chemistry! URGENT

61,729 results, page 49
  1. Chemistry

    The mass % of H in methane (CH4) is ? How would i solve this?
  2. chemistry

    What is the mass of 1 mL of water at 4 deg Celsius?
  3. chemistry

    How much energy is needed to melt 25.4 grams od I2?
  4. Chemistry

    What does it mean when a problem says "give the values for STP"?
  5. chemistry

    How many osmoles are there in 6.00 ML of a 6.0 N mg3(po4)2 solution?
  6. chemistry

    what is the density of 700 ml of a gas that has a mass of 7 g?
  7. chemistry

    What physical changes take place within a solid as it melts?
  8. chemistry

    a compound contains only c,h and o. c=48.65% and h=8.11%.a)calculate its emperical formula
  9. Chemistry

    What must be the pH of a solution that is 0.049 M Fe3+ to just cause Fe(OH)3(s) to precipitate?
  10. Chemistry

    how can you prepare 300ml of 15% h2so4 solution
  11. chemistry

    hi I have a hard time understanding the following question: The
  12. Chemistry

    KOH + KHP --- balanced equation???
  13. chemistry

    What is the heaviest element that has only one isotope and is not radioactive?
  14. CHEMISTRY

    ASSIGN FORMAL CHARGES TO FOLLOWING STRUCTRE, H-N-C-H3
  15. Chemistry

    explain different forms of polymerisation in glucose
  16. chemistry

    The scales of a balance are 70, 3 and 0.9 which is between 0.011 and 0.012 .
  17. chemistry

    how does an ionic solute dissolve in water?
  18. Chemistry

    What is the enthalpy change when 25 g's of PCl5 are decomposed /\ H= 90
  19. Chemistry

    What is the chemical reaction for: The oxidation of 2-pentanol
  20. Chemistry

    Would it take more 0.1 M HCl or 0.1 M H2SO4 to neutralize 30 ml of NaOH?
  21. Chemistry

    Prepare 250 cc n/10 KMno4 solution
  22. Chemistry

    Prepare 250 cc n/10 KMno4 solution
  23. Chemistry

    How many oxygen atoms are in 6Al (SO4)3
  24. chemistry

    How to prepare 14M Sulfuric acid
  25. Chemistry

    Prepare 250 cc n/10 KMno4 solution
  26. chemistry

    oxidation state of nitrogen. no2-
  27. Chemistry

    How many carbon mol in 2.2grams of CO2
  28. chemistry

    oxidation state of nitrogen in n2h4
  29. Chemistry

    What's the lewis dot structure for CH2Cl2 ??
  30. Chemistry

    Are volume and temperature directly proportional?
  31. chemistry

    how many gram molecules are present in 4.9g of H2SO4
  32. chemistry

    does a low dipole indicate a strong acid
  33. Chemistry

    What is the structural formula for 1-bromo-3,4-dimethylheptane
  34. Chemistry

    What is the pH, pOH [OH-] and [H+] for 0.000535 M hydrosulfuric acid?
  35. chemistry

    How are absorbance and transmission spectra related?
  36. Chemistry

    How many atoms of 0xygen are there in 8.43 g of KMnO4? Could someone please explain this?
  37. chemistry

    how many grams of aluminum are in 25.0 ml of a 14%(w/v) solution of Al2O3?
  38. chemistry

    what's the lewis dot diagram for methanol?
  39. chemistry

    Why is Fe3+ likely to precipitate in the presence of oxygen?
  40. Chemistry

    In an IR spectrum at wavelength = 1454cm-1 its where a CH2
  41. chemistry

    How do you express the number 6 as two significant figures?
  42. chemistry

    2.70 g/cm3 to pounds per cubic foot
  43. chemistry

    2.70 g/cm3 to pounds per cubic foot
  44. Chemistry

    What is the pH of a solution with a concentration of 4.7 × 10-4 molar H3O+?
  45. chemistry

    The number of moles in 15.39g of C2H6O?
  46. Chemistry

    How would you balance this equation Mg(s)+FeCl3(aq)=Fe(s)+MgCl2(aq)
  47. chemistry

    0.0386mol glucose in 88.0ml of solution
  48. Chemistry

    Is this equation correct? 8Fe + S8 --> 8FeS
  49. Chemistry

    what is the balanced chemical equation for the reaction between Fe and S? ?Fe + ?S -->
  50. chemistry

    would measuring dimensions of a solid always be possible? Explain thanks =]
  51. chemistry

    what two kinds of heat changes water's form?
  52. chemistry

    How to calculate the molarity of commercial bleach
  53. chemistry

    what are the properties affected by intermolecular forces? please help
  54. chemistry

    28.66ml(.7857 g/cm cubed)= meters
  55. Chemistry

    What the density of 100 mL of HCL at 18 degree C?
  56. Chemistry

    How do I quickly identify whether or not a salt is soluble?
  57. Chemistry

    What is the formula of a substance that contains 0.0920 g of C and 0.0180 g of H?
  58. chemistry

    What mass of copper will be deposited by a current of 7.89?
  59. Chemistry

    how can a salt be related to a particular acid and a particular base
  60. chemistry

    why we cant use hcl to react with Fe to create fecl3?
  61. Chemistry

    What is the molecular equation for HCl(aq) + NH4OH(aq)?
  62. Chemistry

    Could someone please explain the concept of electromagnetic radiation to me please? Thank you!
  63. Chemistry

    What is the chemical reaction for: The oxidation of methanol
  64. chemistry

    how many significant figures are in the measurement 0.002 ml? 2??
  65. Chemistry

    how can a salt be related to a particular acid and a particular base
  66. Chemistry

    What is the mass of a 4 kg object, A. On the earth (g=-10 m/s/s) B. On the moon (g=-2 m/s/s)
  67. chemistry

    What is the name of this compound CH3CHCH2CH3 ...| ...OH (this should fall directly under "CH")
  68. Chemistry

    if you produce 5.7 of H2O, how many liters of O2 will be required?
  69. Science- Chemistry

    What does NaHco3 + HCl produce?
  70. chemistry

    G naught doesnt tell you whether the reaction is spontaneous or not
  71. Chemistry

    How many molecules are present in 1.00 mg of asprin, C9H8O4?
  72. Chemistry

    The pH of a .200M HBrO solution is 4.67. What is the acids Ka?
  73. Chemistry

    what does it mean when we say that concentrated nitric acid has 16 molars
  74. chemistry

    How many sodium ions in .00 mol of NaCl?
  75. Chemistry

    What is the Concentration of 5.6 of grams of mg (OH)2 dissolves in 550ml
  76. chemistry

    how many grams of phosphorus are there in 160 g of P4O10
  77. chemistry

    calculate for weak acid with ph 0,1M of CH3COOH (K=1,8*10-5)
  78. chemistry

    calculate for strong electrolyte the ph of 0,1M pf HNO3
  79. chemistry

    How do you know that atoms can be separated without chemical reactions?
  80. Chemistry

    What's the difference between ionic and covalent bonding? ~thank you
  81. chemistry

    15 GREM OF C6H12O6 WILL PRODUCE HOW MUCH CO2?
  82. chemistry

    Why are optical isomers not found for CH2ClBr?
  83. Chemistry

    How many milliliters would it take to titrate 10.0 mL of 0.75 M HCl with 0.10 M NaOH?
  84. chemistry

    What must be the pH of a solution that is 0.067 M Fe3+ to just cause Fe(OH)3(s) to precipitate?
  85. chemistry

    NaOH(aq)+H3PO4(aq)¨Na3PO4(pq)+H2O(l) Please help.
  86. chemistry

    what is the temprature at which molecular motion ceases??
  87. chemistry

    what is kind of reaction is 2C(s)+mno2(s)Mn(s)+2co(g)
  88. chemistry

    How many grams of solute are in 2.l L of 3.7Moles of Al(NO3)3
  89. Chemistry

    Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
  90. chemistry

    How can Ka or Kb be used to determine if an acid is strong or weak?
  91. Chemistry

    Calculate the pH of a solution at 25.0 °C that contains 1.94 × 10-10 M hydronium ions.
  92. chemistry

    for oxidation number of Fe(CO)5 I don't understand why Fe is zero
  93. Chemistry

    Explain how a calibration curve is produced
  94. Chemistry

    Why can't milk of magnesia (Mg(OH)2), act as a buffer?
  95. Chemistry

    If an element has 12 protons and 17 neutrons, how many electrons must it have?
  96. analytical chemistry

    why is it necessary to buffer the solution at pH 10 during titration?
  97. Chemistry

    What is the freesing point for ethanol and methane
  98. chemistry

    what volume of O2 at STP is needed to react with 4.52 g of K
  99. Organic Chemistry

    Which of the following would have the lowest stretching frequency A. C=C B. C-O C. C=O D. N=O E. C-H
  100. Chemistry

    Calculate the pOH of a 0.410 M Ba(OH) solution.