1. Chemistry II

    C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341
  2. Pre-calculus- URGENT

    Convert the rectangular coordinate (-8,i (square root of 3) into polar coordinates. How do I do this?? I tried every way I knew of to convert the y coordinate (i (square root of three)) to polar form, but it didn't work. I think that the polar form of the
  3. chem

    "The percentage of sodium hydrogen carbonate, NaHCO3, in a powder for stomach upsets is found by titrating .275 M hydrochloric acid. if 15.5 mL of hydrochloric acid is required to react with .500 g of the sample, what is the percentage of sodium hydrogen
  4. Science

    Humidity is the amount of water vapor in the air at a given time. At warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air
  5. CHEM

    1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent? 2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2. What is the limiting reagent? 3. The
  6. math(adding mixed fractions)

    please help me with (addition mixed fractions)i cant get it!!! ---addition with mixed numbers--- 1.which of the following is not true for adding mixed numbers? A.the denominators of the fractions must be the same in order to add them. B.you can add mixed
  7. Ms. Sue PLZ HELP!!!(Civics)

    "Four score and seven years ago our fathers brought forth on this continent, a new nation, continent in Liberty, and dedicated to the preposition that all men are created equal." -Abraham Lincoln With which of the following statements is the author of the
  8. chemistry

    What ions separate once added to water and how did the reaction occur?
  9. chemistry

    what mass of H2(g) is produced from the reaction of 5.2g Fe(s) with excess hydrochloric acid?
  10. chemistry

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

    What is the balanced equation for reaction between hydrochloric acid and water?
  12. chemistry

    how can AgCl(s) be dissolved completely? write an equation for the reaction
  13. chemistery

    what is the chemical reaction for the equilibrium that the haber process manipulates
  14. reading

    Describe Ralph's physical features and also his reaction to being on the island
  15. ap chem

    What volume of 5M HF will 4g Ca react completely according to the reaction Ca+2HF-->O+CaF2+H2
  16. chemistry

    what type of reaction is 2KCLO3+heat-2KCL+3O2
  17. Chemistry

    how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?
  18. kumar

    The addition of a catalyst during a chemial reaction alters which of the following quantities?
  19. chemistry

    What ions separate once added to water and how did the reaction occur?
  20. chemistry

    What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)?
  21. Chemistry

    Why does sulfric acid make the electrolysis reaction of H2 and O2 go more rapidly?
  22. Chemistry

    Write the equation for the reaction of mixing 2 ml of 3 M (HO)2SO2 with 9 ml of 0.2 M NaClO4
  23. science

    In the reaction X+Y (R) Z, Z is the A)Substrate B)Product C)Enzyme D)Carbon Molecule
  24. CHEMISTRY

    WHICH IS LIMITING REAGENT IN FOLLOEING REACTION 3Mg +N2 =Mg3N2
  25. chemistry

    write the equation for the reaction of mixing 4 ml of 3 M (ho)2so2 with 7 ml of 0.2 M naclo4
  26. Science

    In the reaction X+Y (R) Z, Z is the A)Substrate B)Product C)Enzyme D)Carbon Molecule
  27. chemistry (ap)

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  28. English

    Contrat the reaction of Hamlet, Laertes to their father's death.
  29. CHEMISTRY

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  30. science

    How far does your automobile travel in meters during your reaction time if you are moving at 55 mi/h (25 m/s)?
  31. Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H
  32. chemistry

    What ions separate once added to water and how did the reaction occur?
  33. chemistry

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

    What is the energy released in the fusion reaction: 2H+2H--> 4He + Q? How do I calculate this?
  35. Chemistry

    Balance Redox using reactions by the 1/2 reaction method. NaIO3 (aq) + KI (aq) -->„³ I2 (s)
  36. biology

    does dark reaction helps in transmittance and conservation of energy
  37. chemistry

    write the balanced half reaction for the conversion of Cl2(g)to Cl-(aq)
  38. Chemistry

    The half life for a first order reaction is know to be 4.5 h. How long will it take for 85% to be decomposed, in h?
  39. chem

    What functional group(s) must be present in a monomer of a condensation reaction.
  40. Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H
  41. Physical science

    What did svante arrhenius discover about the reaction between an Acid and a Base?
  42. science

    write the balaced half-reaction for the conversion of Fe(s) to Fe2+(aq)
  43. PHYSICS

    What reaction occurs between hydrogen and helium which gives the heat and of the sun
  44. electrochemistry gr 12

    Will there be a reaction is a magnesium strip is placed in a solution containing Ca2+ ions?
  45. chemistry

    what is a double replacement precipitation reaction and limiting reactants
  46. Chemistry

    Write the equation for the reaction of mixing 2 ml of 3 M (HO)2SO2 with 9 ml of 0.2 M NaClO4
  47. History

    What was king george's reaction to the boston tea party?
  48. SCIENCE

    CO+H2O ---->CO2+H2 IN THIS REACTION HOW TO I HAVE TO CANAVART CARBONIC ACID?
  49. chemisrty

    What is ΔGo at 1000 oC for the following reaction? CaCO3 (s) CaO (s) + CO2 (g)
  50. Chemistry

    Hello, Is there a reaction when NaNO3 is added to some H2O? Or does it just dissolves? Please explain why, thanks!
  51. chemistry

    What functional group(s) must be present in a monomer of a condensation reaction?
  52. chemistry

    What functional group(s) must be present in a monomer of a condensation reaction?
  53. Chemistry

    For the reaction 2 N2O O2 + 2 N2 what happens to the equilibrium position if the pressure is increased
  54. chemastrey

    of exhow many grams of no2 can be produced by the reaction of excess o2 with 19.8 of no
  55. chemistry prt 3

    What is the net ionic equation of the reaction of MgSO4 with NaOH
  56. Chemistry Check

    Which one of the following substances is the product of this combination reaction? Al(s) + I2(s) => ______ For this it would be AlI3 ?
  57. Chemistry

    When We Balance Equations In Chemical Reaction,we Are Obeying The Law Of
  58. chemistry

    ferus amonium sulphate reaction with sulphuric acid
  59. Chemistry

    Given the following reaction at equilibrium, if Kc = 1.90 x 1019 at 25.0 °C, Kp = __________. H2 (g) + Br2 (g) ↔ 2 HBr (g)
  60. Gen Chem

    Can the rate of a nuclear reaction be changed by an increase of temperature?
  61. Chemistry

    Write the Kc expression for the following reaction: Fe3+ + SCN- = FeSCN2+
  62. Nuclear Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H
  63. chem

    what mass of Cl2 is produced from the reaction of 665 g of Hal
  64. Chemistry

    AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l)
  65. chem

    What does it mean when the sulfuric acid in a chemical reaction is written ABOVE the arrow?
  66. CHEMISTRY

    How many oxidation states Should a substance have at least to undergo Disproportionation reaction ? thanks
  67. science

    writing balanced chemical reaction of K2CO3 (s) with HCl (aq)??
  68. Chemistry

    Writing balanced chemical reaction of K2CO3 (s) and HCl (aq) ???
  69. chemistry

    C+HNO3=H2CO3+H2O+NO2 which type of reaction is it.
  70. chemistry

    what amount of ethanol is needed for combustion reaction for a 20 oz bottle?
  71. chemistry again

    how do you find the concentration of an ion remaining after a reaction is complete???
  72. chemistry

    here is a redox reaction Fe+ Cu2+„³ Fe2+ Cu Is Fe oxidized and Cu reduced ? and why. Thanks for the help:)
  73. Chemistry

    What is the balanced equation for the reaction of 3.000 g of K2CO3 and HCl?
  74. science

    what substance is being reduced in the following redox reaction? HgCl2 + Sn^2 = Sn^4 + Hg2Cl2 + Cl-
  75. Declaration of Independence

    What were the colonists reaction/actions to the new ideas about natural rights?
  76. Chem

    Is this reaction endothermic or exothermic? Ca(C2H3O2)2(s) = Ca2+(aq) + 2C2H3O2-(aq)
  77. chemistry

    Kp for the reaction is 1.47 at 727°S CO2(g) + C(s) 2CO(g) Calculate Kc at this temperature
  78. chemistry prt 2

    What is the net ionic equation of the reaction of MgCl2 with NaOH
  79. Science

    In the reaction X+Y (R) Z, Z is the A)Substrate B)Product C)Enzyme D)Carbon Molecule
  80. wvuit

    calculate the enthalpy change for the reaction n2h4(l) + 02(g) --> n2(g) + 2h20(l)
  81. chemistry

    The "REVERSIBLE" chemical reaction- A + B C + D Kc = CD / AB =4.4 Concentration at the start and after equilibrium- A = 1.00 M --> (1.00 - X) M B = 2.00 M --> (2.00 - X) M C = 0.00 M --> X M D = 0.00 M --> X M 4.4 = X^2 / (1.00-X)(2.00 - X) I'm not sure
  82. Chemistry

    what is the equation for the reaction of Cu(NH3)subscript2(SO4) with NaOH?
  83. chemistry

    If a car produces 88g of CO2, how many grams of O2 are used up in the reaction?
  84. science

    what is the difference between a chemical reaction ans physical separation.
  85. Chemistry

    How many atoms of iron will be produced from the reaction of 50 g of hematite and 25 g of carbon?
  86. bio

    How is the oxygen production in 30 seconds related to the rate of the reaction?
  87. chemistry

    Balance the following redox reaction. MnO4 (aq) + Fe (s) --> Mn2+ (aq) +Fe2+ (aq)
  88. Chemistry

    What is the possible ionic equation of TrisEDTA solution? REDOX reaction.
  89. Chemistry

    N2 + 3H2 --> 2NH3 how many grams of ammonia is produced in the reaction?
  90. Chemistry

    How do I identify the reducing agent in a reaction of magnesium with oxygen?
  91. Science help please, thanks!

    Can you maybe give me two examples for action-reaction forces? I'm curious. Thanks!
  92. chemistry

    Why would methanol be used to halt a secondary alcohol and catalyst reaction?
  93. chemistry

    Why would methanol be used to halt a secondary alcohol and catalyst reaction?
  94. chem101

    will the following reaction take place nh3+h2o= nh2 + h3o
  95. chemistry

    What element is undergoing reduction in the following reaction? Zn(s) + AgNO3(aq) --> Zn(NO3)2 + 2 Ag(s)
  96. chemistry

    is it possible to have an acid/base reaction and produce a precipitate as a product as well?
  97. 7th grade chemistry

    how is potassium sulfate prepared?explain with chemical reaction.
  98. science

    explain the Eutectic and Eutectoid reaction in cast irons
  99. Organic Chemistry 2

    What is the purpose of adding NaOH ot the reaction? This is the from our Benzil Lab.
  100. Chemistry

    2C10H22 + 31O2 = 20Co2 + 22H2O What kind of reaction is this?