chemistry! URGENT

61,261 results, page 29

  1. Chemistry, pH

    What is the (OH-) when pH = 4.25
  2. chemistry

    what is the
  3. chemistry

    3.5g
  4. Chemistry

    1.0 x 10^5 mL=m^3
  5. chemistry

    how many g/ml are there in 1M?
  6. chemistry

    thanks!
  7. Chemistry

    How
  8. Chemistry

    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. A) Using C6H12O6 for sugar, calculate ÄH of fermentation and of respiration(combustion). B) Write a...
  9. chemistry

    Strychnine, C21H22N2)2(aq) is a weak base but a powerful poison. Calculate the pH of a 0.001 mol/L solution of strychnine. The Kb of strychnine is 1.0 x 10^-6 DrBob222, I am planning on obtaining a pHD in about nine years:P Can you give me some advice on how to be that 1% of ...
  10. Chemistry

    For chemistry I am supposed to convert 0.001 348 grams to milligrams. I know how to convert grams to milligrams, but I don't get what's with the 0.001. Does this mean it should be .348 grams to milligrams (multiplying by .001??) Thanks
  11. CHEM

    What is the exact method/formula used to calculate oxidation state #'s? & how does one know when to use the correct oxidation state #? For example: Carbon carries 4,2,-4; Cl= 1,5,7,-1; and, Mn=2,3,4,7. Thanx. You use the seven rules in your text. Assigning of the oxidation ...
  12. Chemistry

    E=hv E=energy h= Planck's constant =6.626 x 10^-34 v= frequency 1. What is the energy of light having a frequency of 2.28 x 10^12? ( I do have an answer for this but I'm not so sure about it.) 2.What is the energy of light with a wavelength of 2.18 x 10^-5? 3. A photon of ...
  13. Chemistry

    H6P7: Young's Modulus Rank the following 3 classes of materials in order of increasing typical Young's Modulus: metals such as copper, plastics such as HDPE (high density polyethelene), and ceramics such as alumina (Al2O3). Do not look up the values of Young's Modulus, instead...
  14. Chemistry

    Thank you for your help. I did want to clarify why you are only calculating the Molar Mass for H2 and not the molar mass for H2O (or even H2O2). I'm not sure why you did this. Please clarify. See below: The following reaction represents the decomposition of hydrogen peroxide ...
  15. chemistry

    home / study / questions and answers / science / chemistry / a chemical engineer studying the properties of ... Question A chemical engineer studying the properties of fuels placed 1.760 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas The bomb was ...
  16. chemistry

    I have two solutions of 0.1 Molar. A solution of magnesium chloride and a solution of potassium chloride. I thought that the 0.1 M solution of magnesium chloride would conduct electricity better than a 0.1 M solution of potassium chloride. I did a lab in my chemistry class but...
  17. Chemistry

    Hi Dr. Bob, this is a chemistry question. I don't know how to go about solving this problem: What is the pH of the solution created by combining 11.40 mL of the 0.10 M NaOH(aq)with 8.00 mL of the 0.10 M HC2H3O2(aq)? Here's what I have so far: (0.10M NaOH)(0.0114L)= 0.00114 mol...
  18. VERY URGENT, HELP!

    Consider a simple economy consisting of only four firms. Firm A, a mining enterprise, extracts iron ore. Firm B, a Steelmaker, produces steel sheets. Firm C, a carmaker, makes automobile while Firm D produces automobile tires. In 2016, firm A extracts 50,000 tons of ores, ...
  19. Econ URGENT HELP!

    Consider a simple economy consisting of only four firms. Firm A, a mining enterprise, extracts iron ore. Firm B, a Steelmaker, produces steel sheets. Firm C, a carmaker, makes automobile while Firm D produces automobile tires. In 2016, firm A extracts 50,000 tons of ores, ...
  20. Chemistry

    I did a lab for Organic Chemistry I did a simple distillation for an unknown and found that it boiled at 76 degrees. I also found out that the unknown was ethanol since we knew what the 4 possibilities were and mine was closest to ethanol. I also did a fractional distillation ...
  21. Chemistry

    A cup of teat containing 400g of liquid at 20 degrees celsius was heated. If 58.5 kj of heat was absorbed by the tea, what would the final temperature be? Assume that the specific heat of the tea is the same as that of water (4.18). I am not sure how to start this problem. ...
  22. Chemistry

    The term mole is used in chemistry to define an amount of a substance. For example, a mole of glucose, blood sugar, weighs 180.16 grams. A common concentration unit for solutions is moles of substance per liter of solution. We abbreviate this with the symbol M. For example, 0....
  23. Econ VERY URGENT, HELP!

    Consider a simple economy consisting of only four firms. Firm A, a mining enterprise, extracts iron ore. Firm B, a Steelmaker, produces steel sheets. Firm C, a carmaker, makes automobile while Firm D produces automobile tires. In 2016, firm A extracts 50,000 tons of ores, ...
  24. Majoooooor Help please please help me

    Please can you give me what are the products , the colour of the flame, how does it react when : 1- Zinc reacting with oxygen Zinc reacting with air 2- Iron filings with oxygen Iron filings with air 3- Copper reacting with oxygen Copper reacting with air 4- Magnesuim reacting ...
  25. Chemistry Lab

    In chemistry we are doing a lab that involves crucibles and Mg ribbon, we have three days to complete the lab. Anyways do you think it would be alright to substitute the mass of the crucible we had the first day with the mass of the crucible we had today? We know how much the ...
  26. Chemistry *DrBob222

    Posted by Jamie on Sunday, June 20, 2010 at 3:36pm. You are given three test tubes that contain colourless liquid. One test tube contains benzene, another contains ethanol, and the third contains 2,4-hexadiene. Design a procedure that will tell you the contents of each test ...
  27. Chemistry

    I need serious help with 3 different chemistry problems: 1. If coal is assumed to be all carbon, carbon has a molecular weight of 12 lb-mass/lb-mol, and oxgyen (diatomic) has a molecular weight of 32 lb-mass/lb-mol, how much carbon dioxide (lb-mass/day) is produced in 171.4 lb...
  28. Chemistry

    Indicate how each of the following would affect the value of the absorbance (too high, too low, or not effect) of the indicated solution. I really need help. I do not understand these questions! This is from a chemistry activity to determine the unknown concentration of an ...
  29. chemistry

    I'm having trouble naming this organic chemistry compound. (I'm not sure how to include a picture in this, so I'll try my best to explain it in words and attempt to type it out) The full formula is C9H16. It's an alkyne and the longest carbon chain is 5 carbons long, so I know...
  30. Chemistry II

    What is the ^S for NaCl (l)?
  31. MTI

    what is chemistry
  32. chemistry

    what is a pi bond?
  33. Chemistry

    How do i solve [A]=[A]0 x e^-kt for k
  34. chemistry

    reinforcement??????????????????? help
  35. Chemistry

    What does "Kc" mean?
  36. Chemistry

    what is the pH of a 0.10 M NH3???
  37. chemistry

    what is the pH of a 0.10 M HC2H3O2
  38. chemistry

    How does pH = 8.75 give (H^+) = 1.77 x 10^-9.
  39. chemistry

    How does pH = 8.75 give (H^+) = 1.77 x 10^-9
  40. science

    chemistry help
  41. chemistry

    1000 mm = how many km
  42. chemistry

    .001 Ml= how many mL
  43. chemistry

    what's malleability
  44. CHEMISTRY

    10-g what does it mean?
  45. chemistry

    what is a compuond?
  46. chemistry

    what is an atom
  47. chemistry

    what is AL(MnO4)3
  48. chemistry

    What is iron
  49. chemistry

    what is mmHg?
  50. chemistry

    1.00 mole H2
  51. AP Chemistry

    Which value of Ke
  52. chemistry

    0.600 mL= L
  53. chemistry

    0.600 mL= L
  54. chemistry

    Al is the symbol for
  55. chemistry

    How many moles are there in 23.6g Ag?
  56. Chemistry

    What is C2H5OH?
  57. chemistry

    what is Ph of [H+] = 0.00010M?
  58. chemistry

    What is sulute
  59. chemistry

    what is the oxidation no of I3-
  60. chemistry

    Fe+O2+H2o - ??????????/
  61. chemistry

    what is the pH of 0.15 M NaF?
  62. chemistry

    28.06 mL to grams
  63. chemistry

    how to simplify (x 3-x)/(x-1)?
  64. chemistry

    how to simplify ((x^3)-x)/(x-1)
  65. chemistry

    what are isotopes???
  66. chemistry

    Ba Ba2+
  67. Chemistry

    What is a enantiomer?
  68. chemistry

    2 NO(g) + 1 O2(g) <==> 2 NO2(g)
  69. chemistry

    What is H+(aq) + –OH(aq) H2O(l)
  70. chemistry

    what is fe+s+hcl=
  71. Chemistry

    Find the Ph: of 7.01 x 10-5 M Ba(OH)2 thanks:)
  72. chemistry

    What is the pH of 6.6 X 10^4 M HCL?
  73. chemistry

    compare
  74. chemistry

    comparetheentrophybetweenco2gch4g
  75. chemistry

    S2(s)+H2(g)=H2S(g)
  76. Chemistry

    If 1 mg = 10^-3g and 1 Mg = 10^6g, how many milligrams are there in 0.25 Mg?
  77. chemistry

    WHAT IS HS2SO4
  78. chemistry

    WHat is a precipitate?
  79. chemistry

    44:65f
  80. chemistry

    44:65f
  81. Chemistry

    How do you convert 25.0 mg/mL to cc?
  82. chemistry

    what is saponication
  83. chemistry

    1228g/l to g/ml
  84. chemistry

    2L of 6M HCl
  85. Chemistry

    [H^+] = 2.7 x 10^-3 Calculate for [OH^-] [OH^-] = ? M
  86. chemistry

    Your percent
  87. Chemistry

    How do you get the pH 13.68 into OH^-^?
  88. chemistry

    Fe + K2CO3
  89. chemistry

    saADFFF
  90. Chemistry

    28g
  91. chemistry

    2.35*10^-4M,,Mg(OH)2 what is the pH of this solution
  92. chemistry

    AuCI,(aq)+Ca(s)=
  93. Chemistry

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

    6.04g
  95. chemistry

    what is mass
  96. chemistry

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

    yrjtukj
  98. chemistry

    what is a positron
  99. chemistry

    wh at is prtoplam
  100. chemistry

    what is cryogenetics
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