CHEMISTRY (WEBWORK)

59,669 results, page 84

  1. Chemistry

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

    Determine if the following reaction is spontaneous under standard conditions. Zn(s) + 4 CN¡V(aq) + Ag2CrO4(s) „³ Zn(CN)42¡V(aq) + 2 Ag(s) + CrO42¡V(aq)
  3. chemistry

    In industrial plants, what specific type of oil is used as heating medium?
  4. 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 ?
  5. Chemistry

    What voltage would be measured in a 1.00 x10-3M acetic acid solution (pH=3.88)? Assume aH+= [H+].
  6. 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]
  7. chemistry

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

    What is the density of a sample of 65.0mL of automobile oil having a mass of 59.82g
  9. chemistry

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

    Determine the density of chlorine gas at 22C and 1.00 atm pressure.
  11. Chemistry

    Predict the Order of increasing bond length for (i) H2(g) (ii) I2(g) (iii) F2(g) I don't know how I should know
  12. Chemistry

    how would you prepare 500 ml of .2M solution starting with solid NaH2PO4*H20?
  13. chemistry

    S2Cl2, AlCl3, SiCl4, PCl3 which one is least polar give reason
  14. chemistry

    What is the value of [HCO3- ]/PCO2 for someone with mild acidosis, with a blood pH of 7.30? 1. 0.038 2. 0.38 3. 0.030 4. 0.30 5. 3.0
  15. Chemistry

    What mass KCl is needed to precipitate AgCl from 15.0 mL of .200 M AgNO3
  16. CHEMISTRY

    How much of h2so4 would be required to make 2.5dm3 of a 1/10 normal solution? 1)12.3g 2)24.5g 3)49.0g d)122.5g
  17. chemistry

    how much faster does krypton diffuse than bromine under the same conditions of temperature and pressure?
  18. Chemistry

    What are all the possible lewis structures for SCN-? Including the formal charges to all atoms.
  19. Chemistry

    What are all the possible lewis structures for SCN-? Including the formal charges to all atoms.
  20. chemistry

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

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

    Radon-222 undergoes alpha decay.what is the nuclear equation
  23. Chemistry

    What is the temperature change in celsius when 29.5L of water absorbs 2.3 kwh of heat?
  24. Chemistry

    IS glass etching by Hydrofluoric acid a physical or chemical change? Thanks you
  25. chemistry

    How many grams of nacl are required to completely neutralize 100 ml of 1M h2so4?
  26. CHEMiSTRY

    what is the relationship between the pressure of a gas and the absolute temperature when the volume is kept constant ?
  27. chemistry

    What quantity of CaCO3 (limestone) on heating will give 112g of CaO?
  28. Chemistry

    How would I calculate the mass of 20ml of a 3% hydrogen peroxide from a 30% H2O2 solution?
  29. chemistry

    How many atoms of tin are necessary to react completely with 7.42 x 10(24th)g of HF. Sn(s) + 2HF(g) = SnF2(S) + H2 (g)
  30. Chemistry

    Does a catalyst affect a reversible equation like the kind in my earlier post?
  31. 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
  32. chemistry

    What is the wavelength of radiation that has a frequency of 6.912 × 10^14 s−1? and does the s-1 make a difference? Thank you!
  33. Chemistry

    How energy is needed to vaporize 100 g of ethanol from its boiling point?
  34. Chemistry

    which isotope can be used as a tracer to study the age of organic material ? 1 C-12 2 C-14 3 Tc-99 4 U-238
  35. Chemistry

    advantages and disadvantages of municipal waste instead fuel Cannot come up with an answer for this one having trouble please someone help!
  36. chemistry

    What is the maximum amount (in grams) of CO2 that can be obtained from 454g of Fe2O3?
  37. organic chemistry

    calculate the mass in grams of 10.0ml if mercury (Hg) is the density Hg 13.6g/ml
  38. 9th grade chemistry

    fill in the name or formula for the oxyanions of chlorine the only one i need help with is the name for [ClO4]-
  39. chemistry

    Calculate the pressure in the flask in torr, atmosphere, and pascals if ha = 114 mm.
  40. Chemistry

    The following electron configurations correspond to the ground states of certain elements. Name each element. a) [Ar]3d^10 4s^2 4p^4 b) [Ne]3s^2 3p^3 c) [Ar]3d^2 4s^2 d) [Kr]4d^1 5s^2 e) [Xe]4f^13 6s^2
  41. chemistry

    what is the molar change in enthalpy when 100 g of ice is heated from -18.2C to -7.2C?(C=37.4 J/K*mol)
  42. chemistry

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

    certain electromagnetic wavelenght radiation has frequency of 98hz .what will be its wave lenght?
  44. Chemistry

    Determine the freezing point depression of H20 in 1.50 m solution of C12H22011?
  45. chemistry

    How aluminium is extracted from its BAUXITE ORE which contains Fe203 and Sio2 as impurities?
  46. Chemistry

    In recrystalization of acetanilide if your percentage yield is greater than 100% how would this occur?
  47. Chemistry

    Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
  48. Chemistry 1115

    How do you calculate the molarities of HC2H3O2 and NaC2H3O2 in a buffer solution?
  49. Chemistry

    calculate the frequency of an xray having a wavelength of 3.5*10to the negative seven m. (meters).
  50. Chemistry

    Which symbol correctly represents an element (D) whose atoms contain 15 protons and 20 neutrons? A. 20/15 D B. 15/20 D C. 35/15 D D. 15/35 D C?
  51. chemistry

    what is the complete ionic equation for the double displacement of CuNO3(aq)+K2S(aq)
  52. Chemistry

    When the pH of a buffer is equal to its pKa, what is the amount of dissociation that has occurred? 1 % 25 % 50 % 100 %
  53. Chemistry

    What maszid hydrochloric acid is needed to decompose 50g of limestone?
  54. chemistry

    how much E is used to heat 500g of iron from 22c to 55c? Cfe=0.451 Jg-1C-1.
  55. chemistry

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

    *.How many grams of KCl would you need to add to 2 liters of water to make a .50 M solution?
  57. Chemistry

    Calculate the pH at 298K of solutions having the following ion concentrations? A. [H+]=1.0 x 10^-4M B. [H+]=5.8 X 10^-11M for A do you subtract 1.0 X 10^-14 from H+]=1.0 x 10^-4M
  58. Chemistry

    Write the formula for a complex formed between Zn2 and OH–, with a coordination number of 4.
  59. Chemistry

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

    1. Which of the following bonds is the strongest? a. F-F b. F-Cl c. F-Br d. F-I I think it's A because of the same atomic radius. Is that correct? Am I on the right track?
  61. chemistry

    how do you calculate grams of KCL in 3 litres of a 5% solution? (scientific notation)
  62. Chemistry

    If 118 g of ice at 0.0°C is added to 1.55 L of water at 88°C, what is the final temperature of the mixture?
  63. chemistry

    Explain the observed temperature change upon mixing ethanol and cyclohexane.
  64. chemistry

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

    How many electrons involved in the reduction of one mole of Al2o3 to aluminium metal
  66. chemistry

    How many atoms of hydrogen are found in 2.48 mol of propane, C3H8? Someone can explain to me. Thanks
  67. chemistry

    Balance the following equations. Show all work. MnO4- + Zn -> Mn2+ + Zn2+
  68. Chemistry

    Are the molecular and imperical formula of lauryl alcohol the same? C12 H26 O?
  69. chemistry

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

    Why is it important to use liquids with relatively lower boiling points when using the Dumas method?
  71. chemistry

    Calculate the equilibrium constant for 2CH3OH(l)+3O2(g)->2CO2(g)+4H2O(l)
  72. Chemistry

    What is the temperature (in kelvins) at which 0.0260 mol occupies 1.00 L at 0.563 atm?
  73. Chemistry

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

    explain how you would convert from number of atoms of a specific element to its mass
  75. Chemistry

    What's the balanced chemical equation of cleaning up oil, whether it be a spill, pipe etc.
  76. chemistry

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

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

    whatmass of (NH4)3SO4 is required to prepare 500cm3 of m/4 solution
  79. Chemistry

    If 6.0 g of Oxygen (O2) reacts with 12.0 g of hydrogen (H2) to give 5.0 g of dihydrogen monoxide. What's the % yield?
  80. chemistry

    what is the volume of 3.85x10^24 molecules of AMmmonium Bromide? please explain I'm confused
  81. Chemistry

    Write equatios for the ionization of the following acids. (a)HF , (b)H2SO3 , (c)CH3COOH , (d)HNO3.
  82. Chemistry

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

    How many kilojoules are needed to vaporize 3.00 liter of ethanol at 78 degree celcieus?
  84. Chemistry

    What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) ¨ CO2(g) + 2 H2O(g)
  85. chemistry

    what are the appropriate masses of the subatomic particles expressed in atomic mass unit
  86. Chemistry

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

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

    Whats the name for HI(aq)? I thought it was Hydrogen Iodide, but that's incorrect, does the aq change the name?
  89. Chemistry

    If your body develops a charge of -18 (microcoulombs), how many excess electrons has it acquired?
  90. Chemistry

    How many numbers of oxygen molecules are present in 3 liters of CO2 at STP?
  91. ap chemistry

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

    If the initial volume of the is 1.2 , what total amount of (in moles) is formed in the first 50 of reaction
  93. Chemistry

    Calculate the H+ ion concentration if 0.20M NH3 solution is 2.5% ionized.
  94. Chemistry

    Predict the physical properties and relative reactivity of Rb, Cs, and Fr (From the periodic table)
  95. chemistry

    For each of the following explain how you would prepare 1.0 L of a solution that is 0.10 M in K+. Repeat for concentrations of 1.0 × 102 ppm K+ and 1.0% w/v K+.
  96. Chemistry 3A

    what is the maximum number of electrons that may occupy the second electron energy level?
  97. chemistry

    If you look at the side of a quarter, you can see layers of different metals. Is a coin a solid solution?
  98. 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?
  99. Chemistry 3A

    what is the maximum number of electrons that may occupy the second electron energy level?
  100. Chemistry

    What is the pH of a solution in which 25 mL of .10 M NaOH is added to 15 mL of .10 M HCl? I have calculated the amount of moles of each, but I'm not really sure where to go from there. Thanks!
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