CHEMISTRY (WEBWORK)

59,669 results, page 83

  1. Chemistry

    Dear DrBob222 !!! Would you please help me answers the question that I posted. I really don't understand and need help! Please, Thanks
  2. chemistry

    blance this equestion with partial balincing method:- Zn+HNo3(very dil)
  3. chemistry

    how many mL or .0252M HNO3 are required to neutralize 25.00mL of .0148M of Sr(OH)2? and how did you get the answer!!!
  4. chemistry

    How would you convert 77 degrees F to kelvins? Can you explain it please because I don't really understand how to get it to Fahrenheit.
  5. Chemistry

    Using the "octet rule" write the Lewis formulas for NF3 and NO3-.
  6. chemistry

    Potassium iodide (KI) is used to treat iodine deficiencies. What is the %(w/v) of a 55 mL solution containing 1.3 g of KI? 0.024
  7. Chemistry

    3-bromo-3-ethylpentene is treat with HBr what main product does it yield?
  8. chemistry

    Explain how to make a 1.5M solution of copper (II) sulfate with a volume of 250 mL.
  9. Chemistry

    When 3.2 moles of Al react with excess HNO3 at STP, How many liters of H2 are formed
  10. chemistry

    what volume does 2.5 moles of carbon monoxide occupy at 50.5 kPa pressure and 20.0 C?
  11. chemistry

    In the reaction below: Increasing the concentration of Cl2 will _____ at equilibrium. HAVE NO EFFECT
  12. chemistry

    Write the balanced chemical equation for the dissolution of magnesium sulphate
  13. chemistry

    The nutritional label on the package indicates that a cookie contains 150 Calories. Express this value in kJ and in J
  14. Chemistry

    All the following are necessary parts of a neutralization reaction except A) an acid B) an indicator C) water D) a salt.
  15. Chemistry

    What mass of HNO3 is present in 248.6 mL of a nitric acid solution having a pH = 5.04?
  16. chemistry

    How do you calculate the weight of the following compounds? A)H2O2 B)C6H8O6 C)K2Cr2O7 D)C56H88O2
  17. chemistry

    So if there is Ag2CrO4, the metal wire, in a SCE and Hg2Cl2 which will be the anode and cathode?
  18. chemistry

    2K(s) . Cl2(g) KL 2KCl(s) Write the six possible mole ratios for this equation im so confused
  19. chemistry

    CH4 + 2 O2 = CO2 + H2O Carbon is being oxidized Oxygen is being reduced
  20. Chemistry

    How do I balance this equation and what is the answer? C3H9N+O2-->CO2+H2O+NO2
  21. chemistry 1-2

    How many milliliters of 0.1350 M HCl(aq) will react with 0.066 mol of KMnO4(aq)?
  22. chemistry

    how to find a structure factor of a face centerd cubic lattice
  23. chemistry

    What is the density of sulfur dioxide gas at 25 degrees celsius and 754 mm Hg?
  24. chemistry

    4KCl + 4HNO3 + O2 ==> 4KNO3 + 2Cl2 + 2H2O what kind of reaction is this?
  25. Chemistry

    Calculate the maximun=m mass of ethanol that can be made from 5.6 tonnes of ethen
  26. chemistry

    Calculate pH for strong base solution: 15.0 mL of 1.20×10^−2 M Ca(OH)2 diluted to 460.0 mL
  27. Chemistry

    (2.50mL)(0.10M) / 75.00mL = 0.003333 Im not sure how many sig figs to use. Would it 3.33e-3?
  28. chemistry

    hund's rule tells us that element 116 will have what paired electrons?
  29. Chemistry

    What is the name for the following coordination compound or ion? Na3[Cr (NH3) NO2 Cl3]
  30. chemistry

    explain how you would develop a scheme to separate and identify ag, pb, fe,and al in a solution that might contain all four as ions
  31. Chemistry

    What is meant by 0.2mol (12g) of glacial acetic acid how can we make ?
  32. Chemistry

    What are some examples of chemical and physical changes in heat taking place around you for one day?
  33. Chemistry

    Express each of the following with three significant figures. 0.002537 12345000 0.07966 620.2
  34. chemistry

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

    calculate the heat liberated when 15.0 g glucoseis metabolized to CO2 and H2O
  36. chemistry

    What is (a)PH(b) POH of a solution wholes hydrogen ion consentration is 5.00x10-4?
  37. chemistry

    Mg(OH)2 + 2HCl = MgCl2 + 2H2O if 33.5g of Mg(OH)2 react, what mass of H2O could be produced
  38. chemistry

    Upon heating 125g MgSO4 • 7 H2O: a) how many grams of water can be obtained?
  39. Chemistry

    What volume of 3.0M sodium hydroxide will be needed to neutralize 2.0 L of 1.0M hydrochloric acid?
  40. chemistry

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

    What is the molarity of 250 mL of a solution that contains 12.5 g of dissolved zinc bromide, ZnBr2?
  42. chemistry

    Describe how would accurately prepare one litre of 150 ppm using copper
  43. Chemistry

    What is the balanced equation for the reaction of acetylsalicylic acid and sodium hydroxide?
  44. Chemistry

    How many kilojoules of heat are absorbed when 1.2 L of water is heated from 24oC to 86oC?
  45. Chemistry

    Calculate the degree of dissociation and oh conc in 0.1m (nh4)3po4 having alpha 50%
  46. chemistry

    what should I include in my discussion when writing up my heating substances lab experiment?
  47. chemistry

    Calculate a value for the solubility of (NH4)2C2O4H2O in g/100 cm3 at 298 K
  48. chemistry

    A catalytic converter combines 2.55 g CO with excess O2.What mass of CO2 forms?
  49. chemistry

    which pair of atom will combine chemically to give an ionic compound? a)H and U b)O and S C)F and CA d)NA and CL
  50. chemistry

    Which of the following bases could you write an equilibrium expression for? A. Ba(OH)2 B. KOH C. NaOH D. NH3
  51. chemistry

    Which is most acidic in its aqueous solution? a)FeCl3 b)AlCl3 c)NiCl3 d)BeCl2
  52. chemistry

    Fill in the missing value for V. P=1.2 atm, n-5.00 and T= 300.15 K....how do I set up the PV=nRT or do I solve in a different way?
  53. chemistry

    calculate the heat needed at 0c each of the following joules to freeze 275gof water
  54. 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?
  55. Chemistry honors

    You have 2.657 x 10^2 mL of oxygen gas (O2) at 7.02 x 10^2 mm of Hg and 46 oC. What is the mass of the sample in milligrams?
  56. chemistry

    a test liquid has a density of 1.1g/mL. when you pour some of it into a cup of water, what will happen?
  57. Chemistry

    Two hydrides A and B of an element X contain 17.76% and 12.58% by mass of hydrogen. Identify A and B and comment on their structures.
  58. CHEMISTRY HELP !!!!

    Complete the following fission reaction 1/0 n + 235/92 U ---> 236/92 Te + _____ +2 (1/2)n a) 97/40 Zr b) 99/40 Zr c) 99/38 Sr d) 95/42 Mo e) 96/41 Y Answer is A or B not sure
  59. science chemistry

    balance Redox :- CuS + SO4²- = CuO+SO2
  60. Chemistry

    energy required to raise the temp of H2O from -15C to 125c
  61. chemistry

    How many mL of 0.6 M H2SO4 solution are needed to react completely with 23.62 g of Fe2O3 in the following reaction?
  62. chemistry

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

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

    balance Redox :- CuS + SO4²- = CuO+SO2
  65. Chemistry

    At constant pressure, which of these systems do work on the surroundings? Check all that apply. A(s) + 2B(g) ---> C(g) 2A(g) + B(g) ---> 4C(g) A(g) + 2B(g) ---> 2C(g) A(s) + B(s) ---> C(g)
  66. ap chemistry

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

    You mix 1.00 L of 2.00 M BaCl2 with 1.00 L of 2.00 M AgNO3. What compounds remain in solution, and what are their concentrations?
  68. Chemistry

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

    How many grams of water are formed when 250 mL of 2.0 M Mg(OH)2 are neutralized by a solution of HCL ?
  70. Chemistry

    1.Name the raw materials used in the manufacture of Sodium Carbonate by Solvay process.
  71. chemistry

    what type of intermolecular bonding would be expected between molecules of carbon monoxide and why?
  72. Chemistry

    KMnO4 + H2SO4 + H2S will give K2SO4 + MnSo4 + H20 + S
  73. chemistry

    when 25.0 of lithium iodide completely dissolves in water how much heat is evolved
  74. Chemistry

    What volume of ammonia gas at s.t.p is required to neutralise 40 cm of 2 M sulpheric acid?
  75. chemistry

    Calculate the "exact" alkalinity of a water that contains 0.6580 mg/L of bicarbonate, as the ion, at a pH of 5.66.
  76. Chemistry

    Is there any periodicity in the maximumm oxidation number for elements 11 through 17? If so, explain your answer.
  77. chemistry

    what is the wave lenghth of the alpha particle Po which has velocity of 15x10 to the power 6 ms-1
  78. chemistry

    If you have 2 moles of glucose in 8 liters of solution, what is the molarfity of this sol;ution?
  79. chemistry

    solve under rate of reaction: 1)Mno4^- + Fe2^+=Mn2^+ + Fe3^+
  80. chemistry

    P4 + HNO3 = H3PO4 + NO2 + H20 by partial method balancing
  81. chemistry

    solve under rate of reaction: 1)Mno4^- + Fe2^+=Mn2^+ + Fe3^+
  82. chemistry

    solve under rate of reaction: 1)Mno4^- + Fe2^+=Mn2^+ + Fe3^+
  83. chemistry

    Can metals be fused without heat or pressure, and if it is possible would that be a form of cold fusion?
  84. chemistry

    how much NAOH must be added to 500ml acetic acid 0.5Mol to give ph 0.5
  85. chemistry

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

    How much 0.200 M KOH is required to completely neutralize 25.0 mL of 0.150 M HClO4?
  87. Chemistry

    How many calories would be required to raise the temperature of 25.0 g of lead by 55.0 degree Celcius?
  88. Chemistry

    Calculate the equivalent mass of each of the following acids. a) HC2H3O2 b) KHCO3 c) H2SO3
  89. chemistry

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

    WHEN CAP OF SOFT DRINK IS REMOVED THEN ITS MASS FIRST INCREASES AND THEN DECREASES WHY?
  91. AP CHEMISTRY

    Calculate the equivalent mass of each of the following acids. a) HC2H3O2 b) KHCO3 c) H2SO3
  92. CHEMISTRY

    WHEN CAP OF SOFT DRINK IS REMOVED THEN ITS MASS FIRST INCREASES AND THEN DECREASES
  93. Chemistry

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

    if an excess of nitrogen is reacted with 3.41 g of hydrogen, how many grams of ammonia can be produced?
  95. chemistry

    How many grams of water should be added to 25.0 g of NaCl to produce a 0.450 m solution?
  96. Chemistry

    3.54*10^7 g of TiCl4(g) are reacted completely. If 7.91*10^6 g of Ti(s) is actually obtained, calculate the percent yield.
  97. Chemistry

    4 NH3 + 5 O2 --> 4 NO + 6 H2O. How many grams of O2 are required to product 90 g of NO? Please assist in solving.
  98. Chemistry

    Which is a conjugate pair in the following equilibrium? H2C2O4(aq) + HPO4(aq) 2- HC2O4(aq)- + H2PO4(aq)-
  99. Chemistry

    please say if molecule is polar or nonpolar: H2 HBr BrCl CS2 H2S
  100. chemistry

    what is the density of a piece of metal that has a mass of 18g and volume of 2mL
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