CHEMISTRY (WEBWORK)

59,293 results, page 85

  1. chemistry

    write equations for the reactions of NaOH(aq) with solutions containing Al^3+ Cu^2+(aq),Pb^2+(aq) and Fe^3+(aq) ions respectively
  2. chemistry

    If a soda can is 11.8 cm tall, how many would it take to make a stack to reach the moon?
  3. ap chemistry

    2.70 g/cm3 to pounds per cubic foot could you please show me the steps
  4. College Chemistry

    When you bake cake batter it solidifies. Is this a physical or chemical change?
  5. ap chemistry

    how to alculate the molar amount of a compound used to neutralize a solution? pleassssssssss help!
  6. Chemistry (11th)

    Write the reaction for combustion of CH4 include the heat term.
  7. chemistry

    How many grams of na3po4 will be needed to produce 425ml of a solution that has a concentration of na+ ions of 1.30 M?
  8. Chemistry

    I'm completely confused on how to solve this problem. Convert 125 hp-hr/long ton to kW-s/kg.
  9. Chemistry

    I'm completely confused on how to solve this problem. Convert 125 hp-hr/long ton to kW-s/kg.
  10. chemistry

    What is composed of atoms in fixed proportions? A. mixtures B. compounds C. electrons D. elements
  11. chemistry

    What is the concentration of each type of ion on a 0.010 molar solution of Lithium sulfate (aq)?
  12. Chemistry

    Calculate the amount of heat required to raise the temperature of a 54 g sample of water from 5°C to 20.°C.
  13. chemistry

    what happens when sodium nitrate and copper hydroxide are heated in a boiling water?
  14. Chemistry

    How does a compound's properties compare to those of its component elements? Provide an example. I don't get this q.
  15. chemistry

    A sugar crystal contains approximately 1.7×10^17 sucrose (C12H22O11) molecules What is its mass in mg?
  16. Chemistry

    Find the volume in liters of 0.452 M manganese(II) sulfate that contains 54.5 g of solute?
  17. chemistry

    What mass of carbon dioxide is produced from the complete combustion of 8.20×10−3 g of methane?
  18. chemistry

    A sugar crystal contains approximately 1.7×10^17 sucrose (C12H22O11) molecules What is its mass in mg?
  19. chemistry

    what is the minimum number of electrons that would be expected to be in the valence shell of As in AsCl
  20. Chemistry

    Why is the expansion of air into a region of low pressure an endothermic proccess?
  21. chemistry

    What mass of protons would be required to just neutralize the charge of 2.7 g of electrons?
  22. chemistry

    How many {\rm NO}_{2} molecules would form as products if the reaction had a percent yield of 75\%?
  23. Chemistry

    what is the lewis structure with lowest formal charges and label the charge of each atom in NO
  24. chemistry

    Calculate the amount of heat required to raise the temperature of a 25 sample of water from 7 to 25.
  25. Chemistry

    Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!
  26. Chemistry

    Find the limiting reagent. 2 NH4 (g) + 4 CuO (s) ==> N2(g) + 4 Cu(s) + 4H2O (g) Please explain, thank you!
  27. Chemistry

    What mass of protons would be required to just neutralize the charge of 1.5 g of electrons?
  28. Chemistry 2

    Which solution will have the lowest pH ? A. .10 M HCN B. .10 M HNO3 C. .10 M NaCL D. .10 M H2CO3 E. .10 M NaOH
  29. chemistry

    calculate the velocities of electrons with de Broglie wavelengths of 1.0x10^2nm and 1.0nm
  30. Chemistry

    Calculate the molality of CsCl in a 6% by mass aqueous solution. Answer in units of m.
  31. Chemistry

    If 100.0 J are added to 20.0 grams of water at 30.0 degrees Celsius. What will be the final temperature?
  32. Chemistry

    If 100.0 J are added to 20.0 grams of water at 30.0 degrees Celsius. What will be the final temperature?
  33. Chemistry

    What volume of a 0.600 M solution of AgClO4 is needed to produce 160g of AgCr04?
  34. chemistry

    What is the net ionic equation for chlorine ion and silver nitrate reagent?
  35. chemistry

    what is the net ionic equation for Na3PO4 + ZnSO4=Zn3(PO4)2+ Na2SO4
  36. chemistry

    In comparison ot milk sugar, what is the approximate molecular weight range of proteins?
  37. Chemistry

    consider a neutral atom with 69 protons and 80 neutrons what is the atomic number of this element
  38. Chemistry

    In respect to covalent bonding, what does it mean if there's an unshared or lone pair of electrons?
  39. chemistry

    what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)
  40. chemistry

    what would be the mass of an Au sample whose volume is 2.85mL?( the density of gold is 19.3g/mL)
  41. Chemistry

    What is the net ionic equation for the precipitation of nickel sulfide from aqueous solution.
  42. chemistry

    which is a chemical property? volume, mass, melting point, flammability or temperature?
  43. chemistry

    calculate the volume of .1M HCl that is required to react with 50 mL of .1M ammonia to form a mixture that has pH 9
  44. AP Chemistry

    how do you balance a redox equation like: Bi(NO3)3 + Al + NaOH = Bi + NH3 + NaAlO2 ??
  45. 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?
  46. chemistry

    what is the formula of the product form when CH3NH2 reacts eith hydrogen ion?
  47. Chemistry

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

    how many moles of ions are released when 1.6 mol of ammonium phosphate is dissolved in water?
  49. Chemistry

    Name some advantages of using acetaminophen instead of aspirin as an analgesic
  50. Chemistry

    Calculate the molality of CsCl in a 18% by mass aqueous solution. Answer in units of m.
  51. chemistry

    Calculate the mass of KI in grams required to prepare 7.00 multiplied by 102 mL of a 2.60 M solution
  52. college organic chemistry

    Give the product of the substitution reactions. (CH3)2CHOSO3CH3 -> ?
  53. chemistry

    Fe(S)+ 2 HCl(ag) --> FeCL2(ag)+ H2(g What mass of H2 (g) is produced from the reaction of 5.2 Fe(s) with excess hydrochloric acid?
  54. Chemistry

    3.57×10−2 mol Ba Express your answer using three significant figures
  55. Chemistry

    What will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?
  56. Chemistry

    What will be the final temperature if 2000g of copper at 95 degrees loses 10 kcal of heat?
  57. Chemistry

    How many milliliters of 6.0 M HCl would be needed if 3.000 g of K2CO3 were used in an experiment?
  58. Chemistry

    How many grams of KCl would be formed in the reaction of 3.000 g of K2CO3 and HCl?
  59. chemistry

    If the specific heat of a metal is 0.150 cal/g-deg, what is its approximate weight?
  60. chemistry

    Find the emf for the cell Cr(s) |Cr3+(aq, 0.37 M) || Pb2+(aq, 0.0095 M) | Pb(s). Answer in units of V I don't know what to do
  61. chemistry

    Find the emf for the cell Cr(s) |Cr3+(aq, 0.37 M) || Pb2+(aq, 0.0095 M) | Pb(s). Answer in units of V I don't know what to do
  62. Chemistry

    Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
  63. Chemistry

    Calculate the number of molecules in 3.1466x10^1 grams of sulfur dioxide, SO2
  64. Chemistry

    5. The elements are related by properties in groups.- F? 7. In Earth's environment, hydrogen is a metal.- T? Thanks -MC
  65. Chemistry

    What is the dominant intermolecular forces for C2H5OC2H5 (diethyl ether)? Is it dispersion and polar?
  66. chemistry

    calculate the work done when 50.0g of tin dissolves in excess acid at 1.00 atm and 25 degrees c.
  67. Chemistry

    Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?
  68. chemistry

    Calculate the [H3O+] of the following polyprotic acid solution: 0.145 M H3C6H5O3?
  69. chemistry

    How many grams of calcium nitrate, Ca(NO3)2, are needed to make 100 mL of a .5 M solution?
  70. chemistry

    a 25.0 sample of nitrogen has a volume of 50.0L and a pressure of 630. mmHg. what is the temperature of the gas?
  71. Chemistry

    Concentration of OH- left in a solution made by mixing 16.0 g of NaOH and 80.0 mL of 0.170M HNO3?
  72. Chemistry

    The Ka values of H2CO3 are shown below. Ka1 4.6 10-7 Ka2 4.4 10-11 What is the pH of a 0.17 M solution of Na2CO3?
  73. chemistry

    How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?
  74. chemistry

    How many grams of potassium fluoride are needed to make 250 mL of a 0.31 M solution in water?
  75. lab questions (chemistry)

    why must not the condensed water drip into the flask?
  76. Chemistry

    Can anyone tell me why the answer that I got here is not correct? Pb(s) + AgNO3(aq) yields Ag(s) + PbNO3(s)
  77. Chemistry

    How many electrons in an atom can have each of the following quantum number or sublevel designations? 1. n = 4, l = 3
  78. chemistry

    How many moles of electron are transferred per mole of this reaction? 6Li + N2-> @Li3N
  79. chemistry

    What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)
  80. chemistry

    What is the volume of 3.5 moles of oxygen gas (O2) at standard temperature and pressure (STP)? 6.4 L 22.4 L 32.0 L 78.4 L
  81. chemistry

    if 3.ooml of cyclohexanol were used in the dehydration reaction, what is the theoretical yield of cyclohexene?
  82. Chemistry

    Write the equilibrium constant expression for the reaction: 2NO +2H2 =N2+2H2O Kc=?
  83. chemistry

    how many moles of butane gas c4h10 react to produce 3.50moles of water?
  84. Chemistry

    The only strongly electropositive metal that will not form a saline hydride is what element?
  85. Chemistry

    What is the chemical cause of the greens and red colors of aurora borealis (the northern lights)?
  86. chemistry

    21.00 mL of 0.200 M HBr is titrated with 0.351 M NaOH. What is the pH after the addition of 6.56 mL of the base ?
  87. Chemistry

    What is the mass of 1.665 x 10 to the 22nd formula units of calcium acetate,Ca(C2H3O2)2?
  88. college chemistry

    What is the pH of the solution obtained by diluting 500 mL of 0.0200 M NH3 (aq) to 1.000 L ?
  89. Chemistry

    What is the structure of SN? I thought .:S=N:: or ::S=N:. but both were deemed wrong by the homework software we have... help!
  90. Chemistry

    How many liters of CO2 would be produced if 32 grams of CH4 are combined with oxygen?
  91. chemistry

    Which halogen can form only one oxidation state other than zero?
  92. Chemistry

    Explain how shielding contributes to the atomic radius trend within a group.
  93. Chemistry

    calculate the number of formula units of 0.0067 g of lithium carbonate, Li2CO3?
  94. Chemistry

    What is the molecular ratio of the following equation? HNO3 + KOH = H2O + KNO3
  95. chemistry

    How many grams of H2(g)can theoretically be produced from a 5-g sample of magnesium metal and excess HC1(aq)?
  96. Chemistry 111

    Whatis the gas produced when you add NaHCO3 to methyl salicylate?
  97. chemistry

    Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.
  98. Memorial university,chemistry

    What is the total number of sigma and pi bonds in the molecule {CH}_3{NCO}?
  99. Chemistry

    You mix HCl with Na2CO3; the result is not exactly a precipitation, but it is related. Explain.
  100. Chemistry 110

    How many grams of Au2S can be obtained from 1017 mol of Au? The answer is 249. How did they get that?
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