1. Physics

    A hollow sphere of radius 0.30 m, with rotational inertia I = 0.080 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 19° to the horizontal. At a certain initial position, the sphere's total kinetic energy is

    asked by Mario on October 22, 2009
  2. Chemistry

    I posted this last night, A 0.500L vessel initially contains 0.0125 mol of H2S2 . Find the equilibrium concentrations of H2 and S2. Kc = 1.67 x 10^-7 2 H2S 2 H2 + S2 I have come up with this equation so far, but I am lost now because I don’t even know if

    asked by Veronica on June 8, 2014
  3. Chemistry

    If the pH of a solution is 6, what are the hydrogen- and hydroxide-ion concentrations? The PH of a 0.1 M MCl (M+ is an unknown cation) was found to be 4.7. Write the net ionic equation for the hydrolysis of M+ and its corresponding equilibrium expression

    asked by Jefferson on February 19, 2013
  4. math

    a baseball is hit straight up from a height of 6 feet with an initial velocity of90 feet per second. given the equations=-16t^2 +v0t + s0, that models the height of the ball,s, as a function of time ,t where the initial height of the ball is s0 and the

    asked by sara on October 21, 2018
  5. High School Physics

    The men's world record for the shot put, 23.12m , was set by Randy Barnes of the United States on May 20, 1990. If the shot was launched from 6.00 f above the ground at an initial angle of 42.0 degrees , what was its initial speed? Someone plz help =-(

    asked by Crying Girl on September 15, 2009
  6. physics

    for this question A bullet is fired from a rifle that is held 1.8 m above the ground in a horizontal position. The initial speed of the bullet is 1120 m/s. Find why is the equation just (.5)(9.8)(t^2)=1.8 why don't we have to take in account for initial

    asked by Jordan on December 7, 2009
  7. physics

    A cannon sends a projectile towards a target a distance 1250 m away. The initial velocity makes an angle 40◦ with the horizontal. The target is hit. The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the initial veloc- ity? Answer in

    asked by Wendia on September 20, 2010
  8. Chemistry/Env Sci

    a)the E0 for the reactions 2HOCl + 2H+ + 2e- → Cl2 + 2H20 and Cl2 + 2e- → Cl- are 1.63 and 1.396 volts respectively. Write the half reaction of HOCl being reduced to Cl- and develop the full pE/pH equation for this reaction. b)What is the pE of a

    asked by Dave on August 1, 2013
  9. chemistry

    2. Baking soda is sodium bicarbonate (NaHCO3). When you heat baking soda, it breaks down into sodium carbonate powder (Na2CO3), water vapor, and carbon dioxide. The enthalpy of this reaction is 129 kJ. Write a correct thermochemical equation for this

    asked by dd on May 14, 2012
  10. Math

    Hello again! You might see me a lot today. Just a heads up. 1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D.

    asked by Tia on February 3, 2015
  11. physics

    Draw energy graph of the reaction where energy reaction is 1kg mol-1 the energy of the product is 50kg mol-1 and the activation is 50kg mol-1.state whether reaction is exothermic o endothermic

    asked by nokwanda on August 23, 2014
  12. Chemistry

    Please show me how to work! thanks When Snno2(s) is formed form the comustion of gray tin, the reaction enthalpy is -578.6 kJ, and when white tin is burned to form SnO2(s), the reaction enthalpy is -580.7 kJ. Calculate the reaction enthalpu for

    asked by Sam on October 21, 2012
  13. College Chemistry

    The molar heat of reaction, H rxn, for the reaction of Ca(s) + 2H+(aq) Ca2+(aq) + H2(g) is -544.789 kJ/mol and Hrxn, for the reaction of CaO(s) + 2H+(aq) Ca2+(aq) + H2O(l) is -192.42 kJ/mol, the heat of formation of water is -286 kJ/mol, The H ffor CaO(s)

    asked by HELP PLEASE! on February 18, 2011
  14. chemistry

    First of all, you need to know how many g of Mg actually reacted in the first reaction. You can determine this by determining the limiting reactant. The reaction is Mg + F2 -> MgF2 16.2 g of Mg is 16.2/24.32 = 0.666 moles 25.3 g of F2 is 25.3/38.0 = 0.666

    asked by drwls on August 30, 2005
  15. Please Help Me

    Use the equation for the synthesis of hydrogen to answer the following. C (s) + H2O (l) -> CO (g) + H2 (g) deltaH = + 31.3 kcal/mol carbon deltaS = +32 cal/(mol•K) Calculate the energy change (deltaH) when 5.00 g of carbon is consumed. Calculate the

    asked by John on February 20, 2013
  16. chem

    A hydrofluoric acid buffer solution has the following concentrations: [HF]=0.43M [F-]=0.45M If 40 mL of 0.1M NaOH is added to 500 mL of the buffer, what is the resultant pH?

    asked by Jess on April 20, 2012
  17. Chemistry

    Pb(NO3)2(aq) 2 x 10-3 M and Na2SO4(aq) 2 x 10-3 M Identify the ions that are present in each solution, and calculate their concentrations. If 1 L of each solution are mixed, will a precipitate be formed? Why?

    asked by Sam on May 16, 2012
  18. college algebra

    A doctor prescribes an ointment that is 4% hydrocortisone. A pharmacist has 1% and 5% concentrations in stock. How many ounces of each should the pharmacist use to make a 3-ounce tube?

    asked by Anonymous on September 10, 2014
  19. Chemistry

    The decomposition of HI(g) is represented by the equation: 2HI(g) H2(g) + I2(g) Kc= 64 at 25°C. If the equilibrium concentrations of H2 and I2 at 400°C are found to be [H2] = 5.4x10-4 M and [I2] = 8.8x10-3 M, what is the equilibrium concentration of HI?

    asked by Adam on October 18, 2010
  20. chemistry

    would the pKa = pH in this case? because the ml and concentrations are equal in each scenario? If you plug it in the formula, I think your logs would equal 0 because it would be log(1) = 0. My asnwer is not coming out right though.

    asked by Sara on July 12, 2010
  21. physics

    what is the minimum initial speed of the dart if it is to hit the monkey before the monkey hits the ground, which is 14.2 m below the initial position of the monkey, if x is 47 m and h = 13 m? (Ignore any effects due to air resistance.)

    asked by Anonymous on October 21, 2011
  22. Math

    1. Which function represents an initial population that increases 22% per year where A represents the initial value and X represents time in years? A. Y=A(0.22)^x B. Y=A(0.68)^x C. Y=A(1.22)^x D. Y=A(1.68)^x I do not get how to solve this problem. Any help

    asked by Alan on April 29, 2015
  23. Chemistry

    Hydrogen gas is a very environmentally friendly fuel source. One factor that is important in determining whether it is used as a fuel source is the cost of production. Use the two equations below to evaluate which reaction requires more energy to produce 1

    asked by Nawal on August 8, 2017
  24. chemistry

    What effect does raising the temperature of the reaction chamber at a constant pressure have on the following reaction at equilibrium? 2NO2(g) N2O4(g) + heat A. The equilibrium shifts toward the reactants because the reverse reaction is endothermic. B. The

    asked by erika on September 15, 2016
  25. Chemistry

    Oxidation of bis(bipyridine) copper (I) ion by molecular oxygen is described by the equation: Cu(C10H8N2)2+(aq) + O2(aq) ----products The reaction is first order in oxygen and second order in Cu(C10H8N2)2+ (a) Write the rate law (b) What is the overall

    asked by Sabrina P on March 8, 2013
  26. science

    I'm doing a lab for Le Chatelier's Principle. I'm concerned that all my answers sound very similar. Can someone help me and let me know if my answers are making sense? ~Thanks 1.) How is the reaction Zn(OH)2 Zn^+2 + 2OH- affected by adding OH- I think

    asked by Tammy on March 20, 2015
  27. Chemistry

    To an initially evacuated 50.0L container maintained at 155C were added 3.20g of gaseous xenon and 4.00g of gaseous fluorine. A spark was used to initiate reaction between xenon and fluorine, and gaseous xenon hexafluoride was the sole reaction product.

    asked by Angie on January 28, 2011
  28. Motion equation

    A stone, which weighs 0.62kg, is thrown, at 5.5ms, its kinetic energy at its maximum height above the surface is 2.3J, what is the height of the stone at this point? Any eqautions or advice gratefully received. I assume that is 5.5 m/s, the initial

    asked by Mac on December 17, 2006
  29. Chemistry

    Use the equation for the synthesis of hydrogen to answer the following. 10 points. C (s) + H2O (l) -> CO (g) + H2 (g) deltaH = + 31.3 kcal/mol carbon deltaS = +32 cal/(mol•K) Calculate the energy change (deltaH) when 5.00 g of carbon is consumed.

    asked by John on February 20, 2013
  30. Chemistry

    I need to work out a mechanism for the synthesis of 2-cyclohexylpropanal. I am not sure what the reaction is to make this or what reagents to start from. I thought that maybe it could be an aldol reaction starting from cyclohexanone and propanal but I'm

    asked by Alice on September 5, 2010
  31. chemistry

    What chemical reaction is responsible for the endpoint observed when the NH3/NH4Cl buffer solution is titrated with HCl? Write a blanced ionic equation for the reaction.

    asked by redgy on March 27, 2011
  32. chemistry

    Determine whether a reaction will take place in the following and write a complete balanced equation: You must include phase labels. Use NR for no reaction. 1.) Ca(OH)2 (aq) + Al(NO3)3 (aq) → 2.) Cu(C2H3O2)2 (aq) + Na2SO4 (aq) → 3.) H2SO4 (aq) + KOH

    asked by april on July 1, 2018
  33. chemistry

    Complete and balance the chemical equation using compound formulas. Include the states. If there is no reaction, enter NR. Pb(NO3)2(aq) + NaI(aq) → sine Pb is not reactive, the reaction is NR. Am i correct?

    asked by blasting on February 9, 2010
  34. chemistry

    write the balanced molecular and net iconic equations for the reaction between aluminium metal and silver nitrate. Identify the oxidation and reduction half-reaction

    asked by jake on October 20, 2014
  35. Chemistry

    Answer the questions about the following reaction. 4Al(s) + 3O2(g) 2Al2O3 (s) How many molecules of O2 are used in the reaction? How many oxygen atoms are required? How many moles of Al2O3 are formed? What is the mole ratio of Al to O2?

    asked by Raven-Sierra on November 30, 2016
  36. chemistry

    the frequency factor and activation energy for a chemical reaction ate A=4.8 x 10^-12cm^3 and Ea=11.1kJ/mol at 327 K respectively. Determine the rate constant for this reaction at 327K

    asked by kimberly on November 12, 2014
  37. chemistry help

    the rate constant (k) for a reaction was measured as a function of temperature. A plot of In k versus 1/T (in K ) is linear and has a slope of -1.01 x 10^4 K. Calculate the activation energy for the reaction. i don't know how to solve it???

    asked by sue on January 31, 2011
  38. chem 100 electrochemisty

    . The reaction Pb(s) + 2HCl(aq)  H2(g) + PbCl2(s) occurs in a beaker and is found to be exothermic. Calculate Eo (So im assuming that CL does not change so i discluded it now im stuck with a reaction with a negative E which im pretty sure is wrong)

    asked by Mall on May 9, 2015
  39. chemsitry

    1)Balance the following gas-phase reaction and 2) write its reaction quotient, Qc: CH4(g)+F2(g)......>>.....

    asked by patrick on September 29, 2015
  40. Chemistry

    in a particular redox reaction, MnO2 is oxidized to MnO4– and fe3+ is reduced to fe2+. Complete and balance the equation for this reaction in acidic solution. Phases are optional.

    asked by lori on November 21, 2014
  41. chemistry

    At 25∘C the reaction from Part A has a composition as shown in the table below. Substance Pressure (atm) C2H2(g) 4.65 H2(g) 3.85 C2H6(g) 5.25×10−2 What is the free energy change, ΔG, in kilojoules for the reaction under these conditions?

    asked by wamie on September 21, 2014
  42. Chemistry

    Diborane and related compounds were proposed as rocket fuels in 1950s. A representative reaction for this class of molecules that B2H6 and O2. Write the balanced chemical reaction

    asked by PJcotieboi on August 20, 2012
  43. organic chemistry

    Show the reaction of 1-naphthylamine hydrochloride with sodium hydroxide using structural formulas. Indicate which layer (aqueous or organic) each component in the reaction will mainly reside in (for both products and reactants). How is this done?

    asked by sarah on February 6, 2009
  44. Chemistry

    In a copper cycle lab if I add HCl to CuO to produce CuCl, what would a word equation for that reaction be? Is it a chemical reaction? and also for that step what complexes are observed? what does that mean?

    asked by Dan on November 8, 2015
  45. Chemistry

    In a copper cycle lab if I add HCl to CuO to produce CuCl, what would a word equation for that reaction be? Is it a chemical reaction? and also for that step what complexes are observed? what does that mean?

    asked by Dan on November 8, 2015
  46. College Chemistry

    The initial concentration for the compounds involved in the reaction shown were determined to be [CH4(g)] = 0.6616 mol/L, [H2O(g)] = 0.8127 mol/L, [CO(g)] = 0.9566 mol/L, [H2(g)] = 0.7688 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200

    asked by Morgan on June 12, 2012
  47. cpcc

    A frictionless plane is 10.0 m long and inclined at 33.0°. A sled starts at the bottom with an initial speed of 4.30 m/s up the incline. When the sled reaches the point at which it momentarily stops, a second sled is released from the top of the incline

    asked by thomas on September 27, 2010
  48. biology

    what is the difference between an exergonic reaction and an endergonic reaction?

    asked by daniel on September 25, 2015
  49. Organic Chem

    What is the generic reaction equation for the Maillard reaction? Please help ^_^

    asked by Ayla on March 18, 2010
  50. Chemistry

    What is the chemical reaction for: The reaction of phenol and 1-propanol

    asked by Ceamus Angelina on June 3, 2018
  51. Chemistry

    What is the chemical reaction for: The reaction of bromine with 2-pentene

    asked by Ceamus Angelina on June 3, 2018
  52. Chemistry

    What is the product of the following reaction: Mn(s) + Cu(NO3)2 -> I just want to make sure if it's Mn+2 + Cu(s) or if there's no reaction...

    asked by Catherine on February 25, 2011
  53. chemistry

    reaction of benzoic acid with propylamine. if there no reaction why

    asked by felice on April 20, 2013
  54. Chemsitry

    If Kc = 6.38 × 105 for the reaction A(g) ⇀ ↽ 2B(g), what is Kc for the reaction written as 2B(g) ⇀ ↽ A(g)? How would I solve this?

    asked by Sara on April 26, 2014
  55. Chemistry

    Complete and balance this decomposition reaction HI ==> is this reaction HI ==> H + I ? or... HI ==> H2 + I2 ? why?

    asked by Jack on March 15, 2010
  56. Chemistry

    What is the standard enthalpy of reaction for the following reaction: H2 + 1/2 O2 --> H2O(g)

    asked by Lauren on March 11, 2011
  57. Chemistry

    what is the relationship between reaction spontaneity and the extent of reaction?

    asked by meme on April 13, 2012
  58. Chemistry

    For a particular reaction, ΔH = -328.21 kJ and ΔS = 98.7 J/K. Calculate ΔG for this reaction at 298 K.

    asked by Jay on January 18, 2015
  59. chemistry

    HF reaction with MnO2 Explain why it is a redox reaction?

    asked by Fran on July 2, 2017
  60. Physics

    A projectile, fired with unknown initial velocity, lands 18.4 s later on the side of a hill, 2740 m away horizontally and 469 m vertically above its starting point. (Ignore any effects due to air resistance.) (a) What is the vertical component of its

    asked by Anonymous on December 5, 2014
  61. Physics

    How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron:

    asked by Monika on February 5, 2014
  62. Physics

    How much energy (in MeV) is released in the reaction proton + deuteron goes to 3He + gamma? (You may ignore the initial kinetic energy of the reactants.) For the purposes of this problem, use the following masses (in MeV/c2): Proton: 938.783263054 Neutron:

    asked by Monika on February 5, 2014
  63. Chemistry

    How do you know that a given reaction is not an acid base reaction? (apart from the fact that it should have an acid and a base and it should be a double displacement reaction)? I mean I know acids have protons (H+) and bases have hydroxides (OH-) but

    asked by Anon on December 16, 2014
  64. Chemistry

    H2(g) + I2(g) 2 HI(g) The forward reaction above is exothermic. At equilibrium, what happens if I2 is removed from the reaction mixture at constant temperature and volume? The reaction absorbs energy. The reaction releases energy. [H2] increases. [H2]

    asked by Megan on September 20, 2010
  65. Pre-cal

    A ball is thrown vertically upward with an initial velocity of 96 feet per second. The distance s (in feet) of the ball from the ground after t seconds is s(t)=96t-16t^2 projectile formula: s(t)=1/2gt^2+v+t+h g=acceleration due to gravity. V= the initial

    asked by Lissa on December 5, 2017
  66. Physics - please help!

    I don't understand how to answer this problem or even which equation to insert it into: "A Dancer leaps across the stage in a beautiful grand jete. The ballerina leaps at an angle of 45° and is able to jump a horizontal distance of 1.5m in 0.547s. What is

    asked by Mariam on March 28, 2018
  67. Physics

    A juggler throws a ball with an initial horizontal velocity of +1.1 m/s and an initial vertical velocity of +5.7 m/s. What is its acceleration at the top of its flight path? Make sure to consider the sign when responding. Consider the upward direction as

    asked by Alexandra on September 13, 2014
  68. (1-16)Chemistry - Science

    Consider the reaction: SO2 (g) + NO2 (g) ==> SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 The reaction vessel is charged initially with all four gases, each at a pressure of 0.5 atm. After

    asked by Ana on May 10, 2014
  69. Chemistry

    Using G (measure of free energy) to determine wether the reaction 4Fe(s)+3O2(g)-> 2Fe2O3(s) is spontaneous at 25C, given that H=.393kcal and S=-0.13 kcal/(mol*K). Is the reaction more or less spontaneous at 1000C assuming that H and S remain constant with

    asked by Christina on November 16, 2009
  70. science

    home / homework help / questions and answers / science / physics / the temperature of an ideal gas at an initial pressure ... Question The temperature of an ideal gas at an initial pressure P1 and volume V1 is increased at constant volume until the

    asked by ahmad on January 8, 2015
  71. Chemistry

    Assume equal aqueous concentrations of each of the following substances. Which has the lowest freezing point? C2H12O6 CH3OH C12H22O11 NaOH i say its NaOH am i right ?

    asked by Jazmin on February 24, 2011
  72. Chemistry

    A buffer is prepared by transferring equal concentrations of the components of the conjugate pair, C6H5COOH and C6H5COONa, into a beaker. What is the approximate pH of the buffer? (Ka = 6.5  10–5) a) 2.81 b) 4.19 c) 7.00 d) 9.81 e) 11.19

    asked by Greg on July 31, 2012
  73. Chemistry

    A phosphate buffer solution contain 0.08 M K2HPO4 and 0.12 M KH2PO4. pKa values for H3PO4 are 2, 6.8, and 12.2. Calculate the concentrations of a) H3PO4 b) H2PO4- c) HPO42- d) H+ e) OH- f) K+

    asked by James Alonso on March 25, 2015
  74. BIOCHEMISTRY

    Calculate the formal concentrations of acetic acid and sodium acetate necessary to prepare a buffer solution of pH 5 that is 0.20M in total acetate?

    asked by SAAD on February 5, 2017
  75. Chemistry

    H2 (g)+I2 (g)↔2HI(g) Calculate ΔG for the system at 700 K when the concentrations are [H2] = 0.12M, [I2] = 0.27M, and [HI] = 0.118M. What would be my first step? If I make an ICE chart, what would I do from there? I just need the first step to help me

    asked by Robby on May 3, 2015
  76. college chemistry - answer check ASAP!

    The corrosion of iron can be thought of as an electrochemical cell reaction. Calculate the voltage difference between two points of corroding iron differing only in their partial pressures of oxygen: 0.20 atm of oxygen at one point and 0.0010 atm of oxygen

    asked by anne on March 13, 2010
  77. chemistry

    An endothermic reaction was found to have an activation energy of 100 kJ. If this reaction is reversed, the activation energy is only 20 kJ. What is the value of delta H for the endothermic reaction?

    asked by amanda on December 30, 2011
  78. COLLEGE PHYSICS

    A rocket is launched at an angle of 60.0° above the horizontal with an initial speed of 99 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move

    asked by CARY on September 11, 2010
  79. physics

    You are holding the neck of a champagne bottle at an elevation of 27 degrees when you pop the cork. The highest point in the cork's flight is 3.5 m above its initial height. What was the cork's initial speed? Use SI units in the second box.

    asked by sean on February 16, 2014
  80. Chemistry

    The heat evolved in the reaction of hydrobromic acid with potassium hydroxide was determined using a coffee coup calorimeter. The equation for the reaction is: HBr(aq) + KOH(aq) -------------> KBr(aq) + H2O(l) When 25.0 mL of 1.00 M HBr at a temperature of

    asked by Joe on November 17, 2017
  81. Chemistry

    C(g) + 2A(g) ⇌ 3E(s) + 2F(g) The concentrations of C, A, and F are measured as 0.2 M, 0.2 M, and 0.4 M at equilibrium and at 100 K. What is the value of the equilibrium constant?

    asked by Summer on April 11, 2018
  82. chem

    If the pH of a solution is 9, what are the hydrogen ion and hydroxide ion concentrations?

    asked by maree on February 1, 2012
  83. Chemistry

    C(g) + 2A(g) ⇌ 3E(s) + 2F(g) The concentrations of C, A, and F are measured as 0.2 M, 0.2 M, and 0.4 M at equilibrium and at 100 K. What is the value of the equilibrium constant? a. 25 b. 20 c.10 d. 15

    asked by Michael on June 13, 2018
  84. Chemistry

    Calculate the concentrations of each of the ions in 0.25 M Fe(NO3)2. a) [Fe2+], M b) [NO3-], M

    asked by Jessica on June 27, 2011
  85. Chemistry

    Calculate the concentrations of each of the ions in 0.25 M Fe(NO3)2. a) [Fe2+], M b) [NO3-], M

    asked by Emily on June 27, 2011
  86. Chemistry

    If 15.0 mL of a 1.5M HCl solution at 22.5 degrees C is mixed with 25.0mL of a 1.5M NaOH solution at 21.5 degrees C that is in a calorimeter, and the final mixed solution temperature ends up at 28.5 degrees C, 1.)what is the balanced equation for this

    asked by Jennifer on April 14, 2014
  87. AP Chemistry

    A mixture of 20.0 grams of CaO and BaO is placed in a 12.5 L vessel at 200oC with excess CO2 . The mixture is allowed to react to completion forming CaCO¬3 and BaCO3 .The pressure in the container after reaction is 220 torr. The solid carbonates are

    asked by Jim on January 2, 2015
  88. College Physics

    A single resistor is wired to a battery. Define the total power dissipated by this circuit as P(initial). What is the Power? Now, a second identical resistor is wired in series with the first resistor. What is the power, in terms of P(initial), dissipated

    asked by Lanise on February 8, 2010
  89. Physics

    So...the question is that a coil spring has a force constant of k = 4.0 lb/in. When the spring's axis is inclined at an angle 30 degrees form horizontal, a Weight = 2.0 oz ball is propelled to a height of 6.0 ft. By how much must the spring have been

    asked by Nora on March 22, 2015
  90. Science- Chemistry Ap

    2SO3(g) -> 2SO2(g) + O2(g) Delta H = 197kj For this reaction shown above, describe the changes that will occur to the number of moles of SO3 under the following conditions: (a) Additional oxygen is added to the reaction vessel. (b) The pressure in the

    asked by Jake on April 29, 2010
  91. chemistry

    What is the standard entropy of reaction, the standard entropy of reaction, in J/K, for the combustion reaction of ethylene described in the previous questions? The temperature is 298.15K. (Enter your answer as a signed number in scientific notation

    asked by bekah on April 25, 2014
  92. chemistry

    write the equations for the addition reaction of ethene with bromine under the following conditions. a) reaction in the presence of sunlight H2C=CH2+Br2 sunlight=? b) reaction in the absence of sunlight H2C=CH2+Br2=?

    asked by denis on November 22, 2011
  93. Chemistry

    . In a biochemical reaction, A + B-->C with äG = 30 kJ/mol. Which of the following reactions might be effectively coupled to this reaction so that it becomes more spontaneous? I. C + D are the reactants, and B + E are the products äG = -40 kJ/mol II. C +

    asked by Taylor on July 30, 2012
  94. Chemistry

    The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. Consider the reaction: P4(s) + 6 Cl2(g) → 4 PCl3(l) If 19.47 g P4 is mixed with 6.85 g Cl2, calculate the theoretical yield

    asked by Riley on November 26, 2015
  95. Chemistry

    How do I calculate the amount of grams of Na2HPO4 and NaH2PO4 to prepare 200 mL of a buffer with an 8.25 pH so the sum of the concentrations of HPO4 and H2PO4 ions is 0.5 M? Does this involve writing a Ka expression and equilibrium? I am confused and

    asked by Carrie on March 11, 2012
  96. Chemistry

    Use two concentration tables to calculate the concentrations of the species present in a 0.0400 M solution of CsBrO. a.[HBrO] b.[BrO-] = 0.0400M c. [H3O+] d.[OH-] hi. how would I attempt this problem. can you walk me through it or give me a hint.

    asked by J on November 14, 2016
  97. Chemistry

    How do I calculate the amount of grams of Na2HPO4 and NaH2PO4 to prepare 200 mL of a buffer with an 8.25 pH so the sum of the concentrations of HPO4 and H2PO4 ions is 0.5 M? Does this involve writing a Ka expression and equilibrium? I am confused and

    asked by Carrie on March 11, 2012
  98. Check my answers? (Chemistry)

    I only get one chance for each of these questions so I was wondering if someone could check my answers, thanks! 1. Consider the following reaction at equilibrium. 2 BrNO(g) ---> 2 NO(g) + Br2(g) Predict the effect of the following changes to the reaction

    asked by Rebekah on April 19, 2011
  99. Chemistry-Dr.Bob

    Since most chemical reactions are conducted in containers open to the armisphere, why is the energy transfer associated with a chemical reaction generally expressed as the change in enthalpy? Is it because the enthalpy of reaction measures the change in

    asked by Sanaya on January 11, 2016
  100. Chemistry

    separate this redox reaction into its component half-reactions. O2 + 4Cu-->2CuO Oxidation half-reaction: ? Reduction half-reaction: ? I believe that the Oxidation is copper and that reduction is oxygen. So I tried to write it as 4Cu^+ --> 4Cu + 4e^- O2^2-

    asked by Sophie on April 28, 2014