1. Science

    Equal Masses of phosphorus and chlorine react according to the follow equation. 2P+3Cl2=2PCl3 Which reagent is in excess and what percentage of it will remain at the end of the reaction
  2. science

    chemical reaction in cells that needs oxygen to release energy and produce carbon dioxide and water as waste 1)breathing 2)exhaling c)inhaling d)respiration
  3. Chemistry

    The rate constant for this first-order reaction is 0.440 s-1 at 400 C. A to products How long in seconds would it take for concentration of A to decrease from 0.740 M 0.290 M?
  4. chemistry

    Consider the following unbalanced reaction: Fe2O3 (s) + CO (g) --> Fe (s) + CO2 (g) How many moles of carbon dioxide are produced per mole of iron (III) oxide reacted.
  5. chemistry

    Calculate the mass of NO2 produced from the decomposition of copper nitrate if .462mol of oxygen are formed. The equation for the reaction is 2Cu(no3)2 - 2CuO + 4NO2 +O2
  6. Science (urgent)

    Hi I really need to know this I've asked a couple times but haven't gotten an answer yet. In the reaction X + Y ® Z, Z is the A) substrate. B) product. C) enzyme. D) carbon molecule.
  7. chemistry

    What products are formed when aqueous solutions of Na2SO4, Fe3SO42, and BaCl2 are mixed together ? Can someone help me write out a balanced equation for the reaction that occurs.
  8. Chemistry

    Calculate the number of mL of hydrogen gas at 27 degrees Celsius and 640 Torr produced by the reaction of 0.520 grams of magnesium with excess hydrochloric acid.
  9. chemistry

    The rate constant for this first-order reaction is 0.320 s–1 at 400 °C. A--> Products How long (in seconds) would it take for the concentration of A to decrease from 0.830 M to 0.220 M?
  10. Chemistry

    What volume of hydrogen gas measured at 27celcius and 723 torr may be prepared by the reaction of 8.88 grams of gallium with an excess of hydrochloric acid? Ga+ HCl ==> GaCl3 + H2
  11. Chemistry

    Calculate how many grams of the product(s) would be produced by complete reaction of 0.125 mole of the first reactant. CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
  12. Chemistry

    What is the total volume of gases produced at 819 K and 1. atm pressure when 320 g of ammonium nitrite undergoes the following decomposition reaction? NH4NO2 --------> N2(g) + 2H2O(g)
  13. World History

    Generally peasants and the lower castes had a more positive reaction to the teachings of the Buddha, since Buddhists did not support the concept of a ________.
  14. Chemistry

    Balance the following equations for a half reaction that occurs in a acidic solution A) ClO3- --> Cl2 B)H2BO3- -->BH4- C) MnO4- + HNO2 -->NO3- +Mn2+
  15. Chemistry

    Equal masses of P and Cl react according to the following equation: 2P + 3Cl2 --> 2PCl3 Identify which reagent is in excess. Calculate the percent that will remain at the end of the reaction.
  16. Chemistry

    Right, for the reaction of hot sodium hydroxide plus chlorine , how come one of the products are 5NaCl and not Na5Cl seeing as we now know the oxidation state of cl is -5
  17. Chemistry

    Is the Conversion of NO2 to HNO3 endo- or exothemic? Calculate the enthalpy and free energy change for the reaction 4NO2 + o2 + 2H2O-----> 4HNO3 in the aqueous phase.
  18. Chemistry

    Is the Conversion of NO2 to HNO3 endo- or exothemic? Calculate the enthalpy and free energy change for the reaction 4NO2 + o2 + 2H2O-----> 4HNO3 in the aqueous phase.
  19. Chemistry

    What mass (g) of water is produced by the combustion of 48.8 g of propane according to the following reaction? Round your answer to one decimal place. C3H8(g) + 5 O2(g) --> 3 CO2(g) + 4 H2O (l)
  20. General Chemistry

    The value of delta H for the reaction below is -6536 kJ. ____kJ of heat released in the combutsion of 16.0g of C6H6. 2C6H6(l) + 15O2(g) yield 12CO2(g) + 6H2O
  21. chemistry

    the reaction is......CaCO3+2HCl---->CO2+H2O+CaCl2. what mass of HCl will be neutralized by 0.50g ofCaCO3? How do i figure this out in a non-complicated way??
  22. Chemisty

    The value of ∆Ho for the reaction below is -1107 kJ: 2Ba(s) + O2(g) → 2BaO(s) How many kJ of heat are released when 15.75 g of Ba(s) reacts completely with oxygen to form BaO(s)? A) 35.1 B) 114 C) 70.3 D) 20.8 E) 63.5
  23. chemistry

    what is the geometry of the molecular compound formed by the reaction of sulfur with hydrogen? linear angular trigonal planar tetrahedral please explain the correct answer
  24. CHEMISTRY

    If an explanation for correct answer could be provided, that would be great! Which equilibrium constant indicates that the reaction will produce mostly products? a. Kc = 3.46x10-6 b. Kc = 1.96x10+7 c. Kc = 0.319 d. Kc = 0.37
  25. Chemistry

    Under acidic conditions, MnO4− becomes Mn2+. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)
  26. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here. Cr+Ni(2+) ->Cr(2+) + Ni
  27. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
  28. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
  29. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.763 M and [Sn2 ] = 0.0180 M Mg(s)+Sn^2+(aq)-->Mg^(2+)+Sn(s) I keep getting 2.57 but it says I'm wrong. Please help me!
  30. Chemistry

    Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Mg2 ] = 0.763 M and [Sn2 ] = 0.0180 M Mg(s)+Sn^2+(aq)-->Mg^(2+)+Sn(s) I keep getting 2.57 but it says I'm wrong. Please help me!
  31. chemistry

    A sample of 1.15g of lead (II) nitrate is mixed with 121mL of 0.104 M sodium sulfate solution. Part A Write the chemical equation for the reaction that occurs.
  32. Chemistry

    Predict and draw the structure of the product of the reaction of the following substrates with the given reducing agent. 2-hexanone mixed with hexanoic acid with (i) NaBH4 (ii) LiAlH4
  33. Chemistry

    Use bond energy values to estimate delta H fro the following reaction in the gas phase: C2H4 + Br2 -> CH2BrCH2Br I am in dire need of help! Thank you
  34. Chemistry

    Complete the Bronsted- Lowry reaction, placing each product by its appropriate label. HCO3^-+HNO2 (double arrows) need a spot for acid and for base.
  35. Chrmistry

    How many grams of hydrogen gas be produced from the reaction of 3 g of magnesium with 4 g of hydrochloric acid. identify the limiting in excess reactants. Please help btw that's the exact question.
  36. Chemistry

    Calculate the mass of water formed by the complete reaction of 572 g of propane (C3H8) with excess oxygen. (Write a balanced equation.) Answer in units of g.
  37. Chemistry 2

    Does the reaction P4(s, white) + 5 O2(g) P4O10(s) occur spontaneously at 298 K and standard state conditions? Calculate the value of capital delta S°univ. Honestly do not know where to start.
  38. chemistry

    Can aluminum (Al) react with K2SO4 by single replacement to yield products? Using the activity series chart, I know that K is more reactive than Al so does that mean that a reaction will occur or not?
  39. Chemistry

    consider the reaction at 298K. 2H2S(eq) + SO2-----3S(s) + 2H2O (g). Calculate Grxn under these conditions. PH2S=2atm Pso2 =1.5 atm PH2O + 0.01atm
  40. Biology ( Ms.Sue help)

    Which one of the following reactions occurs in the cristae of the mitochondria?    A. The prep reaction   B. Glycolysis   C. The electron transport chain   D. The citric acid cycle   B?
  41. University of Papua New Guinea

    Give equations with reaction conditions to show direct esterification methods for the production of A) isopropyl butanoate B) ethyl- 2-methylpropanoate
  42. chemistry

    Mno4- + So3-2 = Mno2 + sO4-2 (in neutral solution,but H+ ions will appear in the final question) solve this redox reaction and give me the method also Thank you
  43. chemistry

    Determine how much heat (in kilojoules) is evolved or absorbed in the reaction of 1.05 g of Na with H2O: 2Na(s)+2H2O(l) →2NaOH(aq)+H2(g),ΔH∘=−368.4 kJ
  44. chemistry

    For the oxidation- reduction reaction equation given here, 2Na+S -> Na2S indicate how many electrons are transferred in the formation of one formula unit of produce.
  45. Physics

    An object of mass 10kg is placed on an inclined plane at 30 degree to the horizontal. Calculate the reaction between two surface and what is the coefficient of static friction.
  46. science

    write balanced equation showing the reaction occurs when lead is added to a solution containing a mixture of aqueous silver nitrate and copper(ii)sulfate
  47. Chemistry

    write a balanced nuclear equation for the reaction that occurs when uranium-335 absorbs a neutron and undergoes fission to produce 3 neutrons, bromine-65 and another nucleus.
  48. chemistry

    consider equilibrium equation below `Mg(NO3)2(aq) + 2Na(OH)(aq) <--> Mg(OH)2(s) + 2NaNO3 (aq) If NH3 is added, according to Le Chatelier's Principle, which way would reaction shift?
  49. Chemistry

    Consider the reaction: 2CH4(g) + 3O2(g) + 2NH3(g) --> 2HCN(g) + 6H2O(g) If 203.5 g NH3 is reacted with excess CH4 and O2, what mass in grams of HCN can be produced?
  50. Chemistry

    Consider the following unbalanced reaction: Fe2O3 (s) + CO (g) --> Fe (s) + CO2 (g) How many moles of carbon dioxide are produced per mole of iron (III) oxide reacted?
  51. pre-ap chemistry

    HOW MANY GRAMS OF OCTANE WOULD BE NEEDED TO RELEASE 3,500 kJ OF HEAT? 2C8H18 + 25O2-----> 16CO2 + 18H2O DeltaH= -5,530 kJ/mole of reaction
  52. Chemistry

    Nitrogen reacts with powdered aluminum according to the reaction: 2Al(s)+N2(g)→2AlN(s) How many liters of N2 gas, measured at 892 torr and 98 ∘C, are required to completely react with 17.8 g of Al?
  53. strength of materials

    Bar BC in the figure has length L, constant cross sectional area A, and is composed of a homogeneous material with modulus E. The bar is fixed between walls at B (x=0) and C (x = L). The bar is subjected to a variable distributed load per unit length, oriented in the direction...
  54. chemistry

    At 500 K in the presence of a copper surface, ethanol decomposesaccording to the following equation. C2H5OH(g) CH3CHO(g) + H2(g) The pressure of C2H5OH was measured as afunction of time and the following data were obtained. Time (s) PC2H5OH(torr) 0 250. 100. 237 200. 224 300. ...
  55. Chemistry

    Give the enthalpy change and entropy change values shown below calculate the free energy change for this reaction at 25 degrees C using Gibbs free energy equation. How does this value compare to the free energy change using the standard free energy of formation data? delta H=-...
  56. Chemistry

    Calculate the concentrations of all species present in a 0.33 M solution of ethylammonium chloride (C2H5NH3Cl). Okay so i tried doing HA = H + A ice table regular it doesnt work idk what Ka to use. b/c of the chloride. i have to find [C2H5NH2][H+][OH -][C2H5NH3+][Cl -]
  57. chemistry

    Sodium (Na) metal undergoes a chemical reaction with chlorine (Cl) gas to yield sodium Cl, or common table salt. If 1.00 g of sodium reacts with 1.54 g of chlorine, 2.54 g of sodium chloride is formed and 17.9 kJ of heat is released. How much sodium and how much chlorine is ...
  58. Chemistry- URGENT please HELP

    NH4NO3(s)+H2O(l)→NH4NO3(aq) ΔH = +25.7 kJ. What is the final temperature in a squeezed cold pack that contains 49.0g of NH4NO3 dissolved in 125 mL of water? Assume a specific heat of 4.18J/(g⋅∘C) for the solution, an initial temperature of 28.5∘C, ...
  59. Physics

    You have a brass ring of inside diameter 10.00 cm that is at 20.0oC. You want to slip this ring over an aluminum rod that is at 20.0oC and has a diameter of 10.01 cm. a. To what temperature do you have to heat the ring to slip it over the rod? b. Once you have the ring over ...
  60. organic chemistry

    Describe and explain how each of the following experimental errors or variations might affect your results. (a) you failed to dry the reaction flask after washing it with water. (b) you forgot to add the sulfuric acid. (c) you used twice the amount of acetic acid specified in ...
  61. chemistry

    It's hydrogen carbonate, which is HCO3- Should the reactant be H2CO3? How do you balance this reaction?: HCO3 ---> H2O + CO2
  62. Chemistry

    What is the NET IONIC EQUATION for the reaction of magnesium nitrate solution with silver sulfate solution. Is it AG2S04
  63. Chemistry

    for the reaction 2Na(s) + Cl2(g) -> 2NaCl(s), how many grams of NaCl could be produced from 103g of Na and 13L of Cl2 (at STP)
  64. Chemistry

    For the reaction 2Zn plus O2>> 2ZnO, how many grams of zinc oxide can be produced from 100.g each of zinc and oxygen?
  65. chemistry

    How many milliliters of 3.6 M HCl must be transfered from a reagent bottle to provide 20 g HCl for a reaction? Answer in units of mL
  66. psychology

    a defense mechanism is an unconscious reaction used to protect the mind? true or false ,true right
  67. Chemistry

    Ca + F2 --> CaF2 The mass of CaF2 that results from the reaction of 3.00 g of calcium and 2.00 g of fluorine is 4.02 g. What is the percent yield? (Atomic weights: Ca = 40.08, F = 19.00).
  68. Chem

    What determines whether 2-bromobutane undergoes an Sn1 or an Sn2 reaction how would you favor SN2 formation?
  69. Chemistry

    2C(s)+H2(g)+227.4kJ -> C2H2(g) is an endothermic reaction. If 682.2 kilojoules are absorbed, how many moles of C2H2(g) are produced?
  70. Chemistry

    Once it is balanced, in the following chemical reaction NaHCO3(s) Na2O(g) + CO2(g) + H2O(l), what is the coefficient for Na2O (s)? a. 1 b. 2 c. 3 d. 4
  71. science

    Which of the following would be the limiting reagent in the reaction shown below? There are 50 molecules of O2 and 50 molecules of H2. 2H2(g) + O2(g) ==> 2H2O(g)
  72. Organic Chemistry 1

    write a step-by-step mechanism for the reaction of 1-butanol with sodium bromide and sulfuric acid.
  73. organic chemistry

    if sodium iodoacetate is used instead of sodium chloroacetate, how will the rate of reaction be affected? explain.
  74. Chemistry

    Compute the equilibrium constant for the reaction between Ni 2+ (aq) and Co (s). I'm not sure how to work out this problem. Could you please help me out? thanks.
  75. Chemistry

    True or False? The amount of energy needed to form an activated complex is known as the activation energy of a reaction.
  76. chemistry

    Would the reaction of NaOH and HCl be arrhenius, bronsted-lowry, or lewis? What about NaOH and H2SO4?
  77. Chem

    Why does the reaction of (Z)-butenedioic acid (fumaric acid) with 1,3-cyclopentadiene give only one product? I don't know where to start. Thanks.
  78. chem

    What mass of copper(II) nitrate would be produced from the complete reaction of 25.1 g of copper my final answer is 74.08 is this correct
  79. chemistry

    Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate
  80. chemistry

    for the reaction, NaOH+HCl yield H20 + NaCl how is the rule that tells us Na goes with Cl and OH with H? Why does NaCl does not dissociate
  81. Chemistry--help me, please

    how would you separate Fe3+ from Ba2+ in a mixture? Please explain and give an equation for reaction.
  82. chemistry

    Wrtie the equilibrium constant expression for the reaction of NH3 with water. the OH- concentration of .050 M ammonia, NH3, is 9.5 x 10^-4 M
  83. chemistry

    what mass of phosphine oxide, is produced by the reaction of 15.0 g phosphine, 8.0 L oxygen at 25 degrees celcious and 755 mmHg
  84. chemistry

    At STP, what is the volume of HBr that will result from the reaction of 10 liters of H2 and 10 liters of Br2? Work would be nice :]
  85. Chem II

    For the reaction H2+I2, Kc=55.3 at 700K. In a 2. L flask containing an equilibrium mixture of three gases, there are .056g H2 and 4.36 g I2. What is the mass of the I2 in the flask?
  86. chemistry

    What mass of melamine, C3N3(NH2)3, will be obtained from 159.5 kg of urea, CO(NH2)2, if the yield of the overall reaction is 79.0 %?
  87. Chemistry

    Give the molecular, complete ionic, and net ionic equations for the reaction of ammonia with hydrochloric acid.
  88. chemistry

    what products would be formed if glycerol were combusted? wright a balanced equation for the combuntion reaction of glycerol (C3,H8,O3).
  89. chemistry

    By using the bond enthalpies and bond energies in thermochemical equations to calculate the reaction enthalpy of; H + Br=2HBr
  90. chemistry

    Given the reaction of hydrogen and chlorine gases, calculate the moles of hydrogen that react to produce 4.20 mol
  91. Chemistry

    Please help me solve this problem: What is the value of the equilibrium constant (K) for the reaction below 25^o C? 3I2(s) + 2Fe(s) --> 2Fe^3+(aq) + 6I^-
  92. chemistry

    How many milliliters of 1.4 M HCl must be transfered from a reagent bottle to provide 23 g HCl for a reaction? Answer in units of mL
  93. Chem

    How many milliliters of 1.5 M HCl must be transfered from a reagent bottle to provide 25 g HCl for a reaction? Answer in units of mL.
  94. Chemistry

    How many milliliters of 5.2 M HCl must be transfered from a reagent bottle to provide 22 g HCl for a reaction? Answer in units of mL
  95. chem

    calculate standard heats THE following REACTION : (H3C)3COH+HBr-----> (H3C)3CBr+H20
  96. Chem

    A lake may be polluted with Pb2+ ions. what precipitation reaction might you use to test for the presense of Pb2+?
  97. Ap Chem

    Why is it possible for Kp to be less than Kc? If this is the case then when Kc>1 it favors products, but if Kp <1 than how can that reaction favor products? Or does that rule only apply for Kc
  98. Ap Chem

    Why is it possible for Kp to be less than Kc? If this is the case then when Kc>1 it favors products, but if Kp <1 than how can that reaction favor products? Or does that rule only apply for Kc
  99. Science

    what is the net ionic equation for: Mn+Ni(NO3)2 -> Mn(NO3)2+Ni Is the answer no reaction or is Nickel considered a state change??
  100. Chemistry

    In this reaction, 4.58 L of O2 were formed at 745mm Hg and 308 K. How many grams of Ag2O decomposed. 2 Ag2O----> 4 Ag + O2 Please help I'm very confused
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