chemistry! URGENT

61,713 results, page 100
  1. chemistry

    Account for the increase in reaction rate brought about by a catalyst.
  2. Chemistry

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

    What happens in terms of energy and stability when a covalent bond forms?
  4. Chemistry

    Is the structure for chlorous acid H O Cl O or H Cl O ? O I was thinking that both could be correct but I am not 100% sure.
  5. Chemistry

    Find the average kinetic energy per molecule of He at 30 degrees C
  6. 11th grade chemistry

    What is chemical formula of copper(ll) sulfide?
  7. chemistry

    Calculate whether or not a precipitate will form if 1.40 mL of 0.62 M NH3 are added to 4.4 L of 1.0 10-3 M FeSO4.
  8. chemistry

    In which anion do you expect a shorter O-O distance? BaO2 or KO2
  9. Chemistry

    How do I find the number of particles in 1 pound of NH3(Ammonia)?
  10. science chemistry

    enumerate the 100 alkanes and its molecular formula
  11. Chemistry

    An ideal gas cannot be... A. condensed B. cooled C. heated D. compressed
  12. Chemistry

    How many milliliters of 2.3 M NaOH are needed to neutralize 4.2 mL of a 5.4 M H2SO4 solution?
  13. chemistry

    Determine the percentage composition of each of the following compounds a) NaCl b) AgNO3 c) Mg(OH)2
  14. Chemistry

    Why are chemical equations balanced? Explain at the atomic level.
  15. Chemistry

    Calculate the volume of 0.3MHCL used to neutralise NaOH solution
  16. Chemistry

    If an atom gains energy, is it in a more stable or unstable state?
  17. chemistry

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

    HNO3+NaOH --- H2O+NaNO3 What is formed in the solution besides Cu(OH)2?
  19. Chemistry

    Briefly explain the role of CH3CO2Na in the preparation of Fe(C5H7O2)3.
  20. chemistry

    Find the normalization constant for the wave function (e^-bx).(e^+bx)(one dimension)
  21. Chemistry

    Calculate the temperature, in K, of 2.20 moles of gas occupying 3.50 L at 3.30 atm.
  22. chemistry

    How many milliliters of dirt are there in a hole that has a volume of 51 liter? How many mL of air
  23. chemistry ASAP

    can anybody please explain nomenclature to me ? how to name? for example: Na3PO3 NH4CLO2 AuNO2
  24. Chemistry

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

    besides a splint test, how can you determine whether hydrogen or oxygen is present?
  26. Chemistry

    Is there a value for the enthalpy of vaporization of water at any temperature? Or does the value change with different temperatures? And if there is just one value, do you know what it is?
  27. Chemistry

    Predict the empirical formula of the ionic compound, Cs and C. How would I do this? Is it Cs_2C?
  28. chemistry

    what mass of water is needed to completely react with 2.35g of Ca
  29. Chemistry

    Calculate the mass ( in grams) of one mole of methane molecules (to .01 g)
  30. Chemistry

    Which substance will be attracted to a charged balloon NH3 or CH4? Why?
  31. Chemistry

    Is the structure for chlorous acid H O Cl O or H Cl O ? O I was thinking that both could be correct but I am not 100% sure.
  32. chemistry

    How many moles of water are produced by the complete combustion of 14.4g of C5H12?
  33. chemistry

    in a exothermic reaction temperature changed from 30 to 43, reasons why I got those answers
  34. chemistry

    Why is it necessary to heat the hydrate gently at first and then more strongly only after most of the water has been driven off?
  35. chemistry

    I need help calculating [H3O] from pH and the pOH scale using my calculator. I have a TI-30XIIS
  36. Chemistry

    How many moles of KMnO4 are present in 300 mL of a 4.90×10−2 M solution?
  37. chemistry

    the combining ratio by weight of copper and sulfur assignment
  38. chemistry

    Calculate the osmotic pressure of a 6.0 × 10-2 M solution of NaCl at 20°C (293 K).
  39. chemistry

    What is similar about the outer shell of electrons in the halogen family?
  40. chemistry

    Calculate %tage by mass of all component element NaNo3 given,(Na=23,N=14,o=16)
  41. chemistry

    Calculate the pH when 0.446 g of Cu(NO3)2 (s) are dissolved in 250.0 mL of water
  42. organic chemistry

    (x/15)/[(1.5-x)/45]=5.8 how do I move these around to find x partition coefficient equation
  43. Bio Chemistry

    what are factors affecting rate of solution formation?
  44. Chemistry

    how much limestone would be required to change the ph value from 4 to 4.5 in 20000 cubic of water?
  45. Chemistry

    the pressure in a 10.0 L cylinder is raised from 483 mm Hg to 762 mm Hg. What is the new volume?
  46. Chemistry

    Name the organic product of the following nucleophilic substitution reaction OH-+CH3I
  47. Chemistry

    Name the organic product of the following nucleophilic substitution reaction. OH+CH3CH2I
  48. Chemistry

    Help arrange these elements in decreasing order of metallic property I, Mg, Al, Rb, Ca
  49. chemistry

    convert 278 amu to grams (scientific notation)
  50. chemistry

    What is the number of moles of NaOH in 1.91 mL of a 872.25 molar solution?
  51. chemistry

    A mothball, composed of naphthalene (C10H8), has a mass of 1.10g
  52. Chemistry

    How many grams of methanol could be vaporized by the addition of 22.45kJ of heat?
  53. chemistry

    What is the mass of nitrogen dioxide contained in a 4.32 L vessel at 48 °C and 1.40 atm ?
  54. Chemistry

    What does the point at which your curve crosses the horizontal axis represent?
  55. Chemistry

    How many moles of ethyl alcohol C2H6O are in a 25.0 sample? How do I calculate?
  56. Chemistry

    0.194M NaOH and 0.268 M NH4CL Find concentration of OH
  57. Chemistry 1151

    How many oles of Neon are in a 25mL container at STP?
  58. chemistry

    how would you solve this??? in short and long form? 238 12 (4) 1 92 U + 6 C ---> 0 N + _____
  59. Chemistry

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

    Why dissolving gases in the liquids is exothermic while the phase is down ? explain please
  61. Chemistry

    2A(aq)-> B(aq) +C(aq) Initial concentration of A and B is 1.00 M, with no C. Kc = 0.200 find equilibrium concentrations
  62. Chemistry

    an object with a mass of 24g and a volume of 32ml is most likely what substance
  63. chemistry

    What is the relative mass ratio of 11.31g of pb and 6.64g of au when pb has 3 mols and au and 2?
  64. Chemistry

    What element has the final electron configuration as 3s2 3p4?
  65. chemistry

    give 2 commercial or practical uses of this flame color phenomena.
  66. chemistry

    Determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 4.91. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.
  67. chemistry

    what is the molar volume measured at stp of 16 grams of oxygen
  68. Chemistry

    When We Balance Equations In Chemical Reaction,we Are Obeying The Law Of
  69. Chemistry

    which gas sample has the greatest volume at STP? a)10.0g Ar b)10.0g Kr c) 10.0 g Xe d) none of the above (They all have the same number)
  70. chemistry

    what is the mass in kilograms of 750 mL of a substance that has a density of 0.930 g/mL?
  71. Chemistry

    There are 200 mmoles NaOH/400ml. What is the molarity of the solution?
  72. chemistry

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

    How many Liters of a 5.00 M Zn(NO3)2 would be needed to react with 200 g of (NH4)2S?
  74. Honors chemistry

    What is the melting and boiling point of gold 16 carat
  75. Chemistry

    Which of the two is the stronger base?Give your reason. (a) HPO4 2- or PO4 3- (b)HS- or S2-
  76. Chemistry

    Give two bronsted acid-base that are not Arrhenius bases.
  77. Chemistry(Please check)

    Write the n, l, ml, and ms values for the first two elements, H and He. H: n=1 l=0 ml=0 ms=+1/2 He: n=1 l=0 ml=0 ms=+1/2 for the first electron for the second: n=1 l=0 ml=0 ms=-1/2 Are these correct?
  78. Chemistry

    I am 100 mL of a 0.5 M HCl solution,and i want to dilute it to exactly 0.1 M. How much water should i add?
  79. Chemistry

    How many milliliters of 6.50 M HCl(aq) are required to react with 5.95 g of an ore containing 35.0% Zn(s) by mass?
  80. Chemistry

    What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.
  81. chemistry

    convert 140 amu to kilograms (scientific notation)
  82. Chemistry

    Is there a value for the enthalpy of vaporization of water at any temperature? Or does the value change with different temperatures? And if there is just one value, do you know what it is?
  83. Chemistry

    Please help me arrange these elements in decreasing order of metallic property. I, Mg, Al, Rb, Ca Thank You
  84. chemistry

    what are the solvent and solute in a solution containing 100g of ethanol and 3g of sucrose?
  85. Chemistry

    Compounds that reduce the surface tension of water are considered to be?
  86. Chemistry

    What is the weakness of the Bronsted-Lowry acids and bases theory?
  87. chemistry PLEASE HELP

    How many milligrams of sodium azide will produce 8.35 Liters of N2 at STP???
  88. Chemistry

    How much sodium carbonate is needed to precipitate nickel sulfate
  89. Chemistry

    Electron Configuration: What numerical values of l are possible for n=4. 1,3,5,7 what ae their corresponding letters. s,p,d,f Are these correct?
  90. Chemistry

    What is the pH at the equivalence point in the titration of 10.0 mL of 0.6 M HZ with 0.200 M NaOH? Ka = 7.0 × 10−6 for HZ.
  91. Chemistry

    What mass of Cu(IO3)2 can be formed from 0.690g of CuSO4-5H2O?
  92. Chemistry

    How many grams of NaCL are required to make 250ml of a 0.4M solution?
  93. Chemistry

    What is the pH of a buffer solution that is 0.20M methylamine and 0.15 M methylammonium chloride. which do i get the pH of
  94. chemistry

    Which must be a mixture of substances? a- Solid b- Liquid c- Gas d- Solution
  95. chemistry

    Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).
  96. Chemistry

    why can't the enthalpy of magnesium be measured using a coffee cup calorimeter?
  97. chemistry

    How many grams of potassium iodide, KI, are required to make 2.0 L of a 0.1M solution?
  98. chemistry

    what is meant by the term coefficient in relation to chemical equation
  99. Chemistry

    How can you determine which acid solutions (all at 0.10 M) has the highest concentration of anions?
  100. chemistry

    can someone please show me the steps of setting up the emirical formula for NaN3