chemistry! URGENT

61,637 results, page 87

  1. CHEMISTRY HELP! D;

    1._____Mg + _____N2 ---> _____Mg3N2 2. _____KNO3(s) ---> _____KNO2(s) + _____O2(g)
  2. Chemistry help pls

    DEFINE REDOX REACTION WIT EXANPLE
  3. Chemistry

    how do i write the complete electron configuration for Ga3+ and Mg2+????????????
  4. Chemistry

    Balance this equation: Cu + H+(aq) + NO3-(aq) -- Cu2+(aq) + NO2 + H2O
  5. Chemistry

    Calculate the [H+] in a solution containing 1.00 M hydroflouris acid (Ka=7.2 x 10^-4) and .50 M sodium fluoride
  6. Chemistry

    The amount of k2Cr2O7 required to prepare 100 ml of its 0.05 N solution
  7. chemistry

    a piece of silver cut in half,density stays the same.Why?
  8. chemistry

    What functional group(s) must be present in a monomer of a condensation reaction?
  9. chemistry

    7.Calculate the volume of a substance that has a density of 5.47 g/mL and a mass of 8.065 g.
  10. chemistry

    At what temperature (in degrees C) does acetone have Pvap= 102 mmHg?
  11. Chemistry

    If 10.0g of Pb at 25.0oC absorbs 1.00kJ of heat, what is it's final temperature?
  12. Chemistry ? help!

    How do I perform the following conversions of pressure units: 168 torr = What?
  13. Chemistry

    A certain shade of blue had a frequency of 1.01*10^-4 Hz. What is the energy of exactly one photon of this light?
  14. chemistry please help

    How many core electrons are there in a ground state phosphorus atom?
  15. chemistry

    What would be pH of a 0.01 M solution of a very expensive weak base, unobtainamine, whose pKb is 3.8? 1. 2.9 2. 14 3. 2 4. 7 5. 11.1
  16. Chemistry(Please help)

    What is the pH of 0.144M aqueous solution of ammonium nitrate? I am not sure what to do. Would I do 10^-0.144^ = 0.71?
  17. chemistry

    What is tag name for the smallest particleof covakentlg bonded ccompound?
  18. chemistry

    how do you solve to find the molar mass for calcuim nitrate
  19. chemistry

    Only pure substance are homologous,true or false? Can you please explain too?
  20. Chemistry

    Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12
  21. chemistry

    how do you write the balanced chemical equation of Fe3+-ASA
  22. Chemistry

    Calculate the concentration of aqueous solution of barium hydroxide whose pH is 12
  23. Chemistry

    4.Report your answer in correct significant figures. A.1.32*10^4cm+2.1*10^2
  24. chemistry 12u

    how do i calculate this.. a solution of nitrous acid has a pH of 2.73 what is the [H3O+] ?
  25. Chemistry

    Above what Fe2 concentration will Fe(OH)2 precipitate from a buffer solution that has a pH of 8.03? The Ksp of Fe(OH)2 is 4.87×10-17 M3.
  26. Chemistry

    how do you make 50ml of .1 molar solution of benzylamine in acetonitrile
  27. Organic chemistry

    Is m-nitroaniline soluble in water, 1.0M NaOH, 1.0M HCl?
  28. Chemistry

    Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?
  29. chemistry

    For which salt in each of the following groups will the solubility depend on pH? Pb(OH)2 PbCl2 could you explain too? thanks!
  30. chemistry

    For which salt in each of the following groups will the solubility depend on pH? Pb(OH)2 PbCl2 could you explain too? thanks!
  31. Chemistry

    You have a 2.0 M solution of HNO3. To what volume in mL would you dilute 500.0 mL to achieve a pH of 4.00?
  32. chemistry

    Determine the gram molecular weight of 3.5 moles of H2O2
  33. Chemistry

    what is the molarity of 28.9 g of CaCl2 dissolved in water to make 0.78 L solutions?
  34. Chemistry

    How do i write a good discussion/conclusion for a lab report.
  35. Chemistry

    I'm having trouble understanding hybrid atomic orbitals. Could you please explain? Thanks
  36. chemistry

    What is the new volume of the balloon, where the pressure is 0.25 {\rm atm} and the temperature is -20^\circ C .
  37. Chemistry

    Given 3.90mL of 1.80M HCl diluted to .520L, whats the pH?
  38. Chemistry

    How many grams of perchloric acid are dissolved into 3.86 L of water, if the pH of the solution is 4.03.
  39. Chemistry

    If I have 1.93 x 10^-6 mole of chromium that would equal 100.35 mcg correct?
  40. chemistry

    write the equation for the reaction of mixing 4 ml of 3 M (ho)2so2 with 7 ml of 0.2 M naclo4
  41. chemistry

    Which region of the color spectrum does 14 x 10^16 exist in? I can't figure out this question but I got all the others
  42. chemistry

    What is the nitrogen-oxygen bond order in potassium nitrite
  43. Chemistry

    When chromium has 26 electrons, how many neutrons and protons does it have and what is it's standard notation
  44. Chemistry 11

    Mass of oxygen needed to react completely with 64.3 g ammonia?
  45. Chemistry

    Write the equation for the reaction of mixing 2 ml of 3 M (HO)2SO2 with 9 ml of 0.2 M NaClO4
  46. Chemistry

    Discuss the formation of the nickel ion with a 2+ oxidation number.
  47. Chemistry

    What is the pH of a saturated solution of lead(II) hydroxide? The Ksp= 4.0 X 10-15. a) 4.7 b) 7.2 c) 9.0 d) 9.1 e) 9.3 What should I do to solve for this? Thank you
  48. Chemistry

    Is the molarity of a KI solution constant when heated from 25C to 85C?
  49. Chemistry

    A buffer is made from 0.20 M sodium acetate and 0.20 acetic acid. Ka=1.8 x 10^-5. The ph is
  50. Chemistry

    What will happen to the room temperature if the refrigerator door is kept open?
  51. Chemistry

    What is the oxidation states for all three elements in the formula Rb2SO3 ? Is this correct?-1,+8,-2
  52. chemistry

    What functional group(s) must be present in a monomer of a condensation reaction?
  53. chemistry

    How many moles of HNO3 are present in 34.0 mL of a 4.70 M solution of nitric acid?
  54. Chemistry PLZ HELP!!!!!

    distinguish between aorphous and crystalline soilds and give an example of each
  55. Chemistry

    Which of the following surfaces does a true monolayer always form on? A. silicon B. gold C. both D. neither
  56. chemistry

    What is the mass, in grams, of 7.40×1020 molecules of caffeine, C8H10N4O2
  57. chemistry

    Why can't we add charcoal to benzoic acid in purification by sublimation
  58. chemistry

    what is the pH of an aqeuous solution with s hydroxide ion[OH-] concentration of 7.5x10-10 M?
  59. chemistry

    predict the pH of an aqueous solution that is 0.00378 molar in HBr
  60. CHEMISTRY

    What is the electron-domain (charge-cloud) geometry of ClF5?
  61. chemistry

    A dead alkaline battery is found to contain a compound of Mn and O. It's analysis gives 69.6% Mn and 30.4% O
  62. chemistry

    What volume of H2 (g) (at 750. mm Hg and 25 C) is produced from 50.0 mL of 0.214 M H2SO4 and 0.300 g of Al?
  63. chemistry

    What mass percent of a solution with 28.5 g of H2O2 and 300.0 mL of water?
  64. Chemistry

    What is the pressure of the gas if 0.145 mol occupies 227 mL at 35°C?
  65. AP Chemistry

    Hi, what is the true cant hoff factor for MgO, and NaCl, and BeS. Thanks
  66. Chemistry

    need help to balance half reaction in basic solution IO3 to I2
  67. chemistry

    What quantity of solid compound? 300ml of 4% (w/v) ammonium chloride.
  68. chemistry

    What quantity of solid compound? 300ml of 4% (w/v) ammonium chloride.
  69. chemistry

    How many moles of O2 are produced when 0.300mol of KO2 reacts in this fashion?
  70. chemistry

    How can a mixture of liquids be separated? Fractional distillation. Read about that.
  71. oragnic chemistry

    convert the measurement 92.0g into pounds (1lb=453.6g)
  72. Chemistry

    Need help anwering this: 43. Explain how the fission can be slowed in the nuclear reactor. Thanks -MC
  73. Organic Chemistry

    What are the monosaccharides present in starch, glycogen, and cellulose?
  74. chemistry

    What is the allowable concentration of six organic pollutants in drinking water?
  75. Chemistry

    How many grams will dissolve on 3.0*10^2mL of 0.050 M Ca(NO3)2? Ksp=8.7*10^-9
  76. Chemistry

    What is the total kinetic energy of 1.70 moles of N2 at 30.0 celsius? What formula do I use?
  77. Chemistry

    how is bumping avoided in the preparation of a hot water bath
  78. chemistry

    how would you say in words LiMnO2 ? would lithium manganese oxide be correct?
  79. chemistry

    how do i name the ionic compound bythis formula (NH4)2Cr2O7
  80. chemistry

    write a balanced equation for the chain reaction AL2O3
  81. Chemistry PLZ HELP!!!!!

    what conditions must exist for a polyatomic molecule to be nonpolar?
  82. chemistry

    Can you make a compound and show the electrons for magnesium and sulfur
  83. chemistry

    What is the allowable concentration of six organic pollutants in drinking water?
  84. Chemistry

    Decide which of the following bonds is least polar on the basis of electronegativities of atoms, H---S, Si---Cl, N---Cl.
  85. Organic Chemistry

    How can I tell if a structure of a compound will be optically active and will have an enantiomer?
  86. chemistry please help

    How many core electrons are there in a ground state sulfur atom?
  87. chemistry

    How many phosphorus atoms are in a 0.3352 g sample of Ca3(PO4)2 ?
  88. chemistry

    The measured density oe He at NTP is 0.1784g/l.what is the weight of one mole?
  89. CHEMISTRY

    How many electrons does the p-orbital of a methyl radical carbon CH3^. contain?
  90. Chemistry

    What does the ozonolysis followed by hydrolysis of an unsymmetrical, unbranched alkene form?
  91. Chemistry

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

    How many core electrons are there in a ground state phosphorus atom?
  93. chemistry

    how do i find ratio of volumeHcl/volumeNaoh for my first trail of titration?
  94. Chemistry

    Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C
  95. Chemistry

    Rank Na, Mg and K in order of increasing 2nd ionization energy a. Na < K < Mg b. Mg < K < Na c. K < Na < Mg d. K < Mg < Na e. Mg < Na < K
  96. Chemistry

    Which type of polyethylene has no side chains? A) LLDPE*** B) HDPE
  97. Chemistry

    Three acids,HCl, H2SO4 and H3PO4 are all 6M in concentration. what are their normalities
  98. Chemistry

    What is the molarity of a solution containing 40 grams of NaOH in 100 ml of soution
  99. Chemistry

    How to make 0.086M sodium phosphate when combined with 0.1N HCl has a pH of 6.2?
  100. Chemistry 151

    Calculate the concentration in g/dm3 of HNO3 in solution A. (H=1; N=14; O=16; Na=23)
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