chemistry! URGENT

61,409 results, page 100

  1. Chemistry

    how many molecules of N2 could fit in a 2.00L soda bottle at 23C and 755mmHg
  2. Chemistry

    The chemical equation for ionic reaction between Na2S and AgNO3??
  3. Chemistry

    Calculate the value of ΔS when 1.10mol of Br2(l) is vaporized at 58.8 ∘C
  4. chemistry

    what is the rate law for NO+O3=NO2+O2 in second order reaction if [NO] Doubled
  5. chemistry

    What is the % of a solution containing 18.0g of NaCl in 65 ml of water 18.0/65 * 100 = 27% Right? Wrong?
  6. chemistry

    How much heat is produced by the complete reaction of 5.91kg of nitromethane?
  7. Chemistry

    How much heat is required to boil 90.0g of water at its boiling point?
  8. chemistry

    the wavelength(nm)of a ball bearing with a mass of 10g, and a velocity of 10cm/s is what?
  9. chemistry

    In generating the synchronous spectrum, it is not necessary to specify the wavelength range, why?
  10. chemistry

    calculate the solubility in grams of KCL3(s) per 100 ml of water
  11. Chemistry

    Determine Qsp if 8.7 ml of 2.1 M AgNO3 is added to 1.7 ml of 1.5 M CaCl2 .The Ksp of AgCl is 1.77 x 10^-10.
  12. Chemistry

    Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.
  13. Chemistry

    What special precautions should be taken when generating hydrogen gas?
  14. Chemistry

    What happens when a burning candy is placed in a jar of carbon(iv) oxide?
  15. Chemistry

    What volume of 1.45 H2SO4 is required to neutralize .050L of .75M KOH?
  16. chemistry

    Why does acetone evapourate faster than water in terms of intermolecular forces
  17. Chemistry

    Determine the pH of a buffer made from 250 ml of 0.50M HF and 150 ml of 0.75 M NaF.
  18. Chemistry

    If 125 g of ice at 0.0°C is added to 1.95 L of water at 90 °C, what is the final temperature of the mixture?
  19. chemistry

    109% of carbon,18,2% of hydrogen and 73% of oxygen how do i calculate emperical formular?
  20. chemistry

    How can I change ca(hco3)2+cl(aq)=cacl2(aq) + co2(g) + h2O in to ironic equation?
  21. Chemistry

    Did Dalton and Thomson believe that the atom was made of solid mass?
  22. Chemistry

    analyze and describe the different types of genetic mutations and their effects
  23. Chemistry

    Balance TeO3^3- + N2O4 --> Te +NO3^- using oxidation numbers
  24. college chemistry

    Calculate the molarity (M) of 156.2g of H2SO4 in 1.275L of solution.
  25. chemistry

    Which of the following numbers is most significant (a)2000 (b)2.00033 (c)6.67×10 (d)0.000122
  26. Chemistry

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

    For an equation N2(g)+3H2(g) double arrowed to give 2NH3(g) what is the catalyst?
  28. chemistry

    Why can't lead chloride be directly prepared by adding hydrochloric acid?
  29. chemistry

    find the molar mass of 7.5gm of a gas occupying 5.8 lt volume at s.t.p.
  30. chemistry

    What volume of 0.5M H2SO4 will exactly neutralise 20cm3 of 0.1MNaOH solution?
  31. chemistry

    How many grams of table sugar (C12H22O11) will be needed to make 3.5 L of a 11.5 M solution?
  32. AP Chemistry

    The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 24.6 g of the compound?
  33. Chemistry

    How many joules of heat are required to raise the temperature of 550 g of water from 12°C to 18°C
  34. Chemistry

    How many joules of heat when a 640 g piece of copper cools from 375° C to 26° C
  35. Organic chemistry

    What type of alcohol is used in the production of alcoholic beverages?
  36. chemistry

    how much grams of cao is produced by oxidation of 1gm of calcium
  37. Chemistry

    How many moles of acetic acid are present in 10.00 mL if the concentration is 0.500M HC2H3O2?
  38. chemistry

    Balance by partial methods P4 + hno3 = h3po4+ no2+h2o
  39. Chemistry

    A compound contains 84% carbon and 10% hydrogen.find the emperical formula.
  40. chemistry

    vapour density of gas is 11.2 volume occupied by 22.4gms at STP?
  41. Physical Chemistry

    If 5.00 mL of 3% H2O2 is decomposed, how many mL of gas will be produced at 1.01 bar and 25C?
  42. Chemistry

    For the combustion of 100. gm of methane, how much heat would be generated?
  43. Chemistry

    Calculate the amount of hydrochloric acid in 25cm3 of 0.100M HCl
  44. Chemistry

    If you have light that has a frequency of 2.88 x 10 to -9 power Hz, what is the wavelength? I don't know how to do this and what formula to use.
  45. organic chemistry

    the color change at the endpopint should persist for 30 second why
  46. Chemistry

    How do halogens (Cl2, Br2, I2) react with halides (Cl-, Br-, I-)? Can we explain this reactivity?
  47. chemistry

    What is the mass percent of nitrogen in ammonium carbonate, (NH4)2CO3?
  48. chemistry

    The density of an elemental gas is 2.14 kg/m3 at STP. What is its approximate molecular weight?
  49. chemistry

    Name a metal which is found in liquid state at ordinary temperature?
  50. Chemistry

    How much KNO3 will dissolve in 200ml of water at 50 degrees Celsius?
  51. Chemistry

    List Sn , Sn2+, Sn4+ in order of decreasing ionization energy
  52. Chemistry

    How can I tell from a graph of temperature vs. time if a reaction is endothermic or exothermic?
  53. Chemistry

    Why does the temperature in exothermic reactions increase, reach a maximum, and then decrease?
  54. Chemistry

    How many ml of water must be added to 40.0 ml of 2.50 m koh to prepare a solution that is 0.212 m?
  55. Chemistry

    Ion flame test Why is it important to not let the wooden splint burn ?
  56. chemistry

    Calculate the energy difference for the transition of n=6 to n=2 for 1.00 mol of hydrogen atom?
  57. chemistry

    How many grams of Ca(OH)2 can be dissolved in 550mL of a .0500 M NaOH solution. Ksp - Ca(OH)2 is 5.5 x 10-5
  58. Chemistry

    Does adding a proton to lithium-7 make it a positively charged ion?
  59. Chemistry

    Determine the number of grams of water in 7.00 g of copper(II) sulfate pentahydrate.
  60. Chemistry

    If 0.400ml CH3CO2H and 0.200ml of 0.100M NACH3COO What is the pH of the resulting solution.
  61. Chemistry

    How to I find the spectator ions of BaCl2+K2SO4->2KCl+BaSO4
  62. Chemistry

    can maleic anhydride dimerize or in other words react with itslef?
  63. chemistry

    find the percentage by mass of nitrogen present in (NH4)2SO4
  64. chemistry

    how do you go about to find the grams that will react with 90g acetic acid
  65. chemistry

    The solubility of Na3(PO4) is 0.025 M. What is the Ksp of sodium phosphate?
  66. Chemistry

    Which element's 4+ ion would have the following electron configuration? [Kr]4d^10
  67. ics

    Chemistry,what is the k.e of 4 moles of nitrogen gas at 127 degree centigrade?
  68. 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
  69. Chemistry

    What is the frequency of the photons emitted by hydrogen atoms when they undergo transition from n=4 to n=3?
  70. Chemistry

    2.0 gram of C2H4 is reacted withO2. What mass of water is produced?
  71. Chemistry

    Explain what would happen if a saturated solution of kno3 at 50°c is heated
  72. Chemistry

    CO(g) effuses at a rate that is ______ times that of Xe(g) under the same conditions.
  73. Chemistry

    What will happen if 100g of NaCl is placed in 200mL of water at 70C
  74. Chemistry

    How many miles of oxygen would it take to react with 1.0 moles of magnesium
  75. Chemistry

    How many joules are needed to change 163.34 g of water at 54.1 °C to steam at 100 °C?
  76. chemistry

    Calculate the molarity of a 6% solution of ammoniun nitrate of density 1.025 g/mL
  77. chemistry

    Which among hydride, methyl or phenyl shift is the most preferred?
  78. chemistry

    Report the preparation of stock solution of 0.04M of sulphoric acid
  79. chemistry

    report on the preparation of 0.004M stock solution of ethanoic acid
  80. chemistry

    How many grams do 6.2×1024 atoms of argon weigh? Answer in units of g.
  81. chemistry

    How many molecules are in 0.0700 mol NH3? Answer in units of molec.
  82. Chemistry

    How many grams of aluminum sulfate are produced if 15.7 g Al reacts with excess CuSO4?
  83. Chemistry

    What happens if we add 200 mg of calcium hydroxide in 100 g of water at 20 ° C?
  84. chemistry

    Ans me plxxx Identify the hydrogen bonding in DNA and ice......
  85. chemistry

    How does salt affect the boiling point of water? (in simple words)
  86. Chemistry

    Determine the number of grams present in 3.11x 10^23 atoms of water
  87. Chemistry

    Which of the following has the lowest conductivity when dissolved ? F2, H2O, MgO, or LiCl
  88. Chemistry

    In interhalogen compounds of the type Ab5 and AB7, B is invariably flourine,why ?
  89. Chemistry

    Why do argon and flourine not form compounds like Xenon Flourides?
  90. Chemistry

    in paramagnetic ions all the bonds formed between Mn and O are covalent,why?
  91. Chemistry

    the ka value of 0.001moldm-3 solution of a weak acid is 1.6*10-6 calculate the ph and the pka
  92. Chemistry

    concentration of H30+ in 0.0250 moldm-3 aqueous epuation of HCL
  93. chemistry

    volume of 0.5 N sodium hydroxide required to neutralize 20 ml of 0.1 N acetic acid ?
  94. Chemistry

    At what pressure would 0.150 mole of nitrogen gas at -23.0^o C occupy 8.90 L ?
  95. Chemistry

    If the density of a gas is 1.2g/L at 745.torr and 20 Celsius, what is the molecular mass?
  96. Chemistry

    Calculate the following and write your answer in scientific notation 6.6 x 10^6 (8.8 x10^2) x (2.5 x 10^3)
  97. CHEMISTRY

    find the concentrations of H+, HCO3-, CO3 2- in a 0.025M in H2CO3 solutions
  98. chemistry

    The formula for rust can be represented by Fe2O3. How many moles of Fe are present in 27.6 g of the compound?
  99. Chemistry

    A 0.10M solution of a certain monoprotic weak acid has a pH of 2.44. Calculate Ka.
  100. Chemistry

    How is 4FeS2 + 11O2 = 2Fe2O3 +8SO2 a single replacement reaction?
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