1. Chemistry

    Half reaction method of balancing redox reaction CHCl3 + MnO4- = Cl2 + CO2 + Mn+2
  2. Chemistry

    Al(s) + MnO2(s) → Al2O3(s) + Mn(s) When this reaction is balanced, how many electrons are transferred in each half-reaction? The answer I got is 3*2=6. Is this correct?
  3. Chemistry

    A certain reaction has an activation energy of 37.30 kj/mol. At what Kelvin temperature will the reaction proceed 3.00 times then it did at 303 k?
  4. CHEM

    How are the forward and reverse rate constants for a one-step reaction related to the equilibrium constant for the reaction? A)Kc = kf x kr B) Kc = kf - kr C) Kc = kf + kr D) Kc = kf/kr
  5. Inorganic chemistry

    The following reaction occurs spontaneously. 2H+(aq)+ca(s) Ca2+(aq)+H2(g) write the balanced reduction half-reaction
  6. chemistry

    Consider the following reaction. 2 CO (g) + O2 (g) −→ 2 CO2 (g) What is most likely true about the entropy change for this reaction? Why would the delta s of the rxn be less than zero? thanks.
  7. Chemistry

    The reaction N2(g)+3H2(g)<-->2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium the concentration of NH3 is 0.78 M. Determine the extent of reaction.
  8. Chemistry

    At a certain temperature, the reaction has Kc = 5 x 108. If a reaction mixture at equilibrium contains 0.26 M of H2 and 0.087 M of Cl2, what is the concentration of HCl?
  9. chemistry final step

    If you have 24.98 grams of P and 74.99 grams of O2, how many moles of each compound do you have present? so I got .805 of P (limiting) and 2.343 O2 (excess) how do i do this step ? If you have 24.98 grams of P and 74.99 grams of O2, how many moles of each compound do you have ...
  10. Chemistry

    Can you please someone check my answer for me? I don't know how to start thses answer. Chemistry is not my things. Please give me answers. :( a)Determine the number of grams in 0.750 moles of the compound Iron(II)phosphate: Fe3(PO4)2. Answer: ? b)How many atoms of iron are in ...
  11. Chemistry

    Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. F2 + 2e ---> 2F– B. O2 + 4H+ + 4e ---->2H2O C. 2H+ + 2e---> H2 D. Li+ + e ---> Li E. H2 + 2e --->2H i got C is that right?
  12. Chemistry

    What is the reaction between mno4- and c2o42- and is there a colour change in this reaction?
  13. Chem

    How us the speed of a chemical reaction related to the spontaneity of the reaction?
  14. chemistry

    A reaction has ÄH = -378 kJ and ÄS = -37 J/K. Calculate ÄG at 25°C to confirm that the reaction is spontaneous. in kJ
  15. chemistry

    what is the difference between acid base reaction and oxidation reaction
  16. chem

    Which reaction has been chosen as the 'standard' against which every other reaction is measured? A. Li+ + e– --> Li B. F2 + 2e– --> 2F– C. 2H+ + 2e– --> H2 D. O2 + 4H+ + 4e– ==> 2H2O E. H2 + 2e– ==> 2H
  17. science

    The reaction h2so4+naoh->bahso4+h20 is what reaction
  18. Chemistry

    consider the following reaction mechanism 2A+B->B+C B+D->E+C What is the rate law for step 2 of this reaction?
  19. Chemistry

    What is the chemical reaction for: The reaction of propanoic acid and 1-butanol
  20. Organic Chem

    What is the generic reaction equation for the Maillard reaction? Please help ^_^
  21. chemistry 2

    What does a negative E cell indicate about a redox reaction? What does is indicate about the reverse reaction?
  22. research

    what is the research problem discussed in the article: UNDER SURVEILLANCE: AN EMPIRICAL TEST OF THE EFFECTIVENESS AND CONSEQUENCES OF ELECTRONIC MONITORING? I have read this and I am totally lost. Please help
  23. statistics

    suppose that iq scores have a bell-shaped distribution with a mean of 97 and a standard deviation of 17. using the empirical rule, what percentage of iq scores are greater than 46? please do not round your answer.
  24. psychology

    To gain acceptance, ahypothesis must be: a. suggested by a credible authority. b. kept secret until the research is completed. c. imaginative and appealing. d. backed by empirical evidence. i choose the answer d is that correct. ASsp
  25. college math

    During the last hour, a telemarketer dialed 20 numbers and reached 4 busy signals, 3 answering machines, and 13 people. Use this information to determine the empirical probability that the next call will be answered in person.
  26. Chemistry

    Calculate the molar mass of a compound that raises the boiling point of water to 100.15oC when 40.5 g of the compound is dissovled in 500 g of water. and A mass of 41 g of an unknown nonelectrolyte is dissolved in 429 g naphthalene. The nonelectrolyte lowers naphthalene's ...
  27. science

    The primary source of energy in our solar sysem is from? a) fusion reaction on the sun b) fission reaction on the sun c) fission reaction on the earth d) fission and fusion in the galaxy e) fusion reactions in comets the answer i picked was a
  28. chemistry

    use the properties of sodium cyanide described above to deduce the type of bonding that holds this compound together, explaining in 1 or 2 short sentences how you arrived at your conclusions. Write a balanced chemical equation for the reaction that occurs when sodium cyanide ...
  29. chemistry

    A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound can be calculated to ...
  30. Math grade 12

    write the partial fraction decomposition of the following rational expression ( hint: binomial expansion with Pascal triangle can be used to expand binomials. technology may be used to solve large systems using matrices or determinants) 4 ------------------------------------- ...
  31. Chemistry

    An structural isomer of bromobutane (C4H9Br) can be hydrolysed using aqueous sodium hydroxide to produce butanol. This can be represented by the following equation: C4H9Br(l) + OH-(aq)  C4H9OH(l) + Br-(aq) This reaction was investigated experimentally and the following...
  32. Chemistry

    Which of the following is an example of a double-displacement reaction? AlCl3 + 3 NaOH → Al(OH)3 + 3 NaCl Na2O + H2O → 2 NaOH CuCO3 → CuO + CO2 None of the above are examples of double-displacement. A Which of the following is a double-displacement reaction? ...
  33. Chemistry

    Write rate law expressions? 2NOCl(g) --> 2NO(g) + Cl2(g) S2O3^2-(aq) + H^+(aq) --> HSO3^-(aq) + S(s) (Sulfur initially forms a colloid solution so it can be treated as aqueous.) (1) Write the rate law expression for the above reactions, assuming these are elementary. (2...
  34. chemistry

    A compound of nitrogen and oxygen is 36.8% nitrogen. A second compound of nitrogen and oxygen is 25.9% nitrogen. What is the ratio of masses of oxygen in the two compounds per gram of nitrogen?
  35. chemistry

    When the reaction is run in a buffer solution, however, it is pseudo-first-order in CH3I. rate = k[CH3] What is the half-life of this reaction in a pH 10.00 buffer if the pseudo-first-order rate constant for this reaction is 7.3 x10-9 s-1?
  36. chemistry

    For the electrolysis of molten potassium bromide: (a) write the equation for the reaction at cathode. (b) write the equation for the reaction at anode. (c) write the equation for the overall reaction.
  37. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) Delta G^o = 290.3 kJ/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous. What is the chemical ...
  38. chemistry

    Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g) = CO(g) + 3H2(g) In a particular reaction, 26.5 L of methane gas (measured at a pressure of 736 torr and a temperature of 25 C ) is ...
  39. CALCULUS

    3.Using the curve that you constructed for the decomposition of Carbon 14, find the age of a prehistoric cave painting discovered in the Lascaux Caves in southern France if the amount of Carbon 14 has decayed to 14.29%
  40. Chemistry

    The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after seconds have passed.
  41. chemistry

    Using each of the following equations, calculate the number total of moles of products that can be obtained through decomposition of 1.75 moles of the reactant? a. 2 NH4NO3---> 2 N2 + O2 + 4 H2O b. 2 NaClO3---> 2 NACl + 3 O2 answers are 6.12 and 4.38 but i don't ...
  42. science

    the decomposition of h2o2 is first order reation following up the decom position it was found that the remaining h2o2 after 45 min was 15 units from the original concentration57.5 unit calculate the rate constant
  43. Chemistry

    The decomposition of hydrogen iodide on a gold surface at 150 oC HI(g) ½ H2(g) + ½ I2(g) is zero order in HI with a rate constant of 1.20E-4 Ms-1. If the initial concentration of HI is 0.575 M, the concentration of HI will be 0.116 M after how many seconds have passed?
  44. Chemistry - help please

    The decomposition of NH4Cl can be accomplished by heating it in an evacuated cylinder. The products are NH3 and HCl gas. If the total pressure after heating is 4.4 atm, determine Kp. Please help me with the steps on how to do solve this.
  45. Chem

    What is PbCO3(s)-->PbO(s)+CO2(g) A. neutralization B. metathesis C. combustion D. decomposition E. combination Looks like the lead carbonate is decomposing to lead oxide and carbon dioxide to me. check my thinking.
  46. chemistry

    In a reaction vessel, the following reaction was carried out using 0.250 mol of NH3 and 0.100 mol of N2, 4NH3(l) + N2 (g) = 3N2H4 (l) what is the compositon in moles in the vessel when the reaction is completed? Is the answer: 0 mol NH3, 0.063 mol N2, and 0.188 mol N2H4?
  47. chemistry

    20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour appears, indicating that ...
  48. Chemistry

    Barium carbonate and nitric acid reacts in a double displacement reaction. One of products also dissociates and evolves carbon dioxide. Write the net ionic reaction including the proper use of phase labels for this solution run in aqueous solution. After this the following ...
  49. Chemistry

    For the reaction: 5A + 3B -> 6C + D, the following data is found: Time________A 0.00s .775 M 5.00s .200 M Find the rate of disappearance of A, the overall rate of reaction, and the reates of disapperance and appearance of B, C, and D. The answers I got were: Rate of ...
  50. physical science

    the influence of the magnitude of the surface area on the rate of reaction of a specific reaction using rennies tables
  51. chem.

    A certain reaction has an activation energy of 66.58 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 289 K
  52. chemistry

    How many liters of HCl are produced by the reaction of 5.7 L of hydrogen with an equal amount of chlorine? The reaction occurs at STP.
  53. Chemistry

    for a particular reaction H=-28.4 KJ and S=-87.9 J/K. Assuming these values change very little with temperture, over what temperature range is the reaction spontaneous in the forward direction?
  54. chemistry

    Al2O3+6HCl----->AlCl3+3H2O what type of reaction is this? -combination -decompisition -or double displacement reaction
  55. Chem

    A certain reaction has an activation energy of 66.58 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 289 K?
  56. chemistry

    The reactant concentration in a second-order reaction was 0.790 after 200 and 8.80×10−2 after 740 . What is the rate constant for this reaction?
  57. chemistry

    Explain why the rate of a simple chemical reaction such as NO(g)+1/2O2(g)=NO2(g) is likey to be most rapid at the beginning of the reaction.
  58. CHEMISTRY

    We have this reaction : HCO3- + OH- => CO3^-2 + H2O Specify the conjugate pairs and , which direction the reaction equilibrium shift ? and How ( as a rule ) ?
  59. chemistry

    2 HI(g) H2(g) + I2(g) The reaction above has an initial concentration of 2.00 M HI. (No other species are initially present.) If 22.4% of the HI has reacted when equilibrium is established, calculate Kc for the reaction.
  60. Chemistry

    Is there a reaction between Sodium Acetate and Copper (II) Nitrate. If so, what is the balanced equation for it? Also, what type of reaction is it does it form a precipitate?
  61. Chemistry - Rates

    For a particular reaction, the rate constant is 2.32 ✕ 10−3 M/s at 185°C and 3.70 ✕ 10−3 M/s at 235°C. What is the activation energy for this reaction? _______ kJ/mol
  62. Chemistry

    For the reaction HCONH2(g) --> <--NH3(g) + CO(g), Kc = 4.84 at 400 K. If delta H for this reaction is 29 kJ/mol, find Kc at 500 K. The answer is 27 I just don't know why.
  63. Chemistry

    A reaction yields 3.75 L of nitrogen monoxide. The Volume is measured at 19 *C and a pressure of 1.10 atm. What mass of NO was produced by the reaction?
  64. Chemistry

    the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction
  65. Chemistry

    A certain reaction has an activation energy of 58.80 kJ/mol. At what Kelvin temperature will the reaction proceed 6.50 times faster than it did at 303 K?
  66. Chemistry

    For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.
  67. chemistry

    The reaction x products follows Ist order kinetics in 40 minutes the concetration of x changes from 0.1M to 0.025M then the rate of reaction when conc of x is 0.01
  68. chemistry

    A certain reaction has an activation energy of 25.14 kJ/mol. At what Kelvin temperature will the reaction proceed 8.00 times faster than it did at 305 K?
  69. chemistry

    Which term has the same numerical value for the forward reaction as it has for the reverse reaction, but with opposite sign? a. ^E ( delta E) b. Ea1 c. Ea’ d. Ea2
  70. Science

    If the concentration of AgCl drops from 1.000 M to 0.655 M in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?
  71. chemistry

    A certain reaction has an activation energy of 27.34 kJ/mol. At what Kelvin temperature will the reaction proceed 3.50 times faster than it did at 335 K?
  72. Chemistry

    A gas-phase reaction has Kp = 2.44 × 10 20 at 25 ◦ C. Calculate ∆G 0 for this reaction. Answer in units of kJ/mol rxn
  73. Chemistry

    A certain reaction has an activation energy of 25.65 kJ/mol. At what Kelvin temperature will the reaction proceed 5.50 times faster than it did at 291 K?
  74. chemistry

    A certain reaction has an activation energy of 74.38 kJ/mol. At what Kelvin temperature will the reaction proceed 7.00 times faster than it did at 313 K?
  75. Kinetics Problem II

    The data below were collected for the following reaction: 2NO2 (g) + F2 (g) ->2NO2F(g) A: Calculate the value of the rate constant, k. B: What is the overall order of the reaction?
  76. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.
  77. chemistry

    True or False? An equilibrium constant K_c=1x10^7 for a reaction indicates that the reaction favors product formation.
  78. chemistry

    Explain the reaction mechanism of the following reaction by showing the types of bond splitting and atom rearrangements. C + O2 = CO2
  79. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.
  80. Chemistry

    Predict the products and write a net ionic reaction for the reaction of cadmium chloride and ammonium sulfide.
  81. Chemistry

    in a particular redox reaction, Cr is oxidized to CrO42- and Ag+ is reduced to Ag. Complete and balance the equation for this reaction in acidic solution.
  82. chemistry

    A certain reaction has an activation energy of 74.38 kJ/mol. At what Kelvin temperature will the reaction proceed 7.00 times faster than it did at 313 K?
  83. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.
  84. Science!

    1) Which of the following is true about photosynthesis? A. it is an exothermic reaction B. it is an endothermic reaction C. It produces carbon dioxide D. it occurs in animals I think it's A.
  85. chemistry

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this
  86. Chemistry

    Explain the reaction mechanism of the following reaction by showing the types of bond splitting and atom rearrangements. C + O2 = CO2
  87. Chemistry

    13) Mercury is an environmental pollutant because it can be converted by certain bacteria into the very poisonous substance dimethyl mercury, (CH3)2Hg. This compound ends up in the food chain and accumulates in the tissues of aquatic organisms, particularly fish, which renders...
  88. English

    Can you check if these sentences are simple, fragment, compound, or complex?: "Since the movie would last two hours, after dropping off the kids, mother decided to go shopping." Complex? "Kelly read The Plague as her summer novel." Simple? "Lawmakers frustrated with all the ...
  89. chemistry

    a compound containing 3 atoms of carbon and 8 atoms ofhydrgen is combined in a reaction with oxegyn molecules the two end products of this equation are carbon dioxide co 2 and water what elemement should i look at first in balancing this equation oxygen hydrgen carbon or ...
  90. Chemistry

    2 H2S (g) + SO2 (g) <===> ƒnƒn3 S (s) + 2 H2O (g) 1) At 298 K, the standard enthalpy change, H¢X, for the reaction represented below is -145 kilojoules. (a) Predict the sign of the standard entropy change, S¢X, for the reaction. Explain the basis foryour prediction...
  91. Chemistry; Stoichiometry

    Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess CuSO4? 1. 70.6 g 2. 57.2 g 3. 129 g 4. 31.4 g Consider the reaction 4As + 3O2 = 2 As 2O3 What is the ...
  92. Algebra

    Compare the graph of a compound inequality involving and with the graph of a compound inequality involving or.
  93. Chemistry

    7.77 g of rush (an oxide of iron) is heated until all the O2 atoms combine with charcoal. When this is done, a pellet of pure iron with a mass of 5.44 g remains. What is the empirical forumla for rust?
  94. chemistry

    Hi, Can someone please help??? looking for the empirical formula for Aliminium selenide if Se has a valency of -2 and aliminium 3! Thanks :) Wouldn't it be Al2Se3? Al is +3 and 3 x 2 = +6. Se is -2 and -2 x 3 = -6 And +6 - 6 = 0 and compounds must be zero. im lost!! hehe but ...
  95. chemistry

    A 2.000 g sample of magnesium was burned in air to form an oxide. After the product was purified it was found to have a mass of 3.317 g. What is the empirical formula for the product?
  96. ststistics

    A sample of 3000 observations has a mean of 86 and a standard deviation of 13. The distribution is bell-shaped. Using the empirical rule, find what percentage of the observations fall in the intervals
  97. Chemistry

    When 6.25grams of pure iron are allowed to react with oxygen, a black oxide forms. If the products weighs 8.15g, what is empirical formula of the oxide?
  98. general chemistry

    A 1.24g sample of a hydrocarbon, when completely burned in excess of O2(g), yields 4.04g CO2 and 1.24g H20. Determine the empirical formula.
  99. Chemistry

    A 0.400 gram sample of white powder contains 0.141 of potassium, 0.115 grams of sulfur, and 0.144 grams of oxygen. what is the empirical formula?
  100. science

    when a 424-g of iron powder is burned in an oxygen atmosphere, 0.606-g of a reddish brown oxide is obtained. Determine the empirical formula of the oxide.
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