1. Applied physics

    the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel, what is the equilibrium composition of the mixture at 230 degrees celcias?
  2. applied chemistry

    the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel, what is the equilibrium composition of the mixture at 230 degrees celcias?
  3. Spanish 1

    59. ¿Con ____ vas al cine? a. qué b. quién c. qué estación d. cuál B? 60. No estoy bien. Estoy ______. a. enferma b. ocupada c. deportista d. graciosa A? 61. No quiero ir el fin de semana. Voy a ir ______. a. el sábado b. el martes c. los sábados
  4. chem

    determining hydroxide and hydrogen concentrations? what formulas ?
  5. chemistry

    Calculate the H3O^+ and OH^- ion concentrations in a solution that has a pH of 3.72.
  6. chemistry

    find the concentrations of Ca^2+ and F^- in a saturated solution of CaF_2_
  7. Chemistry

    Are the concentrations of CO, H2O, CO2 and H2 necessarily equal
  8. Spanish

    Multiple Choice Escoge el mandato correcto para las siguientes oraciones. Nota el tono, formal o informal. 6. Chicas por favor ____ (venir) conmigo a la pelicula. No quiero ir sola. A) venid B) vengais C) vengan D) vengamos 7. Estimados senores y senoras,
  9. science(chem)

    I'm making different concentrations of ethanol and I just wanted to check my calculations and method. Making ethanol concentrations of: 0.40% 0.30% 0.20% 0.10% 0.05% To make the 0.40% ethanol from stock solution using 100ml volumetric flask: (xg
  10. Chemistry II - Concentrations

    At 30.°C, the concentration of hydronium (H3O^+) ions in an aqueous solution is 1.1 ✕ 10^−9 M. (Note: At 30.°C, the ion-product constant for water is 1.46 ✕ 10^−14.) (a) What is the concentration of hydroxide (OH^−) ions in this
  11. Physics

    The length of a spring increases by 7.2 cm from its relaxed length when a mass of 1.4 kg is hanging in equilibrium from the spring. (a) What is the spring constant? (b) How much elastic potential energy is stored in the spring? (c) A different mass is
  12. chemistry

    a liter of a solution saturated at 25C with CaC2O4 is evaporated to dryness giving a 0.0061 gm residue of CaC2O4. Calculate the concentrations of the ions, and the molar solubility and the solubility product constant for this salt at 25C. Show the balanced
  13. bioelectricity

    Let Pk, Pna and Pcl be permeabilities of squid axon membrane for potassium, sodium and chloride, respectively. During the rest, the ratios of permeabilities are given by Pk:Pna:Pcl = 1.0 : 0.043 : 0.44 During the peak of an action potential these ratios
  14. chemistry

    for the equilibrium H2+CO2<-->H2O+CO Kc=3.18 at 1106K. if each of the four species was initially present at 3.000M calculate the equilibrium concentration of the CO at this temperature..... OK I can get as far as equilibrium (final) H2O=3.000-x
  15. Physics with Calculus

    The system shown in the figure is in static equilibrium. The rod of length L and mass M is held in an unpright position. The top of the rod is tied to a fixed vertical surface by a string, and a force F is applied at the midpoint of the rod. The
  16. chemistry

    1. In the Thermodynamics of Borax Dissolution experiment, a student quickly transferred a 5.00 mL sample of the saturated borax solution into an Erlenmyer flasks using a pipet and pipet pump after the borax solution had cooled to 35oC. The student rinses
  17. science

    Gf of H2CO3 = -616.1 KJ/mol Gf of H20 = -237.1 KJ/mol Gf of CO2 = - 394.4 KJ/mol 3. A. Carbon dioxide dissolves in water to form carbonic acid. Estimate the thermodynamic equilibrium constant for this reaction using the ΔGf° values shown here. B.
  18. algebra

    Train A and B are traveling in the same direction on parallel tracks. Train A is traveling at 80 miles per hr and train B is traveling at 88 miles per hour. Train A passes a station at 8:10 AM. If train B passes the same station at 8:40 AM, what time will
  19. math

    12 24, 48,96,____,____ find the next two numbers 1,1,2 ,3 _____,_____ find the next two numbers
  20. Chemistry

    What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) but d) is very tempting
  21. chem

    K= 6.9x10^10 which way does this dominate to right or left? for equilibrium constant? this is a hw problem i just don't understand
  22. chem help please

    K= 6.9x10^10 which way does this dominate to right or left? for equilibrium constant? this is a hw problem i just don't understand
  23. chem

    Calculate delta G rxn for a redox reaction with n = 2 that has an equilibrium constant of K = 4.4×10−2.
  24. Chemistry

    The equilibrium constant for the following reaction is 7.2 x 10-10. What is the [H+] in a solution 1.0 M of this acid? HCN + H2O --> H3O+ + CN-
  25. chemisry

    What is the correct way to find an equilibrium constant for the dissolution of a specific chemical at various temperatures?
  26. chem

    Identify the correct equilibrium constant, Keg, expression 2H2(g)+02(g)<->2H20(l)?
  27. chemistry

    Write the equilibrium constant expression for the reaction 2 NO (g) + Br2 (g) ↔ 2 NOBr (g)
  28. Chemistry

    What is the equilibrium constant for the reaction: HCOOH(aq)+ OH (aq) <--> HCOO(aq)+ H2O(l) Ka= 1.7 * 10^-4 Kb for the conjugate base= 4.9 * 10^-11 Thank you!
  29. Chemistry

    Calculate the standard potential, E^o, for this reaction from its equilibrium constant at 298K. X(s)+Y^2+(aq)= X^2+(aq)+Y(s) K=8.68E6 E^o=??V
  30. Chemistry

    Write the equilibrium constant expression for the reaction: 2NO +2H2 =N2+2H2O Kc=?
  31. Physics

    A .6-kg mass at the end of a spring vibrates 3.0 times per second with an amplitude of .13 m. Determine a.) the velocity when it passes the equilibrium point, b.) the velocity when it is .1 m from equilibrium. c.) the total energy of the system, and d.)
  32. Chemistry :(

    Question text Given the following exothermic, equilibrium reaction: 3 H2(g) + N2(g) <--> 2NH3(g) Using Le Chatelier's Principle, which of the following changes would shift the equilibrium toward more production of NH3? Select one: a. Adding a
  33. chemistry

    Consider an insulated system containing 150 g of liquid water and 150 g of ice at equilibrium under atmospheric pressure. A total of 22g of steam at 120◦C is admitted to the system. What is the phase composition and temperature when equilibrium is
  34. Physics

    A 0.50-kg mass at the end of a spring vibrates 3.0 times per second with an amplitude of 0.15 m. Determine (a) the velocity when it passes the equilibrium point, (b) the velocity when it is 0.10 m from equilibrium, (c) the total energy of the system, and
  35. CHEMISTRY

    For the following reaction at equilibrium, indicate if the equilibrium mixture contains mostly products, mostly reactants, or both products and reactants. 2H20(g)-><-2H2(g)+O2(g) kc+4x10-48
  36. Civics

    1.The constitution grants the federal courts ____ in several different kinds of court cases. This gives them the authority to hear and decide cases properly brought before them. 2. The lowest federal courts are trial courts, which have ___, the authority
  37. chemistry

    At 298 K, 1.35 mol BrCl(g) is introduced into a 12.0 L vessel, and equilibrium is established in the reaction. BrCl(g)-->0.5Br2(g) + 0.5Cl2(g) Calculate the amount of BrCl(g) present when equilibrium is established.(Use delta G[Br2(g)]=3.11kJ/mol and
  38. Chemistry

    A certain reaction has an equilibrium constant of 0.65. Calculate the constant for the reverse reaction.
  39. geometry

    prove: the segment joining the midpoints of the two sides of a triangle is parallel to the third side. the coordinates are A(0,0)B(a,0)on the the x axis, and C(c,d), M is midpoint and the coordinates of M is (c/2,d/2) and N is also a midpoint whose
  40. Chemistry

    Given the equilibrium rxn CF4(g) + 2H2O(l) ⇔ CO2(g) + 4HF(g) ΔH < 0 if pressure is increased by adding argon gas to the equilibrium, I know it doesn't decrease the amount of HF. But if a random gas is added for any equilibrium rxn, will it
  41. Chemistry

    1) A Cobalt (II) ion has the electron configuration ____? and is ____? The answer choices were: [Ar] 3d5 4s2 diamagnetic [Ar] 3d7 paramagnetic [Ar] 3d5 4s2 para [Ar] 3d7 dia None of these I chose [Ar] 3d5 4s2 diamagnetic 2) Choose the corect statement
  42. Chemistry

    What would the units of the rate constant k be in a second order equation if rate was measured in mol/(L x s)and all concentrations in mol/L a)L/(mol x s) b)L2/(mol2 x s) c)L3/(mol3 x s) d)mol2/(L2 x s) I think it's b) or a)
  43. chemistry

    There is 0.150 moles of H2 and I2, and are brought to equilibrium in a 3.30 L flask. The equation is H2 + I2 = 2HI. Find the equilibrium amounts of H2, I2, and HI. I'm not getting the correct answer. I set up the formula as x^2/(.04545-x) (.04545-x). To
  44. Chemistry

    1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of
  45. college

    1) You are given solutions of HCl and NaOH and must determine their concentrations. You use 37.0mL of NaOH to titrate 100mL of HCl and 13.6 mL of NaOH to titrate 50.0mL of 0.0782 M H2SO4. Find the unknown concentrations. Molarity of NaOH and molarity of
  46. Algebra 116

    1. Solve using the Elimination Method. 2r - 7s = -57 7r %2B 2s = 39 What is the solution set ______? 2. Simplify -8[-90-(-60-14)]= ______ 3. Solve using the Substition Method. 5x %2B 7y = 41 x = 61 - 8y What is the solution _______? 4. On three consecutive
  47. physics

    Fill in blank without a word bank (unit is wave nature of light) 1. As water waves travels through a slit barrier, they bend and spread out. This is known as ______ 2. Two identical waves will interfere destructively, cancelling one another out, when one
  48. Economics

    Choose an argument in favor of protectionism. Are there any weaknesses in this argument? Be specific. do some research, then take a shot. what are some arguments in favor of protectionism? I have got the first 4 I think but can't figure out the last 2 For
  49. economics

    2. Suppose that the quantity of corn supplied depends on the price of corn, p; and the amount of rainfall, R: The demand for corn depends on the price of corn, p; and the level of income, Y: The equations that describe the supply and demand relationships
  50. Physics- check answer please

    I am supposed to fill in the blanks without a word bank. 1. I you push a crate with 40 N of force at an angle of 30 degrees and your friend pushes with a force of 40 N horizontally, the amount of work you are doing is _____ the amount of work your friend
  51. Chemistry

    Recall that all aqueoous solutions contain_____. Water can also undergo ____. This process is called the ______of water. The reaction can be written as: Notice the double arrow in the reaction. This indicates that the reaction is_____. However, only a tiny
  52. chemistry

    can you explain me how to do this question. any help would be much appreciated. 1) If 0.025 mol of COCl2(g) is placed in a one liter container at 400c, 16.0% of the CoCl2 is dissociated when equilibrium is established. COCl2(g)-> Co(g)+Cl2(g) calculate
  53. Physics

    A 0.70 kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15 m. Determine the velocity when it passes the equilibrium point. Determine the velocity when it is 0.11 from equilibrium. Determine the total energy of the system.
  54. Chem

    Please someone Help!! Acetic acid, CH3COOH, is a weak organic acid, pKa 4.47. Determine the position of the equilibrium for the reaction of acetic acid with NaHCO3, and draw the species that predominates at equilibrium.
  55. physics- multiple choice

    1. A transport truck pulls on a trailer with a force of 600N [E]. The trailer pulls on the transport truck with a force a) of zero b) of less than 600 N is the truck is slowing down c) equal to 600 N only if the truck is moving at constant velocity d)
  56. math

    Ito is training to run a 10 kilometer race in five months. His current pace is 6.25 minutes per kilometer. He wants to constantly increase his speed each month until he is running a 5.5 minute kilometer. Ito needs to increase his pace by ____ each month.
  57. Math

    Ito is training to run a 10 kilometer race in five months. His current pace is 6.25 minutes per kilometer. He wants to constantly increase his speed each month until he is running a 5.5 minute kilometer. Ito needs to increase his pace by ____ each month.
  58. Biochemistry

    Can anyone help?? What are the Concentrations of the various ionic species of a 0.1 M solution of lysine at pH4?
  59. Chemistry

    Calculate the concentrations of H3O+ and OH- ions in a 0.25 M HClO4 solution.
  60. Chemistry

    Find the concentrations of all species in a 0.10mol/l solution of NaOH
  61. chemistry (ap)

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  62. Chemistry

    What are the concentrations of OH– and H in a 0.00070 M solution of Ba(OH)2 at 25 °C? Assume complete dissociation.
  63. Chemistry

    Calculate the pOH and pH at 298K of solutions having the following ion concentrations A.[OH-] = 1.0 X 10^-12 B.[OH-] = 1.3 X 10^-2
  64. Chemistry

    Calculate the pOH and pH at 298K of soloutions having the following ion concentrations A.[OH-] = 1.0 X 10^-12 B.[OH-] = 1.3 X 10^-2
  65. CHEMISTRY

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?
  66. geography

    Now, where are there concentrations of people in the UK? Which are likely to experience problems of water supply?+
  67. Analytical Chem

    What are the molar concentrations of H3O+ and OH- in 0.200 M NaOCL
  68. chemistry

    In pure water at 25 degrees Celsius, what are the concentrations of the products.
  69. English

    1.At what time should Jill and Amy's parents pick ___ up after the party? 2.As we approached the house, one of the dogs began to wag ___ tail. 3.Both of the horses jumped over the low fence between ___ coral and the field. 4.If you want to have a dog, you
  70. CHEMISTRY

    for the reaction system H2 + X2 <->2HX Kc = 24.4 at 300 K a system made up fron these components which is at equilibrium contains 0.150 moles of H2 and 0.600 moles of HX in a 3.00 liter. calculate the number of moles of X2 present at equilibrium.
  71. chemistry

    consider the following equilibrium: Mg(OH)2(aq) <-> Mg2+ (aq) + 2OH-(aq) a) what would happen to the equilibrium if some acid is added to the soultuion? --->OH- would increase causing Mg(OH02 to dissolve b) what would happen to the solubility of
  72. Physics

    Explain how the following changes in a reaction conditions will affect the position of the equilibrium below. A (g) + B (aq) C (s) + heat 1. The temperature of reaction is raised by 20 degrees C 2. As the reacton progresses, more of the compound B is added
  73. Chemistry

    EQUILIBRIUM: Given the equation 2 PbS(s) + 3 O2(g) 2 PbO(s) + 2 SO2(g) What direction will the reaction proceed if additional SO2 was added to the system at equilibrium? Forward Reverse Nothing Happens Difficult to determine You really need to do this
  74. Science

    Vibration and Wave Fundamentals 1. A machine gun fires 10 rounds per second. The speed of the bullets is 300 m/s. (A.) What is the distance in the air between the flying bullets? ____ ANSWER=30 (B.)What happens to the distance between the bullets if the
  75. Math

    A weight is oscillating on the end of a spring. The position of the weight relative to the point of equilibrium is given by y=1/12(cos8t-3sin8t), where y is the displacement (in meters) and t is the time (in seconds). Find the times when the weight is at
  76. **tRiGoNoMeTrY**

    A weight is oscillating on the end of a spring. The position of the weight relative to the point of equilibrium is given by y=1/12(cos8t-3sin8t), where y is the displacement (in meters) and t is the time (in seconds). Find the times when the weight is at
  77. Chemistry

    1. The atmosphere of earth is an example of what kind of solution? A. liquid-liquid B. gas-liquid C. gas-gas*** D. solid liquid 2. Which of the following will result in a greater amount of oxygen dissolving in water? A. Heat the water*** B. Decrease the
  78. Texas Government

    Please tell me which one of these is Federal , Confederal or Unitary . I have already submitted my question but I just want to be sure. ____1..In this system, power is divided between a central government and sub-government. ____2. England ____3. The
  79. Economic

    Beth is single and lives in New York. Beth earned $280,000 in 2011. The following table shows the IRS tax rates for a single taxpayer in 2011 On Taxable Income .. Tax Rates up to $8,500 10% From $8,500 to $34,500 15% From $34,500 to $83,600 25% From
  80. physics

    A mass of 2 kg is hung from the lower end of a vertical spring and extends it by 40 cm. The mass is now pulled down a further 20 cm and is then released from rest so that it oscillates about the equilibrium position. Determine : a) the spring stiffness
  81. chemistry

    Study the reaction. 2A(?) + B(g) ⇌ A2B(g) Both B and A2B are gases. When the reaction vessel is compressed, the equilibrium position does not change. What conclusion can we draw about the state of “A” from this data? A. "A" must be a gas because, if
  82. Chemistry

    Consider the following reaction. 2A(aq) (Two way arrows) B(aq) Kp = 5.48*10^-5 at 500K If a sample of A at 3.10atm is heated to 500K, what is the pressure of B at equilibrium? I know I need to do the ICE table, but am having trouble solving for x once I
  83. chemistry

    At 860.0 deg celsius, the equilibrium constant Kp for the synthesis of ammonia (below) is 3.35 * 10^-5. What is the value of Kc? N2(g) + 3H2(g) <--> 2NH3(g)
  84. Chemistry

    Use the data in Table 15.3 to calculate the equilibrium constant for the following reaction: HCOOH(aq) + OH(aq) <-->HCOO(aq) + H2O(l)
  85. Chemistry

    Calculate the equilibrium constant for the following reaction at room temperature, 25 ∘C: N2(g)+O2(g)→2NO(g)
  86. chemistry203

    Determine the equilibrium constant for the following reaaction at 298K. SO3(g)+J2O(g)->H2SO4(l); delta G = -90.5
  87. chemistry

    write the equilibrium constant expression for each reaction a.) NH3(g)+ CIF3(g)-><3HF(g) +1/2N(g) +1/2Cl2(g)
  88. Chemistry

    Write the equilibrium constant expression for each of the following reactions: A. 4NO(g)+2O^2 <--> 2N^2O^4(g) B. 2NO(g)+ Br^2(g) <--> 2NOBr(g) C. CO(g)+ 2H^2(g) <--> CH^3OH(g) D. SO^2(g) + NO^2(g) <--> SO^3(g) + NO(g)
  89. Physics PLEASE HELP!

    A spring with an unstrained length of 0.076 m and a spring constant of 2.6 N/m hangs vertically downward from the ceiling. A uniform electric field directed vertically upward fills the region containing the spring. A sphere with a mass of 5.09 10-3 kg and
  90. Managerial Economics

    The manager of All City realtors wants to hire some real estate agents to specialize in selling housing units acquired by the Resolution Trust Commission (RTC) in its attempt to bail out the savings and loan industry. The commission paid by RTC to the
  91. Physics Please help

    A thin, horizontal 20cm×20cm copper plate is charged with 1.7×10^10 electrons. Consider the electrons are uniformly distributed on the surface. A. What is the strength of the electric field 0.1 mm above the center of the top surface of the plate? E=____
  92. Physics

    A 0.52kg mass at the end of a spring vibrates 4.0 times per second with an amplitude of 0.15m . a. Determine the velocity when it passes the equilibrium point. b.Determine the velocity when it is 0.12m from equilibrium c.Determine the total energy of the
  93. Physics

    A 100-g block hangs from a spring with k = 5.3 N/m. At t = 0 s, the block is 20.0 cm below the equilibrium position and moving upward with a speed of 194 cm/s. What is the block's speed when the displacement from equilibrium is 31.5 cm?
  94. Chemistry

    The pH of a weak monoprotic acid, HA, is 4.55. It took 39.22 ml of 0.2334 M NaOH to titrate 25.00 ml of the acid. a. Write an equation for the above reaction. b. Calculate the molarity of the weak acid c. Write the equilibrium equation. Construct a table
  95. chemistry

    A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A. some reactants and products with reactants slightly favored B. essentially all products C. essentially all reactants D. approximately equal
  96. chemistry

    A reaction with an equilibrium constant Kc = 1.5 x 1021 would consist of which of the following at equilibrium: A) approximately equal reactants and products B) some reactants and products with reactants slightly favored C) some reactants and products with
  97. Spanish

    7. ¿Cómo se dice en español: The hospital is far from the town? A.) El hospital está cerca del pueblo. B.) El hospital está lejos del pueblo. C.) El hospital está cerca de el pueblo. D.) El hospital está lejos de el pueblo. 8. ¿Cómo se dice en
  98. Physics

    Does it take twice the work to stretch a spring 2cm from its equilibrium position as it does to stretch it 1cm from its equilibrium position?
  99. Managerial Economics

    2)The manager of All City realtors wants to hire some real estate agents to specialize in selling housing units acquired by the Resolution Trust Commission (RTC) in its attempt to bail out the savings and loan industry. The commission paid by RTC to the
  100. Managerial Econ 2

    2)The manager of All City realtors wants to hire some real estate agents to specialize in selling housing units acquired by the Resolution Trust Commission (RTC) in its attempt to bail out the savings and loan industry. The commission paid by RTC to the