1. Chemistry

    Can you have one half-reaction take place, without the other half-reaction taking place immediately? The other half-reaction takes place when the cell potential is raised. I half witness this in some electrochemical cells. Sincere Thanks.
  2. Biology Help

    Enzymes: a. increase the amount of energy release in a reaction b. decrease the amount of energy release in a reaction c. catalyze only redox reactions d. reduce the activation energy needed to for a reaction I think its d. or a. Help Please
  3. Chemistry

    3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous? Explain. (1 point) b...
  4. Chemistry

    Which of the following can we predict from an equilibrium constant for a reaction? 1 The extent of a reaction 2 Whether the reaction is fast or slow 3 Whether a reaction is exothermic or endothermic a. 1 only b. 2 only c. 3 only d. 1 and 2 only e. 1 and 3 only 2. (Points: 1) ...
  5. L/A

    How do you form the perfect tense of a verb? A: Use the helping verb will and the base form of the word? B: Use a form of the verb be and the past participle of the verb? C: Use a form of the verb have and the present participle of the verb? D: Use a form of the verb have and ...
  6. English

    How does one cite from this form in APA form? I want to use something that would work for me but I don't know how to cite from this form. Please help.
  7. chemistry

    I have to draw the QMM of CL2C2. For the Lewis structure i think that the two C ayoms form a triple bond and the Cl atoms form single bonds. Therefore i think that the central C atom hybridizes into sp. if this is correct, my question is how do i know which p orbital on C to ...
  8. Local Standards And Regulations

    Sunny Smiles Day Care Center is organized as a partnership. Which one of the following business tax forms will the owners need to file 75 days after the close of the fiscal year? A. Form 990 B. Schedule C C. Form 1065 D. Form 1120 My answer is (A) can someone check my answer.
  9. chemistry

    Which of the following statements is true about the nucleus? Only the strong nuclear force holds the nucleus together. The strong nuclear force and the residual strong force hold the nucleus together. The presence of neutrons, the strong nuclear force, and the residual strong ...
  10. Science (Chemistry)

    A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...
  11. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 207.0 kg of PbS and 310 kg of PbO. Please help!!!
  12. Chemistry

    HELP!!! At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 487.0 kg of PbS and 750 kg of PbO.
  13. Chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 807.0 kg of PbS and 1210 kg of PbO
  14. Chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 220.0 kg of PbS and 330 kg of PbO.
  15. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 593.0 kg of PbS and 890 kg of PbO.
  16. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 887.0 kg of PbS and 1330 kg of PbO.
  17. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 887.0 kg of PbS and 1330 kg of PbO.
  18. chemistry

    How many electrons are transferred in the reaction of hydrogen peroxide with iron (II) ion in acidic solution to form iron (III) ion and water? i'm not sure if iposted this already... sorry if i did :) Fe^+2 ==> Fe^+3 + e 2e + 2H^+ + H2O2 ==> 2H2O Multiply equation 1 by ...
  19. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 553.0 kg of PbS and 830 kg of PbO.
  20. chemistry

    Doing review for an exam and I can't find how to do this problem in my notes. 2 SO2 + 2 Cl2 -----> 2 SOCl2 + O2 from a previous problem I solved: rate=k[SO2]^2[Cl2] k = 467.666666... or in sig. figs 467 Energy reaction: T= 25 C The activation energy (Ea) is 35.0kJ/mole ...
  21. chemistry

    Doing review for an exam and I can't find how to do this problem in my notes. 2 SO2 + 2 Cl2 -----> 2 SOCl2 + O2 from a previous problem I solved: rate=k[SO2]^2[Cl2] k = 467.666666... or in sig. figs 467 Energy reaction: T= 25 C The activation energy (Ea) is 35.0kJ/mole ...
  22. Chemistry due soon

    What is enthalpy? A. Enthalpy is the kinetic energy of a system. B. Enthalpy is the heat involved in a reaction. C. Enthalpy is the temperature of a reaction. D. Enthalpy is the mass involved in a reaction. I think the answer is a or b
  23. conditional sentence

    1. If the sound system hadn't failed,last night's show would have been better a. this is a correct sentence using the 1st conditional form b. this is correct sentence using the 2nd conditional form C. this is a correct sentence using the 3rd conditional form answer A 2. They'...
  24. Chemistry Need help ASAP

    A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining step? Explain why. (ii) It ...
  25. Chemistry Need help ASAP

    A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining step? Explain why. (ii) It ...
  26. Science

    An investigation was conducted to study the effect of the concentration of a reactant on the (trial) time need to complete a chemical reaction. Four trials of the same reaction were performed.In each trial the initial concertration of the reactant was different. The time ...
  27. Chemistry

    2A + 3B + C ⟶ D + E The rate constant for this reaction is 0.25, and the reaction is second order in A and is first order in B and C. Which option correctly gives the rate of the reaction if [A] is 0.4 M, [B] is 0.1 M and [C] is 0.2 M?
  28. chemistry

    The problem: Nitrogen can react with steam to form ammonia and nitrogen monoxide gas. A 20.0L sample of nitrogen at 173C and 772mmHg is made to react with an excess of steam. The products are collected at room temperature (25C) into an evacuated flask with a volume of 15.0 A. ...
  29. chemistry

    write the equations for the substitution reaction of methene with bromine under the following conditions. a) reaction in the presence of sunlight CH4+Br2 sunlight=? b) reaction in the absence of sunlight CH4+Br2 =?
  30. chemistry

    Equilibrium is established in a reversible reaction when: A)the [product] = [reactants] B)rate of reaction of products = rate of reaction of reactants C)all the reactants dissolve or dissociate D)products are no longer produced
  31. Chemistry/Equilibrium calculations

    At 1200 K, the approximate temperature of vehicle exhaust gases, Kp for the reaction 2CO2(g)-> <- 2CO(g)+ O2(g) is about 1 E-13. Assuming that the exhaust gas (total pressure 1 bar) contains 0.2% CO, 12% CO2 and 3% O2 by volume, is the system at equilibrium with respect ...
  32. Chemistry

    Tungsten metal can be produced by the reaction of tungsten oxide powder (WO3) with hydrogen gas (H2) in a reactor heated to 800oC. The by-product of the reaction is water vapor (H2O). The reactor is charged with 128.0 kg of WO3 and 41.0 kg of H2. Assume that the reaction goes ...
  33. Chemistry

    Could someone explain Le Chatelier's principle to me? Thanks Reactions tend to go to the direction that reduces stress: stress from pressure, temperature. If a reaction gives off heat (exothermic), it will go faster if temperature is reduced, ie, it is easier to give off heat ...
  34. Chemistry

    for the redox reaction given in the chemical equation Pb(OH)4^2- (aq) + ClO- (aq) --> PbO2 (s) + Cl- (aq) For the oxidation half reaction I got Pb(OH)4^2- (aq) --> PbO2 (s) + 2H2O (l) + 2e- For the reduction half reaction I got 2e- + 2H2O(l) + ClO-(aq) --> Cl- (aq) + ...
  35. Chemistry 101

    Write the reaction that occurs when sodium phosphate and barium chloride react. Be sure to include the phase labels. Then write the total ionic reaction and the net ionic reaction including proper phase labels.
  36. Chen=mistry

    Sodium metal reacts violently with water to form NaOH and release hydrogen gas. Suppose that 3.00 g of Na reacts completely with 3.00 L of water and the final volume of the system is 3 L. What is the molarity M of the NaOH Solution formed by the reaction?
  37. Chemistry

    Metallic aluminum reacts with MnO2 at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 67.2% mole percent Al. Find the theoretical yield (in grams) of manganese from the reaction of 240 g of this mixture.
  38. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water formed during this ...
  39. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water formed during this ...
  40. Chemistry

    In the following reaction, first find how many oxygen molecules would be used to completely react with 230 grams of pentyl alcohol (C5H11OH)? Then, if exactly 1.505x10^21 carbon dioxide molecules were formed in this reaction, calculate the grams of water formed during this ...
  41. Chemistry

    Reaction: C6H11OH(l) ==> C6H10(l) + H2O(l) Calculate the mass of cyclohexanol (C6H11OH) needed to produce 45.0g cyclohexene (C6H10) by reaction if the reaction has a 86.2% yield and the cyclohexanol is 92.3% pure. Usually this problem would be fairly easy, but the purity is...
  42. Chemistry (Check)

    Ammonia can be produced in a two-step process. First, nitrogen reacts with red-hot magnesium to form magnesium nitride. Then magnesium nitride reacts with water to form magnesium hydroxide and ammonia. A. Write each balanced chemical reaction. B. How many grams of magnesium ...
  43. Chemistry (Check)

    Ammonia can be produced in a two-step process. First, nitrogen reacts with red-hot magnesium to form magnesium nitride. Then magnesium nitride reacts with water to form magnesium hydroxide and ammonia. A. Write each balanced chemical reaction. B. How many grams of magnesium ...
  44. English

    1. The shop is two blocks away form this post office. 2. The bakery is at the corner one block away form the flower shop. 3. The ware house is between the two buildings one block away form the book shop. ------------------ Are they all grammatical? Would you check them? Thank ...
  45. science

    When carbon in the form of diamond is burned to produce CO2, more heat is given off than when carbon in the form of graphite is burned. What form of carbon is more stable under ordinary conditions? What bearing does this conclusion have on the origin of diamonds?
  46. Chemistry

    I need definitions for chemistry and I can't come up with any heterogeneous reaction homogeneous reaction activation energy activation energy activated complex elementary reaction
  47. chemistry

    The reaction of zinc and chlorine requires 0.00624 mol of Zn and 0.0125 mol of Cl to react exactly to form zinc chloride. What is the mole ratio of Zn to Cl? What is the empirical formula of zinc chloride?
  48. REACTION KINECTICS

    The autocatalytic reaction of A to form Q is one that accelerates with conversion. An example of this is shown below: A+Q~Q+Q However, the rate decreases at high conversion due to the depletion of reactant A. The liquid feed to the reactor contains 1 mol L-] of A and 0.1 mol L...
  49. chemistry

    Why are half-reactions used in redox reactions? A. They make it easier to keep track of spectator ions in the reaction. B. They make it easier to see the oxidation and reduction parts of the reaction separately. C. They make it possible to neglect the electrons that are being ...
  50. chemistry

    "Following the reaction of zinc with hydrochloric acid, a secondary reaction can occur if a product of the first reaction is ignited. Write the complete reactions for both reactions." "If 2.75g zinc with 0.15 moles HCL, how much flammable product can be collected?" I know one ...
  51. Chemistry

    Consider the following reaction between sulfur trioxide and water: SO3(g)+H2O(l)→H2SO4(aq) A chemist allows 61.5 g of SO3 and 11.2 g of H2O to react. When the reaction is finished, the chemist collects 51.0 g of H2SO4. Determine the percent yield for the reaction.
  52. Chemistry

    I know nothing about chemistry, but am wondering if someone could help me with these. 1) Balance this redox reaction using the oxidation-number method. Zn + O2 + HCl ® ZnCl2 + H2O 2) Balance this redox reaction using the half-reaction method. (basic solution) Zn + MnO4- ® Zn...
  53. Chemistry

    Could you explain in detail why a saponification reaction is considered to be the reverse of an esterification reaction.
  54. chemistry

    The reaction of 9.58 g of Carbon with excess O2 yields 8.90 g of CO2, what is the percent yield of this reaction?
  55. CHEMISTRY

    In electrolysis , which reaction does occur on the cathode , half oxidation reaction or reduction ?
  56. chemistry

    WHAT WOULD HAPPEN TO THE REACTION THAT PRODUCES AMMONIA IF WATER IS PRESENT IN THE REACTION MIXTURE?
  57. Chemistry

    What mass of N2O5 will result from the reaction of 6.0 mol of NO2 if there is a 61.2% yield in the reaction?
  58. science

    2KClO3 - 2KCl + 3O2 is formed ! now which kind of reaction is this ? and how can i say it is that particular reaction took place here?
  59. college

    For the reaction P4(s) + O2(g) = P4 O10(s) Identify the limiting reaction mixture conataining 1.00 mol each of P4 and O2
  60. chemistry

    Balance the following redox reaction using the half reaction method: NaIO3+KI==> I2+H20+Na(+1)+K(+1)
  61. chemistry

    For the reaction HCO3- H+ + CO32-, ΔG° = +59.0 kJ/mol at 298.15 K. Find the value of K for the reaction
  62. biochemistry

    I am studying for a midterm. Do you know this answer? what reaction does LDH actually catalize and why is that reaction important?
  63. Chemistry

    Assume the reaction of 55.25 g of Ge in the following reaction to determine the other quantities. 3Ge + 2N2 -> 1Ge3N4
  64. Chem II

    A first-order reaction is 35.5% complete in 4.90 minutes. The rate constant of the reaction is _____
  65. gr 12 chemistry

    write an equation for a reaction involving an aldehyde to illustrate a hydrogenation reaction.
  66. Chemistry

    Balance the redox reaction below using the half-reaction method. Bi3+(aq) + Co(s)Bi(s) + Co2+(aq)
  67. chemistry

    a first order reaction has a rate constant of 7.5 x 10^-3/s. The time required for th reaction to be 60% complete is
  68. Chemistry

    Explain, in terms of collision theory, how and why a reaction’s rate changes as the reaction progresses.
  69. Chem II

    The reaction A -->B---> C is called a _______ reaction? Consecutive parallel competing stepwise
  70. Chemistry

    For the following redox reaction, give the complete reduction half reaction. Na(s) + Al+3(aq) Na+1(aq) + Al(s) Please help asap!!
  71. Chemistry

    Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to make it conform to reality.
  72. college

    In acidic solution, nitrous oxide (N2O) reacts with potassium chromate (K2CrO4) to form Cr3+ (aq) and nitric oxide (NO), as products. (i) Produce balanced half-equations to represent the oxidation and the reduction steps. (ii) Generate a final balanced equation for the overall...
  73. Chemistry

    1. Pentane gas (C5H12) combusts with oxygen gas (O2) to form water (H2O) and carbon dioxide (CO2). Write a balanced chemical equation for this reaction and explain the scientific principle (statement) that requires the balancing of an equation to make it conform to reality
  74. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you
  75. chemistry

    for an exotherimic reaction incresing the reaction temperature results in a (n)___k ?
  76. chemistry

    balanced reaction for reaction between ferrous sulphate and nittric acid
  77. chemistry

    what is the oxidation half-reaction in the following chemical reaction? fe(s) + 3 agno3 -> ag + fe(no3)3
  78. Chem

    Why do the rate of reaction for a reversible reaction slows down at equilibrium stage.
  79. chemistry

    Given the reaction 1/2 N2( g) + 3/2 H2 (g) ___> NH3 (g) +11.0kcal.Is this reaction exothermic or endothermic?
  80. Chemistry

    Ok, so in an when an endothermic reaction occurs, is it hot or cold? and why? Also what is it for an exothermic reaction? Thank you
  81. science

    Given the following reaction, with Kp=1.05 at 250 degrees C what is Kc? The reaction is PCl5 to PCl3+Cl2
  82. Chemistry

    How does the activation energy of an uncatalyzed reaction compare with that of the catalyzed reaction?
  83. Chemistry

    Show that the reaction caco3 ->cao+co2 is not a redox reaction
  84. Chemistry

    What chemical compound is formed in the reaction when 6M HCl and 1M NaOH is reaction?
  85. chemistry

    What type of reaction would CO2 + H2O --> H2CO3 be I think it would be synthesis reaction?
  86. Chemistry

    X(g)+ 2Y(s) + 3Z(g) ⟶ 2L(g) + 4T(g) If this reaction occurs in one step, what is the order of this reaction? I am not even sure what this means. Could someone explain?
  87. Chemistry

    Since decomposition is an endergonic reaction. Does this mean it's reverse reaction synthesis is exothermic?
  88. Chemistry

    Show that the reaction caco3 ->cao+co2 is not a redox reaction
  89. chemistry

    state two ways of decresing the reaction rate of a gas phase chemical reaction.
  90. Chem12

    Calculate Kp for the reaction N2(g) + 3 H2(g)--> 2 NH3(g) given that the reaction has Kc = 438,880,639 at a temperature of 265.
  91. maths

    For the reaction given below, how many grams of Na2CS3 are produced in the reaction of 65.0 mL of liquid CS2 (d = 1.26 g/mL) and 1.56 mol NaOH?
  92. Chemistry

    If the reaction 2NO + 2H2 --> N2 + 2H2O occurred in just a single step, the overall order of the reaction would be A) 1 B) 2 C) 3 D) 4 E) 5
  93. chemistry

    alternative reaction for acrylic acid and analyzing reaction for finding gross profit
  94. Science

    The mass defect in a certain nuclear reaction is 0.108a.m.u.Determine the energy released in the reaction
  95. Chemistry

    Calculate the heat of reaction (ΔHrxn) for the following reaction: 5O2(g) + 4NH3(g) → 6H2O(g) + 4NO(g)
  96. Chemistry

    The rate constant for a second-order reaction is 0.54 M-1s-1. What is the half-life of this reaction if the initial concentration is 0.27 M
  97. Chemistry

    Kp for the following reaction is 0.16 at 25°C. 2 NOBr(g) (reverse reaction arrow-> <-) 2 NO(g) + Br2(g) What happens when you decrease and increase volume?
  98. Chemistry

    Write the reduction half reaction for the redox reaction below. ClO-(aq) + I-(aq) => Cl-(aq) + I2(s) Is I- being reduced since Cl is losing an O?
  99. chemistry

    what do you observe in the displacement reaction of zinc and lead nitrate? also, what is the symbol equation for this reaction?
  100. chemistry

    what are the reaction steps of the reaction between ferric chloride with hydrogen at 600 degree celsius
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