CHEMISTRY (WEBWORK)

59,576 results, page 99

  1. CHEMISTRY plz help

    In the accompanying chart are appropriate vapor pressures for benzene and toluene at various temperatures: Temp (C) mmHg Temp (C) mmHg Benzene 30 120 Toluene 30 37 40 180 40 60 50 270 50 95 60 390 60 140 70 550 70 200 80 760 80 290 90 1010 90 405 100 1340 100 560 110 760 d. ...
  2. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and effective potato gun to ...
  3. Chemistry

    Suppose it is a hot summer day (40.0 degrees C = 104.0 degrees F), and you have left a can of hairspray outside so the gas within it is now at the same temperature of its surroundings. As part of your chemistry lab class, you have to build a safe and effective potato gun to ...
  4. chemistry

    what is the atomic number of ununhexium and the full symbol is this a transitional element that is a metal and what is its highest hydride and highest fluoride of ununhexium thanks What is known about Uuh can be found here. Look for element number 116. Go to www.webelelements....
  5. Ap Chemistry

    Posted by Jake on Sunday, September 23, 2007 at 1:08pm. My objective is to find the molar volume of a gas. Is this the correct balanced equation for magnesium ribbon reacting with hydrochloric acid to form hydrogen gas? 2Mg (s) + 2HCL (l) ----> H2 (g) + 2MgCl (aq) Also, I'm...
  6. chemistry - pick a polymer

    I need to pick a polymer for my science project. It has to be organic and preferably simple. Some that are already taken are: polyethene, polystyrene, PVC, polyacrylonitrile, DDT , nylon.. Thanks a lot it has been really hard for me to find something. I don't know if you must ...
  7. Chemistry

    Just having some trouble with this chemistry problem.. Thanks for help! Toxic carbon monoxide (CO) gas is produced when fossil fuels such as petroleum burn without enough oxygen. The CO can eventually be converted to CO2 in the atmosphere. Automobile catalytic converters are ...
  8. Chemistry

    What is the wavelenght of radiation of 1.50X1013Hz? The wave equation will find this: frequency*wavelength=speedoflight
  9. ChEMistry

    a binary compound between germanium and bromine would have a formula like: (a)
  10. Chemistry

    If you were to have a lewis dot structure, such as, C2H5OH, where is the O placed? Between a carbon and an H.
  11. chemistry

    addtional information: the diameter of the oil film on the water is 40cm^2 see my post.
  12. chemistry

    Hi, Can anyone please tell me how to convert cm3 into litres? Thanks ;) worked it out! Cheers ;)
  13. ap chemistry

    What is the concentration (in M) of hydronium ions in a solution at 25 degrees C with a pH = 4.282? i got 5.22 x 10^-5 ? right on the money.
  14. chemistry

    After your explanation I try to solve it, so would you please check my work again. Thank you! a)
  15. chemistry

    Please help me with this one. You are trying to dissolve oxygen in water. Will you be successful? Explain your answer.
  16. chemistry 2

    Which group from the periodic table contains two elements that exhibit +2 and +4 oxidation states? 1A, 2A, 3A, 4A, 5A, 6A OR 7A 4A. C, Sn, Pb That it 2A and 4A
  17. Chemistry

    Write a balanced chemical equation for the combustion of trioleylglycerol. The molecular formula is C57H110O6.
  18. Chemistry

    How many grams of calcium carbonate are consumed per 500 g of sulfur (IV) oxide? in what reaction?
  19. AP Chemistry

    Write a balanced chemical equation for the combustion of trioleylglycerol. molecular formula C57H110O6
  20. chemistry

    How many hydrogen atoms are ther in 18.00mg of water? 18.00 mg = 0.018 g. mols = g/molar mass.
  21. chemistry

    What is required to break covalent bonds in glucose? Im thinking of ATP and Enzymes but Im not sure.
  22. chemistry

    In a recrystallization of vanillin, can you purify a substance whose solubility decreases as the temperature increases?
  23. Chemistry

    What is the accepted value of the height of a molecule of oleic acid? I cannot find it to do my percent error.
  24. Science repost for help

    Sciece (chemistry) - help, Tuesday, September 25, 2007 at 4:32pm what is the particle theory
  25. Chemistry

    How many kilograms of chlorine are in 30kg of each of the following chlorofluorocarbons (CFC's)? CF2Cl2 -in kg's; CFCl3 -in kg's; C2F3Cl3 -in kg's?
  26. CHEMISTRY

    What experimental observations can support the theory that there is restricted rotation about double bonds?
  27. chemistry

    what happens when a hot empty coke can is put in a icy cold water ? what is the reaction?
  28. AP CHEMISTRY

    STATE THE HEISENBERG UNCERTAINTY PRINCIPLE AS IT RELATED TO THE DETERMINING THE POSITION AND MOMENTUM OF AN OBJECT.
  29. Chemistry - Solutions

    Do all solutes show an increase in solubility with increasing temperature? Explain.
  30. Chemistry - Solutions3

    Why do you think there is such a big difference in the solubility of different solids in water?
  31. Chemistry

    Which substance can not be decomposed by ordinary chemical means? how? 1. methane 2. mercury 3. ethanol 4. ammonia
  32. Chemistry

    How would you purify decanoic acid contaminated with biphenyl? what method and solvent.Please help me
  33. Chemistry

    What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.
  34. analytical chemistry

    What is the pH at the equivalence point in a titration between 0.4450 F NH3 and 0.1520 F HCl?
  35. chemistry

    for this reaction: 2NO + heat <-> N2 +O2 which way would the equillibrium shift if catalyst is added?
  36. chemistry

    Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
  37. chemistry

    Which of the following subshells is correctly designated? a. 1f5 b. 3s3 c. 6f12 d. 4d11 e. 1p2
  38. chemistry

    Using data from this chapter, calculate the change in energy expected for each of the following processes Rb(g) + Br(g) Rb+(g) + Br -(g)
  39. ap chemistry

    How can I calculate the exothermic lattice energy when all I am given is the compound formula LiF?
  40. Chemistry

    Which of the following molecules has polar bonds and is nonpolar? HF ICI3 NF3 SF4 BF3
  41. Chemistry

    All of the following are weak acids except HF H3PO4 H2SO4 HNO2 HC2H3O2
  42. chemistry

    what are the principles/techniques involved in double-indicator titration? especially in carbonate mixtures.
  43. Chemistry

    A solution of 100g of water contains 23 g of table salt. At what temperature will it begin to freeze?
  44. Chemistry

    What are the symbols of the family of elements that have seven electrons in their outermost energy level?
  45. Chemistry

    Hey, can you help me balance this equation? Cu2S + HNO3 --> Cu(NO3)2 + CuSO4 + NO2 +H2O Thanks!
  46. Chemistry

    I am trying to find tests physial/chemical to distinguish an aluminum and iron mixture.
  47. Chemistry

    What is the average mean of the following data set: 2, 8, 6, 4, 2, 4, 5 (round your answer to 2 decimal points)?
  48. chemistry

    which harmful gas is formed when coal and oils containing sulphur impurities are burned?
  49. Chemistry

    Number and arrangement of the electron pairs around: a. C in CCl4 b. S in H2S c. Al in AlH3 d. Ga in GaCl3
  50. Chemistry

    Number and arrangement of the electron pairs around: a. C in CCl4 b. S in H2S c. Al in AlH3 d. Ga in GaCl3
  51. Chemistry

    How would you prepare 455 g of aqueous solution that is 6.50% sodium sulfate Na2SO4 by mass?
  52. Chemistry

    Please explain the acitivty series of metals. How can i determine if one element displaces another?
  53. Chemistry

    Given the weight of phenacetin and its percentage yield...how would I calculate its melting point?
  54. chemistry

    state specifically how you would make a conclusive test for an iron (III) salt.
  55. organic chemistry

    Is it possible to reduce an aldehyde and a ketone at the same time with sodium borohydride?
  56. Chemistry

    What is the molecularity of each of the following elementary reactions? A. O+O2+N2----> O3+N2+ B. NO2Cl + Cl---> NO2 + Cl2 C. Cl + H2 ---> HCl + H D. CS2----> CS + S
  57. Chemistry

    A catalyst does not change the ______ of the reaction. a. mechanism b. enthalpy c. energy of activation d. rate
  58. chemistry

    how is the endpoint estimated using potentiometric if no chemical indicator is added to the analyte solution?
  59. chemistry

    What are the advantages of a gas as a coolant? (instead of heavy/normal water) (in a fission reactor)
  60. chemistry

    how do u calculate the density of an irregular shape? this is 1 of my hm/wk questuions n i wasn't listening...i mean i didn't hear what he said
  61. Chemistry HELP!

    What is the translating word equation for water decomposes to form hydrogen oxygen gases?
  62. Chemistry

    In the reaction KNaC4H4O6 + H2O + COCl2 * 6H2O ¨ what r the products? and is the tartrate ion the catalyst?
  63. Chemistry

    What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate? How do I start this problem
  64. chemistry

    I need help with this equation as soon a possible How many liters of NH are needed to react completely with 30.0 L of NO (at STP)?
  65. chemistry

    Does particle size have more or less of an effect on the rate of reaction than temperature?
  66. chemistry

    cloud has a pH of 2.0 rainfall has a pH of 5.5 how many times more acidic has the moisture been in the clouds? please help
  67. Chemistry

    ? g of glucose C6H12O6 must be dissolved in 400 g of water to give a solution that is 0.258 m.
  68. chemistry

    What is the orbital hybridization of the central atom S in SF4? 1) sp 2) sp3d 3) sp2 4) sp3d2 5) sp3
  69. chemistry

    The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?
  70. chemistry

    k we did a lab and i don't understnad how to do this part... Determine the heat absorbed by the solution, which raises its temp.
  71. chemistry

    I don't understand what this term means: "Vinegar must not be less than 4% by mass acetic acid."
  72. chemistry

    Calculate the current required to transfer 0.015 mols of electrons in a time of 20 min
  73. chemistry

    In what ways does the manufacture of a Hybris hybrid powered car use petroleum as a fuel?
  74. Chemistry

    How many grams of KF do you need to weigh in order to prepare 500. mL of solution with a concentration of 0.250 M?
  75. chemistry

    Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
  76. chemistry

    Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
  77. chemistry

    Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
  78. chemistry

    Suggest a type of reaction and the conditions required to breakdown polyamides into their monomers.
  79. chemistry

    The compound with the highest boiling point will be which of the following? A.CH3Cl B.CH3Br C.CH4 D.CH3F
  80. chemistry

    how can you tell how many valence electrons family 3 (transition metals) have? im confused about this.
  81. chemistry

    2K(s) . Cl2(g) KL 2KCl(s) Write the six possible mole ratios for this equation im so confused
  82. chemistry

    what will happen when potassium liliac colored flame is viewed through blue glass
  83. Chemistry

    A certain first-order reaction A--->B is 25% complete in 42 min at 25 degrees C. What is the rate constant?
  84. Organic chemistry

    Show all steps with reagents how you would synthesize propylbenzene from benzene.
  85. chemistry

    what is the balanced equation for the reaction that takes place between bromine and sodium iodide
  86. Chemistry

    The solubility of borax is directly proportional to temperature. Therefore, the sign of H is A. negative B. positive
  87. Chemistry

    I have a "connecting concepts"on the introduction to Matter worksheet to do, and I don't know how to go about doing it. Can someone please help?? Thanks
  88. chemistry

    a test liquid has a density of 1.1g/mL. when you pour some of it into a cup of water, what will happen?
  89. Chemistry

    Two hydrides A and B of an element X contain 17.76% and 12.58% by mass of hydrogen. Identify A and B and comment on their structures.
  90. Chemistry 2

    Can someone balance this equation for me? Ba(OH2)x 8H20+ NH4SCN--> Ba(SCN2)+ H20 + NH3 Thank you!
  91. chemistry

    if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?
  92. chemistry

    if the concentration of NO3- in the water is uniformly 5 microMolar, how many moles of N are there per square meter?
  93. ogarnic chemistry

    give one reason why we cannot reuse boiling stones after use?
  94. Chemistry

    Determine which H atom transition(iinitital, nfinal) was responsible for the absorption of a photon with a frequency of 4.57 x 10^14 Hz. [RH = 2.18 x 10^-18 J; h = 6.63 x 10^-34 J s]
  95. chemistry

    Write two conversion factors bsd on the relationship between hours and minutes...
  96. chemistry

    Write two conversion factors based on the relationship between hours and minutes...
  97. Chemistry

    Which of the follwing is NOT acidic? a. Milk b. saliva c. soft drinks d. blood I believe the answer is d
  98. chemistry

    how do i draw a particle model to describe the reaction between sulphur and iron in detail?
  99. Chemistry

    Why do gases behave in a less ideal manner when in LOW TEMP. AND HIGH PRESSURE?
  100. chemistry

    What preliminary test are you looking for to identify conclusively your unknown solutions as Set C? Explain
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