chemistry! URGENT

61,546 results, page 83

  1. Chemistry

    How commonly is salicylic acid used or found in nature ?
  2. Chemistry

    6.2g of NaOH is added to 800ml of water What is the molarity of the solution? What is the pH?
  3. chemistry

    Devils food cake has a [H+] of 2.7 x 10-8 mol/L. calculate pH pOH [OH-]
  4. Chemistry

    Give two physical properties of ionic compounds? Thanks.
  5. Chemistry

    is delta S positive for the heating of water from 25 to 75 degrees Celsius?
  6. Chemistry

    How many g of CaCl2 are required to prepare 0.250 L of a 0.200 M solution?
  7. chemistry

    How many grams of SrCl2 is required to prepare 1 molar solution of it,
  8. chemistry

    why we add acid to the standardization of sodium thiosulphate solution?
  9. Chemistry

    1. Convert 1.2 X 10^24 molecules of chlorine to grams. Ans: 70.67 gms
  10. Chemistry

    Which molecule would be more soluble in water ? H----C=C---H or BeCl2
  11. chemistry

    what is the total number of atoms in the compound (NH4)3PO4?
  12. chemistry

    How many molecules are contained in 1.30 mol O2? Answer in units of molec.
  13. Chemistry

    Why can't a single spectral line be used to identify an element?
  14. Chemistry-Dr.Bob

    Why is gasoline (octane) better than diesal (cetane)?
  15. Chemistry

    Why are the atomic masses of elements usually decimal numbers?
  16. Chemistry

    A compound contains 69.9% iron and 30.1% oxygen. What is its empirical formula?
  17. Chemistry

    When 46.0 ml of 0.18 M HNO3 and 58.0 ml of 0.23 M LiOH are mixed, the concentration of [OH-] after mixing is ?
  18. Chemistry

    how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?
  19. Chemistry

    What is the equation for the reaction between stearic acid and ammonia?
  20. Chemistry

    How much oxygen is needed to form 50 grams of water?
  21. Chemistry

    what is the concentration of 0.009 M solution of nh3 at 25 degree fahrenheit?
  22. chemistry

    hcl + naoh ==> h2o + nacl limiting reagant
  23. Chemistry

    What is the principal of seperation of metal ions in qualitative analysis?
  24. chemistry

    summarized the atomic structure and discovery of nucleus and protons
  25. chemistry

    using the Kw for pure water, show that: pH = pKw - pOH
  26. chemistry

    what mass of excess reactant remians when the reaction is completed?
  27. chemistry

    why are there only certain colours in an atomic emission spectra?
  28. chemistry

    If 15.22 g of mercury (II) oxide decompose, how many moles of oxygen can be produced?
  29. organic chemistry

    is it anything other to form isopentyl propionate
  30. chemistry

    What volume of oxygen is required to completely combust 80 of butane
  31. General chemistry i

    Is this a redox reaction? 4Cr+3O2 -> 2Cr2O3
  32. Chemistry

    what type of reaction occurs in Al+SnCl4 ? and what is the balanced equation
  33. Chemistry

    How many mL of 0.101 M HCL are needed to neutralize 1.00 g of potassium hydroxide?
  34. Chemistry

    How many millimoles of HCl (aq) are neutralized by 0.35 g of CaCO3 (sol)? mmol
  35. Chemistry

    Mole calculations: How much does 2.5 x 10^24 molecules of p2o3 weigh ?
  36. Chemistry

    How many grams of solute are in 0.504 L of a 0.350 M K2CO3 solution?
  37. Chemistry

    Organic nhi aati smjh... Koi smjhado na
  38. Chemistry

    why does the FeCl3 test positive for phenols and not other -OH compounds?
  39. Chemistry

    What is the mass of Na2SO4 is needed to make 1.5 L of 3.0 M solution? Na=23 g.: s = 32 g: O=16g.)
  40. Chemistry

    What mass of naoh is neutralized by 43.55ml of 0.145m H2SO4?
  41. Chemistry

    What is the mass of all atoms in 2Fe+3O2=2Fe2O3
  42. Chemistry

    How do i figure out if 2NO2 -> N2O4 is a redox reaction
  43. Chemistry

    name the three fundamental particles present in an atom
  44. chemistry

    what type of a ligand would 18 crown 6 ether be? hexadentate?
  45. Chemistry

    Compare the diffusion rates of hydrogen and oxygen gases.
  46. Chemistry

    How many moles of oxygen (O2) are required to completely react with 27.4 mol of H2?
  47. Chemistry

    How do I make 500ml of a 0.3% chlorine dioxide solution from 6.4% tablets?
  48. Chemistry

    Why is methyl orange not suitable indicator for h2c2o4 and naoh
  49. chemistry

    Which one has more hydrogen bonding- ethanol or methanol
  50. Chemistry

    Which reagent has been oxidized in the following equation ? H2(g) + N2(g) === NH3(g)
  51. Chemistry

    Which reagent has been oxidized in the following equation ? H2(g) + N2(g) === NH3(g)
  52. Chemistry

    How many moles of O2 must react with 0.550 mole ofMethanol?
  53. Chemistry

    How many grams of NO2 are needed to form 100.0g of HNO3?
  54. Chemistry

    If it is known that the iron(ii) salt is FeSO4.7H20 calculate the %Fe from the formula
  55. pre-ap chemistry

    how to make 100 mL of a 0.500 M CuSO4 solution
  56. chemistry

    who prepaire tris buffer 0.2 mmol/lit calculation
  57. BIO chemistry

    What is the pH of a mixture of 0.042M NaH2PO4 and 0.054M Na2HPO4
  58. Chemistry

    What mass of CaO, can get by the decomposition of 250 g of CaCo3 with 80% purity?
  59. Chemistry

    What is the value for Kb for the formate anion, HCOO-? Ka(C7H5O2)=2.1x10^-4.
  60. chemistry

    how do i figure out grams/tablet if I am in units of mol/L? >_>
  61. chemistry

    60 gram of urea is dissolved in 250ml. Calculate the molarity
  62. Chemistry

    addition of conc H2SO4 to Ph-CH(CH3)OH gives product?????
  63. Chemistry

    How many grams of solute are present in 795 ml of 0.130m KBr?
  64. chemistry

    calculate the number of moles of Mg in 0.12g(relative mass of Mg=24)
  65. chemistry 12u

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

    A solution is 25% by mass calcium nitrate and has a density of 1.21 g/mL what is the molarity?
  67. Chemistry

    Concentrated nitric acid is 70% HNO3 and 14.7 M. What is the density of the solution?
  68. Chemistry

    How can I make 100ml 0f 2N of HCl? purity is 35% and density is given as 1.18 g/mL
  69. Chemistry

    The bond angle of water is decreased from 109Degree 28' to 104Degree 24',why?
  70. Chemistry

    Why must not the condensed water drip into the flask?
  71. chemistry

    How many grams of CO2 are evolved on heating 200 g of CaCO3.
  72. Chemistry

    Which amount of heat is released when 75.0 g of water at 0° C is frozen to ice?
  73. Chemistry

    Define indicators giving four examples and their PH ranges
  74. Chemistry

    Using benzene as an example to illustrate substitution reaction
  75. Chemistry

    a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb
  76. Chemistry

    Identify the compound and classify its functional group in the image H H H H H H H-C-C-C-O-C-C-C-H H H H H H H
  77. Chemistry

    a 0.20 mol/l solution of weak base hpo4 has a ph of 9. find the Kb
  78. Chemistry

    How many moles are in 7.5x10^24 molecules of carbon dioxide? Grams?
  79. chemistry

    what fraction of voids are occupied by sp3 carbon in diamond
  80. Chemistry

    Why ionic compounds have high melting points?
  81. chemistry

    calculate the normality of 5.56 grams of K2Cr2O7 dissolved in 500 mL
  82. chemistry

    caculate the molar concentration of 1ppm solution of NaCl?
  83. chemistry

    How many degenerate orbitals have the following name? 2s 3p 5d 4p 5s I don't get this question
  84. Chemistry

    What is the amount of oxygen needed to create output 20gm?
  85. Chemistry

    What is the kb of a 0.0200 m ( at equilibrium) solution of methyl amine, ch3nh2, that has a ph of 11.40?
  86. chemistry

    Calculate the pH of a solution containing 10 g / L of NH4Cl (Kb NH3 = 1.8x10-5
  87. Chemistry

    What is the test for ammonium formed on hubber process? i need your help
  88. Chemistry

    What volume of nitric dioxied at s.t.p from the below equestion N2+O2=2NO
  89. chemistry

    how much ml of oxalic acid is needed to standardize 0.1M NaoH
  90. Chemistry

    How much heat is produced by the complete reaction of 5.29 kg of nitromethane?
  91. chemistry

    How to solve CoCl2+HO2- ------> Co(OH)3+ Cl- by half reaction method
  92. Chemistry

    Describe how lead(II) iodide cen be prepared in the laboratory
  93. Chemistry

    The weight of a pure sample of KClO3 to be decomposed in order to get 0.96 of O2.
  94. Chemistry

    How many mL of 0.1 N NaOH are required to react with 100 mEq of H2SO4?
  95. CHEMISTRY

    Why is glass considered as a supercooled liquid? answer please!!!
  96. chemistry

    what is the concentration of na and co3 ions in 0.2M aqueous solution of na2co3
  97. CHEMISTRY

    CALCULATE THE DECREASE IN TEMPERATURE FOR 22.0 G SILVER THAT LOSES 625 J
  98. math or chemistry

    Check pls. 5.4 x 10^-2 by 2.5 x 10^-3 by 7.9 x10^-3 m volume = 107.44 x 10^-8 m^3
  99. Chemistry

    How does hybridisation of PCL5 change when it is decomposed to PCL3 and Cl2?
  100. chemistry

    When are more products of a reaction available initially than at equilibrium? A. K = 0 B. Q < K C. Q = K D. Q > K
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