1. Chemistry

    I have 3NaBH4 + 4BF3.Et2O to form 2B2H6 th number of moles of NaBH4 is 0.0368mol and the number of moles of BF3.Et2O is 0.0162mol accoring to the ratio of reaction 3:4 the limiting reactant is BF3.Et2O so its the one used to find number of moles of
  2. Gen Chem

    At elevated temperatures, solid silicon reacts with chlorine gas to form gaseous SiCl4. At some temperature, the equilibrium constant for this reaction is 0.30. If the reaction is started with 0.10 mol of SiCl4 in a one-liter flask, how much Cl2 will be
  3. chemistry

    Need some help. have the A part of the question but do not know how to set B or C. Butadiene (C4H6) reacts with itself to form a dimer with the formula C8H12. The reaction is second order in butadiene. If the rate constant at a particular temp is 0.04/(M
  4. chemistry

    3HgO→2Hg+O2 Which of the following can definitely be concluded from the equation and heat of reaction above? A. The reaction is spontaneous. B. The reaction is non-spontaneous. C. The reaction is endothermic. D. The reaction is exothermic. E. None of
  5. chem

    Check the correct statements for the above reaction. Choose at least one answer. a. The reaction is exothermic. b. The reaction is endothermic. c. The change in entropy is positive. d. The change in entropy is negative. e. The reaction is at equilibrium.
  6. Chemistry

    Aluminum oxide is formed by reaction of excess oxygen with aluminum. 4 Al(s) + 3 O2(g) -> 2 Al2O3(s) Calculate the mass of aluminum required to form 18.2 kg of aluminum oxide if the reaction has a percent yield of 83.4%.
  7. Physics

    In fusion reaction two light nuclie fuse together to form one heavy nucleus.. We know like charges repel each other then how it's possible for the nuclie to fuse 2gether. 2. How is energy released during fusion reaction.a
  8. Chem.

    10. Suggest how two very different variables could be manipulated to increase the percent yield of sulphur trioxide. The equation for the reaction follows. 2 SO2(g) + O2(g)>>> 2 SO3(g) + energy Ok, I really don't know this one. Can you please
  9. ~Chem

    I was looing over this question and the answer I got was not correct, I noticed that somone already posted this question up before but maybe if I provide the answer I could get an understanding of the steps. @462degrees the reaction heat + 2NOCl <=>
  10. chemistry

    For the reactions that occurred spontaneously in the individual tables, balance these reactions assuming they are in an acidic solution. Reaction 1: Cu I^- Ag Br^- Reaction 2: Zn Pb Cu Ag Reaction 3: Cl2 Br2 I2 Reaction 1 I 2(aq) Cu2 + (aq) Ag + (aq) Br2
  11. Chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2 . The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor
  12. biology

    The primary reaction catalyzed by catalase is the decomposition of hydrogen peroxide to form water and oxygen, which occurs spontaneously, but not at a very rapid rate. Write a balanced equation for this reaction. (Remember that catalase is not a reactant
  13. chemistry

    Write the balanced equation for the reaction of aqueous Pb(ClO3)2 with aqueous NaI. Include phases. What mass of precipitate will form if 1.50 L of highly concentrated Pb(ClO3)2 is mixed with 0.350 L of 0.290 M NaI? Assume the reaction goes to completion.
  14. Chemistry - Science (Dr. Bob222)

    Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g)  N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were produced in the gaseous
  15. chem help!

    Which statement is true about a reaction at equilibrium? A. The reaction is not reversible. B. The reaction concentrations of the reactants and products are always equal. C. The reaction rates of the forward and reverse reaction are always equal. D. The
  16. science

    When Q < K, what can you conclude about the reaction? A. The reaction is not yet at equilibrium, and the reaction will proceed in the forward direction. B. The reaction is not yet at equilibrium, but the direction of the reaction must be experimentally
  17. 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
  18. Chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 8.591x10-3 M-1s-1. What is the initial rate of reaction in a reactor filled
  19. BIOCHEMISTRY

    Mark each statment that is true or false and give reasons. you will get credit only if your reasoning is correct a) at a steady state of an enzyme catalyzed reaction, there is not net change in [S] or [P] b) the linear anomer of beta-glucose is the more
  20. Chemistry

    35. In a calorimeter, the energy content of a substance is calculated from a measure of the temperature change in a known mass of a. iron b. air c. water d. steel C? 36. A decrease in the reactant concentration, per unit time, in a reaction is a measure of
  21. 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 am not quite sure what the reaction is, but if you are going from Fe(2+) to Fe(3+), the Fe is losing one
  22. Music

    What musical form preceded the sonata-allegro form, and is the sonata-allegro form still being used today? Sup' Christy, I beleive the form that preceed the sonata-allegro form would be the "minuet and trio" form. Symphonies are where you can find the s-a
  23. chemistry

    Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form
  24. chemistry

    Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base
  25. chemistry

    Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base
  26. chemistry

    Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base
  27. chemistry

    Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base
  28. Biology

    Synthesis means the process by which simple compounds are united to form more complex materials. Dehydration means loss of water. Explain why chemists refer to the joining of monosaccharide molecules to form disacchardies as dehydration synthesis reaction
  29. Chemistry

    Did I do these right? Can someone let me know if I did them correctly? I had someone help me with the problems but know I want to make sure their the right answers? 1. Methane burns in oxygen according to the following equation: CH4 + 2O2 ----> CO2 +
  30. science

    A + B -----> C is an example of a A) double-displacement reaction B) synthesis reaction C) single-displacement reaction D) redox reaction E) decomposition reaction
  31. Chemistry

    What type of reaction is involved in the making of Polypropylene? Would it be a synthesis reaction? The final step is a polymerization reaction. Before that, the propylene (C3H6) is made in a cracking reaction from heavier hydrocarbons. Thank you. :)
  32. chemistry

    State whether each of the following will increase,decrease or unchange when catalyst is added to the reaction and give an explanation for your answer please a) rate of reaction b)activation energy c)reaction enthalpy d)equilibrium of reaction
  33. College Chem

    4. Write the balanced equation for CH4+Cl2„_CH2Cl2+HCl6. For the reaction in problem 4, Heat of Reaction = -118.3 kcal/mol. Identify whether this is an exothermic or endothermic reaction. Calculate the Heat of Reaction when 6.00 g of Cl2 are used in the
  34. chemistry

    Elemental zinc will react with acid to evolve hydrogen gas. This is a redox reaction. Write a balanced molecular equation for the reaction of zinc and hydrochloric acid, showing the coefficents and the phases of all reactants and products. Below is an
  35. Chemistry

    Cyclopropane reacts to form propene in the gas phase. The reaction is first order in cylclopropane and has a rate constant of at 485 . If a 2.5 reaction vessel initially contains 724 of cyclopropane at 485 , how long will it take for the partial pressure
  36. chemistry

    calcium hydroxide reacts in a neutralization reaction with sulfuric acid in a 1:1 ratio to form water and calcium sulfate. if you have 23.5 grams of calcium hydroxide, how many milliliters of water can you form? how do i use dimensional analysis to solve
  37. Chemistry

    1. Hydrogen gas combines with oxygen gas to yield water. if 15 g O2 is present in the reaction, compute how much water will be produced. 2. Ten (10)grams methane gas combines with oxygen gas to form water and carbon dioxide. How much water is produced from
  38. Chemistry

    What is the formula of the precipitate formed from the precipitation reaction of Pb(NO3)2 and NaI? QUESTION 2 When aqueous solutions of (NH4)3PO4 and KOH are mixed, what precipitate(s) will form? K3PO4 NH4OH no precipitate will form NH4OH and K3PO4
  39. Chemistry

    AgNO3 + NaCl -> AgCl + NaNO3 Which statement about this reaction is FALSE? A. This is one kind of metathesis reaction, where molecules exchange atoms. B. This reaction produces a gas. C. This is a precipitation reaction. D. The equation is balanced.
  40. Chemistry

    Which statement about this reaction is FALSE? AgNO3 + NaCl -> AgCl + NaNO3 A. This is one kind of metathesis reaction, where molecules exchange atoms. B. This reaction produces a gas. C. This is a precipitation reaction. D. The equation is balanced
  41. CHemistry

    The first step of the synthesis is described by the reaction below. When 1.200 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4, the theoretical yield of FeC2O42H2O is ? grams im not sure what to do. do u convert 1.0M to grams first? by
  42. Biology

    Okay so if i have two enzyme catalyzed reactions: 1) delta g of the ES = -22kJ/mol 2) delta g od the ES = 42 kJ/mol Is this first reaction going to have a higher reaction rate because the of the negative delta g, because doesnt a negative delta g give you
  43. complete and balnces theses reactions

    how do i complete and balnces theses reactions???? CH3-CH2-CH3 (g) + Br2 (l) --> like how in the world????? do i do this? lol aint got a clue wish i would have listened at school now. Alkanes usually react with a halogen to form one of several halides.
  44. (11) Chemistry - Science (Dr. Bob222)

    In the following hypothetical reaction A + B → C + D, the equilibrium constant, Keq is less than 1.0 at 25°C and decreases by 35% on changing the temperature to 45°C. What must be true according to this information? A. The ΔH° for the
  45. Chemistry

    A 2.50 gram sample of bronze was dissolved in sulfuric acid. The copper in the sample reacted with sulfuric acid to form copper sulfate. Cu (s) +2 H2SO4 (aq) -> CuSO4 (aq) +2 H2O (l) The copper sulfate formed in this reaction was mixed with I to form
  46. basic math

    An education fund allocates RM10,000 to help 100 students from form three, form five and form six in a school. Each form three student receives RM80, each form five student receives RM120 and each form six student receives RM160. The number of form three
  47. chemistry

    Consider the following reaction: 2HBr(g)---> H_2(g) + Br_2(g) B)In the first 15.0s of this reaction, the concentration of HBr dropped from 0.510M to 0.455M. Calculate the average rate of the reaction in this time interval. C)If the volume of the
  48. Chemistry

    A reaction of hydrolysis of Ba(NO) in a net ionic form?
  49. chemistry

    reaction between iron fillings and su lphur will form
  50. Chemistry

    I'm working with a reaction of the form: A + B -> C Problem: IF the equilibrium constant is 4.2 and an equimolar mixture of A + B are reacted, verify that there will be an equilibrium yield of 67%. Here is my attempt thus far. 4.2 = [C] / ([A]*[B]) x =
  51. Chemistry

    In an aluminum calorimeter, 25.00 g of I2 was burned in excess H2 to form HI. From the data below, establish the molar heat of reaction and write a thermochemical reaction. Data: Mass I2 25.00 g Mass Al 70.00 g Specific heat Al 0.900 J/gC Volume water
  52. Chemistry

    A 1.009-g mixture of the solid salts Na2SO4 (molar mass=142.04g/mol) and Pb(NO3)2 (molar mass=331.20g/mol). The precipitate was filtered and dried, and it mass was determined to be 0.471 g. The limiting reactant was determined to be Na2SO4. a. write the
  53. Chemistry

    an exothermic reaction involves a. breaking weak bonds to form weak bonds. b. breaking weaker bonds to form stronger bonds c. breaking srtong bonds to form strong bonds. d. breaking stronger bonds to form weaker bonds. I think that it is a.
  54. help help help chemistry

    why will no one answer this question? For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction
  55. Chemistry

    What would be the product of the reaction of 4-methyl pyridine with Ac2O/AcOH and PhCHO? I'm really stuck on this. I'm guessing the pyridine will attack the anhydride and form an acyl pyridinium ion but I'm not sure where to go from there. If that reacts
  56. ap chemistry

    some reactions that are considered to be spontaneous at low temperatures will not proceed at a measurable rate or form any measurable quantity of products for several hours, days, or years. a. explain why this is. b. will the addition of a catalyst alter
  57. Chem18

    Coal can be used to generate hydrogen gas by this endothermic reaction: C(s) + H2O(g) CO(g) + H2(g) If this reaction is at equilibrium, which of these stresses would increase the formation of hydrogen gas? (choose ALL of the possible answers - there may be
  58. CHEMISTRY..

    1. Will a precipitate form if solutions of potassium sulfate and barium nitrate are combined? If so, write the net ionic equation for the reaction. 2. Will a precipitate form if solutions of potassium nitrate and magnesium sulfate are combined? If so,
  59. chem

    PLEEEZE help name the type of reaction K + MgBr -> Not enough information is provided. And not magnesium bromide is MgBr2. Is this a solution phase or exactly how is the K metal added to the MgBr2? As DrBob has indicated, not all of the information has
  60. AP Chemistry (repost)

    some reactions that are considered to be spontaneous at low temperatures will not proceed at a measurable rate or form any measurable quantity of products for several hours, days, or years. a. explain why this is. b. will the addition of a catalyst alter
  61. Chemistory

    The reaction has an equilibrium constant of = 0.154. If 6.60 of , 4.30 of , and 11.60 of are added to a reaction vessel with a volume of 5.30 , what net reaction will occur? A-The reaction will proceed to the left to establish equilibrium. B-The reaction
  62. chemistry

    For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than
  63. Chemistry

    Iodine combines to form I2 in liquid propane solvent with a constant of 1,5 x 10^10 L/mol. The rate is 2nd order. Since the reaction occurs quickly, a flash of light creates an I concentration of .0100M. How long will it take for 95% of the atoms to form
  64. biology

    what is the chemical reaction that produces a polymer form of a biomolecule?
  65. chemistry

    How many {\rm NO}_{2} molecules would form as products if the reaction had a percent yield of 75\%?
  66. Chemistry

    I have to write the equation for the following and I am not figuring it out.I was out with flu and so lost...please help. How many moles of Hydrochloric acid are needed to dissolve 39.0 grams of aluminum Hydroxide? How many grams of precipitate will form a
  67. Help! Help! Organic Chemistry

    Alcohol Dehydration of 4-methyl-2-pentanol (a)based on the mechanism of the reaction, explain why (E) and (Z) 4-methyl-2-pentenes and the 2-methyl-2-pentene are the three major alkene products. (b)Explain why the reaction conditions promote carbocation
  68. chemistry

    For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than
  69. chemistry

    For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than
  70. Chemistry

    For a one step reaction, the activation energy for the forward reaction is 40.0 kJ/mol and the enthalpy of reaction is -20.0 kJ /mol. Which statement below is true? a. The activation energy of the forward reaction would be affected to a greater extent than
  71. Chemistry 2

    The mechanism for the reaction of nitrogen dioxide with carbon monoxide to form nitric oxide and carbon dioxide is thought to be the following. NO2 + NO2 NO3 + NO Slow NO3 + CO NO2 + CO2 Fast What would be the overall balanced equation to this reaction?
  72. chemistry

    Reacting Mg with acid solution to form Mg salt and Hydrogen gas. What are the: 1.general reaction type 2. Chemical equation include phase 3. complete ionic equation include phase 4. chemical equation for the reaction between magnesium with water
  73. chemistry

    A first order reaction and a separate second order reaction both have the same rate of reaction. What is the effect on the rate of reaction for each reaction if the concentrations of reactants in both reactions are halved?
  74. organic chemistry

    Something that isn't consumed by the reaction (so say A) is dissolved at the same time as something that is consumed by the reaction (B) in a solvent, so that they are in the same phase...what is this reaction an example of? What is the most pervasive
  75. Organic chemistry

    Help with prediction products of a reaction! 4-phenylbutanoyl chloride + AlCl3 --> ? the molecular formula of the product is C10H10O, and I need to determine the product. I was thinking an acylium ion would form, and then the carbonyl carbon would form
  76. chem

    Consider the following reaction: 2 CH3OH + 3O2 to form 2 CO2 + 4 H20 Each of the following molecular diagrams represents an initial mixture of the reactants. How many CO2 molecules would be formed by complete reaction in each case? How do I use the
  77. chemistry

    a 1.009g mixture of the solid salts Na2SO4 and forms an aqueous solution with the precipitation of PbSO4. The precipitate was filtered and dried and its mass was determined to be .471 g. the limiting reactant was determined to be Na2SO4. Write the
  78. chemistry

    The activation energy of a reaction is typically determined by calculating the rate constant for the reaction at two temperatures and then manipulating the Arrhenius equation. If you determine the reaction rate constants for a particular reaction to be
  79. Chemistry

    Nitrogen dioxide, NO2, dimerizes easily to form dinitrogen tetroxide , N2O4 : 2NO2<===>N2O4 a) Calculate Change in reaction G* and K for this equilibrium. b) Calculate the (e) (the measure of the progress of the reaction) for this equilibrium if 1.00
  80. chemistry

    If you need to multiply the following reaction by 2 to be an intermediate reaction in a Hess's law problem, what would be the final value for the enthalpy of reaction you use for this intermediate reaction? C2H4 + 3 O2 2 CO2 + 2 H2O, H = -1410 kJ
  81. Chemistry

    In an endothermic reaction at equilibrium, what is the effect of raising the temperature? The reaction makes more products the reaction makes more reactants*** the reaction is unchanged the answer cannot be determined
  82. ap chemistry

    Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO + O2 yields 2CO2 Delta H for this reaction is -135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1). 270.5 mol 2). 40.5 mol 3). 12.0 mol
  83. AP Chemistry

    Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) --> 2CO2(g) change in H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1. 16.3 mol 2. 40.5
  84. Chemistry

    Virtually all the nitric acid manufactured commercially is obtained by the ammonia oxidization process. This involves this first step: Ammonia gas combines with oxygen to form nitrogen monoxide and water vapour. a) Write a balanced equation for the
  85. Chemistry

    The reaction between 0.045 g of calcium with an excess of water was carried out in an ice calorimeter as used in this lab. The volume of water in the calorimeter decreased by 0.18 mL during the reaction a) Write the equation for the reaction which occurs.
  86. Chemistry

    Draw a reaction profile (diagram of energy vs reaction coordinate) for a hypothetical reaction AB +C <=> A+BC in which the foward reaction has an activation energy of 100kJ mol-1 and the backward reaction has an activation energy of 75kJ mol-1. (ii).
  87. chemistry

    Will sodium sulfide and iron II sulfate form a precipitate? if so what would the reaction look like?
  88. science

    Hydrogen Cyanide (boiling temperature 26 degrees Celsius) is an important chemical for the production of nylon and various transparent plastics. It is produced on an industrial scale by the oxidation of methane in the presence of ammonia. The equation
  89. Chemistry

    1) A double displacement reaction takes place when aqueous sodium carbonate reacts with aqueous tin (II) nitrate. You would expect one of the products of this reaction to be. Answer: Sn(CO3)2 2) For the reaction, 3 Cu + 8HNO3 --> 3Cu(NO3)2 + 2NO + 4H2O,
  90. Chemistry

    In which direction will the net reaction proceed. X(g) + Y(g) <==> Z(g) .. Kp = 1.00 at 300k for each of these sets of initial conditions? 1) [X] = [Y] = [Z] = 1.0 M a] net reaction goes to the left [this one?] b] net reaction goes to the right c]
  91. chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 2.091×10−3 M−1s−1. What is the initial rate of reaction
  92. Science

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 1.091×10−3 M−1s−1. What is the initial rate of reaction
  93. chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 5.591×10−3 M−1s−1. What is the initial rate of reaction
  94. chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 2.591×10−3 M−1s−1. What is the initial rate of reaction
  95. Chemistry

    The fictitious compound, arrhenium fluoride (AhF), reacts with itself to form a dimer with the formula Ah2F2. The reaction is second order in AhF. The value of the rate constant is 4.091×10−3 M−1s−1. What is the initial rate of reaction
  96. Physical science

    A silver Christmas tree can be made by placing copper wire,shaped in the form of a tree,into a silver nitrate solution.The unbalanced equation for the reaction is:Cu+AgNO3=Cu(NO3)2+Age 9.1 define the term oxidation in terms of oxidation numbers (9.2) write
  97. Chemistry

    You read a reversible reaction from left to right in the forward direction. This direction shows which of these occurring? a) the reactants forming a product b) the product decomposing to form reactants c) both a and b occurring d) b occurring, followed by
  98. chemistry

    A 1.009g mixture of Na2SO4 (molar mass=142.04 g/mol) and Pb(NO3)2 (molar mass= 331.20 g/mol)? A)write th3 molecular form of the equation for the reaction. b)write the net ionic equation for the reaction.
  99. chemistry

    Hi, I am trying to find the pH of a buffer I created and then added NaOH to. This is my data: total volume of solution 34.2 mL [NaOH] before reaction 6.0 [HOAc] before reaction .8 M [OAc-] before reaction .4 M [HOAc] after reaction 0 M [OAc-] after
  100. Chemistry

    If a catalyst is added to a system at equilibrium and the temperature and pressure remain constant there will be no effect on the: (1) rate of the forward reaction (2) rate of the reverse reaction (3) activation energy of the reaction (4) heat of reaction