10ml 3 molar sulfuric acid?
  44. AP CHEMISTRY

    Write a balanced equation for the neutralization of each of the following: H2SO4(aq) and NaOH(aq) HCl(aq) and Fe(OH)3(s) H2CO3(aq) and Mg(OH)2(s)
  45. chemistry

    Calculate the concentration of each solute and each ions when 25.0 mL of 18.0 M H2SO4 is mixed with 130.0 mL water
  46. chemistry ASAP

    name the following: H2SeO3 H2TeO2 PO3^3- HCLO4 Please explain how to find the names !!!!!
  47. chemistry

    consider the following reaction: Mg(s)+ 2HCl(aq) --> MgCl2 (aq)+H2 (g) What minimum amount of 1.75 M HCl is necessary to produce 27.5 L of H2 at STP?
  48. chemistry

    what volume of .5 m sulfuric acid is needed to react completely with 10 mL of 2m potassium hydroxide
  49. chemistry

    Calculate the volume occupied by 7g of nitrogen gas at 27 degree c and 750 mm of hg pressure
  50. chemistry

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

    Determine the structure of the compound by using the IR and 1H NMR of a spectra that has the molecular formula: C4H8O2
  52. chemistry

    What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?
  53. Chemistry

    What is the minimum volume of 2.6 M HBr required to completely dissolve 35.0 g of potassium metal?
  54. chemistry

    How many moles of Cu2+ ions are present in 1L of .125M CuSO4:5H2O solution?
  55. chemistry

    how many grams of Copper (II) sulfate pentahydrate would you use to make 400.0 mL of .750 M solution?
  56. chemistry

    Balance the following equation in basic media CLO3 (-1) +I (-1) --------->CLO2 +I2 please i need the final answer too
  57. Chemistry

    At what initial concentration would a solution of acetic acid (ka=1.8x10^-5) be 2% ionized? I am stuck. Thanks -J
  58. Chemistry

    What is the pressure exerted by a .500 mol sample of nitrogen in a 10.0L container at 20C?
  59. Chemistry

    What is the molarity of a solution that results when 3.64 g KCl is dissolved in water and diluted to exactly 200.0 mL?
  60. Chemistry

    Calculate (triangle H) for the complete combustion of 10.0g benzen. Equation? and could someone give me the answer?
  61. chemistry

    How many mL of 5.00% (w/v) solution are needed to make 100mL of physiologic saline (0.90%(w/v) sodium chloride)?
  62. chemistry

    In a household radiator, 1000 g of steam at 100 C condenses. How much heat is released?
  63. Chemistry

    What would happen to the color of a dilute solution containing FeCL4 if you added concentrated HCl?
  64. chemistry

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

    Calculate the mass in grams present in 0.95 mole of sodium hydrogen trioxocarbonate(iv)
  66. CHEMISTRY

    What substances will increase the molar solubility of nickel(II) phosphate in a saturated solution?
  67. Chemistry

    How does salt hydrolysis work between sodium hydroxide and lactic acid in a titration?
  68. Chemistry

    How many moles of sodium ions are present in a 50.0 g sample of NaCl? Do I use avagadros number?
  69. chemistry

    Why doesn't the hydrogen produced in the Lithium/water reaction catch fire?
  70. Chemistry

    CHemical equation showing how NH3 behaves as a base when dissolved in water
  71. chemistry

    how many liters of ammonia at STP are required to produce 4.65 grams of hydrogen fluoride?
  72. Chemistry

    Zinc - .5 grams HCl- .2 moles Find the Mass of ZnCl2 [How would you solve this?]
  73. chemistry

    Help !determine the emprical formula of a compound w which had 34.2 of iron and 65.8 of chlorine cl35.5 fe56
  74. chemistry

    One more that should be easy but im stuck. What is the molarity of a 15% by weight solution of HCL (Density = 1.18g/ml)?
  75. CHEMISTRY

    What are the ka and kb reactions of NaHSO3 ? i know you got to ignore Na because is a strong base but i don't know how to get the actual ka and kb ! pleasee help me!!!!!!!!!!!!
  76. chemistry

    How many moles of sulfate ions are in 100 ml of a solution of .002 M Fe2(SO4)3?
  77. Chemistry

    Calculate the final temperature of 244 of water initially at 35 upon absorption of 20 of heat
  78. Chemistry

    Write the formula for iron (III) sulfate. My answer is Fe2(SO4)3
  79. chemistry

    how many sublevels exist in the fourth principle energy level? a) 2 b) 4 c) 16 d) an infinite number
  80. chemistry

    if an antacid tablet was dissolved in water would the solution become acid, base or neutral? why?
  81. Chemistry

    If 5.00L of argon gas is at 0.460 atm and -123C what is the volume at STP I think it's b
  82. Chemistry

    7. Suppose 45.0 mL of 0.250 M HNO3 was mixed with 35.0 mL 0.600 M Ba(OH)2. Calculate the pH of the final solution.
  83. CHEMISTRY

    What are the ka and kb reactions of NaHSO3 ? i know you got to ignore Na because is a strong base but i don't know how to get the actual ka and kb ! pleasee help me!!!!!!!!!!!!
  84. chemistry

    Complete and balance this reaction: sulfuric acid reacts with barium chloride
  85. chemistry

    A radioisotope has a neutron/proton ratio which is too low. Which of the following processes will not occur for such a nucleus?
  86. chemistry

    A sample of ammonia (Kb = 1.8 * 10-5) is titrated with 0.1 M H2SO4. At the equivalence point, the pH is approximately Isn't it should be 5 right i believe.
  87. Chemistry

    A solution of 100g of water contains 23 g of table salt. At what temperature will it begin to freeze?
  88. Chemistry

    Why is caffeine susceptible to analysis by reversed-phase HPLC and why couldn't it be performed by GC?
  89. chemistry

    Analyze and explain the buffer system in buffered aspirin (carboxylic acid).
  90. AP Chemistry

    what is the procedure and materials needed to make a 0.10m solution of Potassium Hydroxide?
  91. chemistry

    at what temperature will a gas sample occupy 6.6L if it originally occupies 14.1L at 14.4 degrees celcius
  92. AP Chemistry

    what are the procedures and materials needed to make a 0.10m solution of Silver(I) Chloride?
  93. Chemistry

    a.) 2KClO3 (s)-------> 2KCl(s) + 3O2(g) b.) 4NH3(g) +6NO(g) ---------> 5N2 (g) +6H2O(g) c.) 4K(s) + O2(g) ------> 2K2O(s)
  94. AP Chemistry

    what si the procedure to make a 0.10m solution of Potassium Hydroxide during a class lab?
  95. Chemistry

    The total volume of mixture of 2grams of helium and 7 grams of nitrogen at s.t.p is 1)22.4 2)11.2 3)16.8 4)5.6 in liters help me please.
  96. Chemistry

    Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^-5.
  97. Chemistry

    Calculate ph value of soft drink having hydrogen ion concentration equal to 3x10^-5.
  98. chemistry

    what would be the volume of 0.05 mole of carbon tetra chloride gas ccl4 ar rtp
  99. chemistry

    Dose the law of conservation work when doing an expirement with vinegar and baking soda.
  100. chemistry

    How many moles of hydrogen would be obtained if 2.7g of aluminium reacts with excess hydrochloric acid?
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