chemistry! URGENT

61,442 results, page 30

  1. Chemistry

    What is 6.35 g divided by 6.02 x 10^23
  2. chemistry

    6.04g
  3. chemistry

    what is mass
  4. chemistry

    what is the pH of .10 M NH4CL?
  5. chemistry

    yrjtukj
  6. chemistry

    what is a positron
  7. chemistry

    wh at is prtoplam
  8. chemistry

    what is cryogenetics
  9. Chemistry..

    60.0 g O2=___________molecules O2
  10. chemistry

    how do you know that Al(OH)3(s) is a base?
  11. AP Chemistry

    The pH of a solution of Sr(OH)2 is 12.42. What is its (OH^-)
  12. Chemistry 12

    The [OH-] of a solution with a PH 5.75 is is it 5.6*10-9M?
  13. chemistry

    what is molality ?
  14. chemistry

    what is molality ?
  15. chemistry

    AMU ?
  16. Chemistry

    Define a.m.u?
  17. Chemistry

    Define a.m.u?
  18. chemistry

    what is equillibrium?
  19. CHEMISTRY

    WHAT IS ATOMICRADIUS
  20. Chemistry

    Answer
  21. Chemistry

    what are the products of Ca +H +OH-->?
  22. Chemistry

    What is a supernatant
  23. chemistry

    V1 = 0.55 L, P1 = 740 mm Hg, V2 = 0.79 L, P2 = ?
  24. chemistry

    50 compound
  25. chemistry

    na+c1-(aq)+hc1(aq)
  26. chemistry

    what is a catalyst
  27. Chemistry AS

    CALCULTE
  28. chemistry

    convert 3.0m to yd
  29. chemistry

    G=NEV
  30. chemistry

    What is the pH of a solution if [H+] = 2.3 x 10–5 M?
  31. chemistry

    46,318.97
  32. CHEMISTRY

    COPPER
  33. chemistry

    Al(oH)3+HcL=
  34. CHEMISTRY

    The [OH1-] with a pH of 5 is
  35. chemistry

    What is periodicity.
  36. Chemistry

    Can a pH be below 1?
  37. chemistry

    what is a mole
  38. chemistry

    science
  39. sammy

    chemistry
  40. Chemistry

    hellop
  41. chemistry

    what is thiosulphate
  42. chemistry

    1.what are the functions of pH?
  43. Chemistry

    Fe+o2+h2o->fe(oh)3
  44. chemistry

    pH of 1.0 x 10-8 M RbOH
  45. Chemistry

    2.36 x 10^4 s= ? days
  46. Chemistry

    what are dipoles?
  47. Chemistry

    What is NaOH?
  48. Chemistry

    What is Enthalpy?
  49. chemistry

    (2.00x10⁵)⁻³
  50. chemistry

    what is 1.79 x 10^-20 in kJ/mol?
  51. Chemistry

    What is the pH of a solution with a [H+]=10^-8?
  52. Chemistry

    What is the pH of a solution with a [OH-] of 10^-2
  53. Organic Chemistry

    Hello, I have done an experiment in Organic Chemistry called :SN1 Reaction: Synthesis of t-amyl chloride from t-amyl alcohol, there are some questions that I am unsure about, 1) What are the 2 rules of HCl in this reaction? Can you use NaCl instead of HCl to synthesize t-amyl ...
  54. Chemistry Dr. BOB

    I don't get it!! In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for ethanol. I need help with balancing the equation i ...
  55. chemistry

    if you have one mole of CH3CH3(g) + 2 moles of Cl2 (g) and form one mole of C2H4Cl2 (l) + 2 moles of HCl (g) assuming a 90% yield calculate the amount of each reactant needed to form 1.5 kg of product I started the problem following the rules from the chemistry stochiometry ...
  56. cHEMISTRY

    wHAT IS THE SYMBOL FOR THE ION WITH 13 PROTONS AND TEN ELECTRONS? CAN U EXPLAIN HOW TO GET YOUR ANSWER, AND CAN YOU GIVE ME A WEBSITE THAT HELPS ME WITH CHEMISTRY 13 protons will be element with atomic number of 13. Look on the periodic table and see atomic number 13 is ...
  57. Chemistry (A level)

    I was given a Chemistry question on the titration of a strong base being added to a weak acid. The question was: "Calculate the pH in a titration when 10.0cm^3 of a 0.10moldm^-3 solution of NaOH is added to a 10.0cm^3 of 0.25moldm^-3 solution of ethanioc acid? (Ka = 1.76 x 10...
  58. Chemistry(Please check)

    . Ksp for Fe(IO3)3 is 10-14. Two solutions, one being iron(III) nitrate and the other being sodium iodate, were mixed. At the instant of mixing, [Fe3+] = 10-4M and [IO3-] = 10-5M. What happens? My answer is that a precipitate forms because Qsp > Ksp. Would you agree? ...
  59. Algebra

    70 students are studying mathematics,physics & chemistry.40 students study mathematics,35 study physics and 30 study chemistry.15 students are studying all the three subjects.How many students are studying exactly two of the subjects
  60. Chemistry

    In chemistry lab we did an experiment trying to find the empirical formula of an oxide and tin. The question is "suppose some of the oxide splattered out of the crucible. How would this affect your calculated ratio of the number of moles of oxygen to the number of moles of tin...
  61. Chemistry

    A 35g sample of Fe is dropped into 80g of water at 20 degrees Celsius. What is the final (equilibrium) temperature of the iron/water? This isn't really a chemistry problem. There will be no chemical reaction. It is a heat capacity (physics) problem. Use the specfic heats of ...
  62. chemistry

    The question I am having trouble with is: Scientists originally were uncertain whether the oxygen gas produced during photosynthesis came from CO2, H2O, or from both. How could radioisotope tracers be used to settle that question? Chemistry - DrBob222 6CO2 + 6H2O ==> ...
  63. Chemistry

    Ok i'm supposed to google these values for my teacher, but i can't get the answer im looking for...if you have them can you give them to me? Latice Energy for: Ammonium Nitrate and Calcium Chloride Hydration Energy for: Ammonium ion, Calcium Ion and Chloride ion Thanks I had ...
  64. chemistry

    Captain Kirk, of the Starship Enterprise, has been told by his superiors that only a chemist can be trusted with the combination to the safe containing the dilithium crystals that power the ship. The combination is the pH of Solution A described below, followed by the pH of ...
  65. Organic Chemistry

    Hello! I was looking for some advice on my organic chemistry lab. We were supposed to separate and identify a solid mixed into a liquid. I found and have confirmed my liquid is acetone by distilling it out of the solid. The solid then turned into a whitish powder while in the ...
  66. Chemistry

    I recently performed an experiment in which magnesium oxide formed. I have to find out the simplest whole number ratio of Mg atoms to O atoms. How do I go about doing this? * Chemistry - DrBob222, Tuesday, October 13, 2009 at 11:19pm Mass MgO - mass Mg initially = mass oxygen ...
  67. Chemistry

    Hi I was hoping to get some help on this. It's review for my chemistry text on Monday and I would be grateful if someone could help me out. My teacher has been out for two weeks but we still have to know this material. 1. The following data was collected for the reaction ...
  68. French (URGENT)

    Can someone please look over my "I am poem" and give suggestions? --------------------------------------------------------------------------------------------------------------------- Je suis une personne sur un voyage Je me le demande qu'est-ce que le signifier de vie J'...
  69. Psychology -- I need urgent help please

    The brain produces and exchange millions of neurotransmitters every hour. I need to support this because this is what I have written in my work and a student brought that up to my attention. Can someone help help support this with a source? I have been trying to find one ...
  70. CHemistry....Please help...DrBobb

    I posted this up yesterday: I have to use the equation : density= mass/ volume: But i don't know how to find out the volume using the edge length of the unit cell which is 5.88* 10^2 pm. CHemistry....Please help - DrBob222, Sunday, January 25, 2009 at 10:41pm If the edge ...
  71. Chemistry

    For a chemistry lab the experiment was to carry out an acid-base titration to determine the exact concentration of a sodium hydroxide solution. Two trials were completed and the data collected was: mass of weighing paper, mass of weighing paper + KHP, mass of KHP, initial ...
  72. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out first order and changes ...
  73. chemistry

    The half-life of a reaction was found to be inversely dependent on the concentration of the starting material. Thus, we can say that a. the reaction is zero order b. the reaction is first order c. the reaction is second order d. the reaction starts out first order and changes ...
  74. Chemistry

    A student finds a medallion which could be made of pure platinium or silver. IN order to find out what the medallion is made of the student takes the medallion to a chemistry lab. The student measures the density of the medallion as follows. The medallion is placed on a ...
  75. chemistry 12

    what is the relationship between ka and kb? Kw=ka*kb
  76. Chemistry

    How do you draw Al2 + O2
  77. chemistry

    is a element an atom?
  78. chemistry

    16 years = ? seconds
  79. chemistry

    what is the electron configuration for S?
  80. chemistry

    Cu(NO3)2 (aq) + H2O===> ?
  81. chemistry

    how many moles of x in 33.3g of substance?
  82. Chemistry

    5.000g / 2.5mL = ?
  83. chemistry

    Why isn't sucrose an electrolyte
  84. Chemistry

    THERE IS NOTHING WRONG WITH ME!!!!!!!!
  85. Chemistry

    what is the mass of a mole of M&M's? How do I do this?
  86. chemistry

    How many moles of Pb is 9.3 x 10^15 atoms of Pb?
  87. chemistry

    How to get the hybridization of N IN NO2- ?
  88. Chemistry

    I don't know how to solve for x in this equation.... 1.75 x 10^-5 = (x^2)/(0.10-x)
  89. chemistry

    why are volumes not additive?
  90. chemistry

    325*f to kelvin
  91. chemistry

    how to calculate persenteil
  92. chemistry

    what is the electron geometry of F^2, HF ?
  93. chemistry

    What is partial pressure?
  94. chemistry

    What is the pH, pOH and [OH-] of 0.06 mol/L HI(aq)?
  95. chemistry

    What amount is a mol?
  96. chemistry

    what is Hydrogen Bonding?
  97. chemistry

    how many moles are in Fe2O3
  98. chemistry

    how to draw 1,2 - diethyclyclohexane?
  99. chemistry

    convert 5.98 x 10 to the 24th kg. to mg.
  100. chemistry

    why is it good to be a csi
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