1. chemistry

    What is the oxidizing agent in the following reaction? Cl2 (g) + 2Na+ (aq) + 2Br- (aq) --> 2Na+ (aq) + 2Cl- (aq) + Br2 (l)

    asked by mary on November 8, 2011
  2. Chemistry

    if the rate of a certain reaction is 6M/hr at 273K, what would be the predicted rate at 278k with activation 30kj/mol

    asked by Anonymous on August 11, 2015
  3. CHEMISTRY

    AT A CERTAIN TEMPERATURE, THE REACTION CO(g) + 2H2(g) CH3OH (g) has Kc = 0.500 CO= 0.180 M H2= 0.220 M WHAT IS THE CONCENTRATION OF CH3OH?

    asked by HELP IM LOST on October 15, 2011
  4. Chemistry- Stoichiometry

    "Why must a chemical reaction be balanced before it can be used in stoichiometry?" I mean, I get it, that the equation will be off if it doesn't start out balanced, but, why? How do I phrase that?

    asked by Shelby on September 27, 2007
  5. science- chemistry

    what is the rate of reaction, if rate of consumption of iodide is 2.130x10^-5? 5I-(aq)+IO3-(aq)+6H+(aq) 3I2(aq)+3H2O(l)

    asked by pookie on May 10, 2010
  6. ap chemistry

    Under certain conditions, the reaction 3A + 2B -> 4C was observed to proceed at a rate of 0.00348 M· s−1. What was the corresponding rate of change in reactant A?

    asked by gabriella on November 6, 2013
  7. Chemistry

    What data do you need to determine whether the following reaction is spontaneous or not? 4Fe(s) + O2(g) ----> 2Fe2O2(s) Would it be temperature, delta H and delta S?

    asked by Sharkeisha on August 5, 2015
  8. chemestry

    How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

    asked by richard on February 27, 2013
  9. physical chemistry

    the rate constant for a reaction at 30 degrees is found to be exactly twice the value at 20 degrees. calculate the activation energy

    asked by ntsika on March 14, 2016
  10. psychology

    a defense mechanism is an unconscious reaction used to protect the mind? true or false ,true right

    asked by M on August 23, 2008
  11. Chemistry

    Calculate ∆Ssurr when a reaction having each of the following changes in enthalpy: a. ∆Hrxn0 = -287 kJ; 298 K. b. ∆Hrxn0 = 127 kJ; 77 K.

    asked by Melanie on April 18, 2013
  12. chemistry

    Consider the following reaction: 2 B5H9 + 12 O2 => 5 B2O3 + 9 H2O How many grams of O2 are needed to make 432.7 g of H2O?

    asked by michelle on November 16, 2014
  13. Chemistry

    Consider the reversible reaction: A(g)-2B(g)At equilibrium, the concentration of A is 0.381 M and that of B is 0.154 M. What is the value of the equilibrium constant, Keq?

    asked by Chemistry Chick on November 29, 2011
  14. chem

    Sb2S3(s) + 3 Fe(s) 2 Sb(s) + 3 FeS(s) When 14.7 g Sb2S3 reacts with an excess of Fe, 9.84 g Sb is produced. What is the percent yield of this reaction? %

    asked by Anonymous on February 9, 2012
  15. Chemistry

    A cell has a standard emf of +0.177 V at 298 K. What is the value of the equilibrium constant for the cell reaction a) if n=1? b) if n=2?

    asked by Summer on April 8, 2013
  16. chemistry

    How many grams of O2 are needed to produce 45.8 grams of Fe2O3 in the following reaction? 4Fe(s)+3O2(g) - 2Fe2O3(s)

    asked by richard w on February 27, 2013
  17. chem

    What happens to a catalyst in a reaction? a. it remains unchanged b. it is incorporated into the products c. it is incorporated into the reactants d. it evaporates

    asked by Terri on December 30, 2011
  18. English

    where can i find information on The Most Hateful Words by Amy Tan? Information such as a summary or reaction about it

    asked by Bryan on October 22, 2008
  19. Chemistry

    What is the theoretical yield of ethyl chloride in the reaction of 19.2g g of ethylene with 48g g of hydrogen chloride?

    asked by Allison on November 3, 2013
  20. chemistry

    Write down a balanced acid-base reaction given the following reactants Reactants: NaOH(aq) + HCl(aq)

    asked by jonh on February 10, 2011
  21. Chemistry 104

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie on May 3, 2013
  22. chemistry

    How many moles of H2S would we expect to be formed by reaction if 3.50 moles of HNO3 reacted completely?

    asked by wendy on February 9, 2015
  23. science

    Proper condition for maximum yei of so3 in reaction 2so2+o2=so3+HEAT

    asked by muna on February 6, 2017
  24. Chemistry 104 PLEASE HELP ME!!

    Calculate Eo (reduction potential) for the following balanced reaction. NiO2 + 2H2O + 2Fe(OH)2 Ni(OH)2 + 2Fe(OH)3

    asked by Sophie on May 3, 2013
  25. chemistry

    the value of ΔH° for the reaction of 2 C6H6 (l) + 15 O2 (g) = 12 CO2 + 6H20 is -6535 kJ. how many kJ of heat are released in the combustion of 16.0 g of C6H6 (l) ?

    asked by Agnes on March 5, 2012
  26. chemistry

    the value of ΔH° for the reaction of 2 C6H6 (l) + 15 O2 (g) = 12 CO2 + 6H20 is -6535 kJ. how many kJ of heat are released in the combustion of 16.0 g of C6H6 (l) ?

    asked by Agnes on March 5, 2012
  27. chemistry

    How many mL of 0.40M NaOH are need to neutralize 30.0 mL of 0.50 M H2SO4 according to the following reaction. 2NaOH(aq) + H2SO4 (aq)----Na2SO4 (aq) + 2H2O(l)

    asked by Sara on March 20, 2013
  28. Chem

    What determines whether 2-bromobutane undergoes an Sn1 or an Sn2 reaction how would you favor SN2 formation?

    asked by Jason on November 17, 2008
  29. Chemistry

    Once it is balanced, in the following chemical reaction NaHCO3(s) Na2O(g) + CO2(g) + H2O(l), what is the coefficient for Na2O (s)? a. 1 b. 2 c. 3 d. 4

    asked by Pennelope on November 1, 2009
  30. Chemistry

    If you begin with 34.4 grams of ammonia how many grams of hydrogen and nitrogen can you produce in a decomposition reaction

    asked by Kyla on February 13, 2017
  31. Chemistry

    How has the equilibrium been modified in Haber Process? what is the heat value for the following exothermic reaction : Hb(aq) + O2(aq) = HbO2(aq) + (Heat ?)

    asked by krish on November 28, 2011
  32. farewell to arms english

    What is cathirines first reaction when she learns that henry is in the italian army?what was her decription of the italian front?

    asked by taianna holguin on December 19, 2009
  33. Chemistry-Stoichiometry

    what is the limiting reactant if 0.10 moles Fe and 0.16 moles O2 react according to the reaction 4Fe +3O2 -> 2Fe2O3?

    asked by Barbara on October 19, 2013
  34. psychology

    reaction paper about the door to door movie? true story by bill porter

    asked by abigael gamboa on September 24, 2011
  35. Chemistry

    How many grams of dichloromethane are formed from 1500.0 grams of methane, it the percent yield for the reaction is 82.5%?

    asked by Melissa on November 24, 2017
  36. Chem

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked by Mike on April 6, 2010
  37. chem

    determine how many grams of N2 are produced from the reaction of 8.75 g of H2O2 and 5.43 g of N2H4. 2H2O2+N2H4 4H2O+N2 g N2?

    asked by Rachel on February 19, 2018
  38. chemistry

    Explain how mixing red paint and white paint could be used as an analogy for a neutralization reaction.

    asked by Anonymous on October 18, 2012
  39. CHEM

    A reaction of 48.5 g of Na and 53.7 g of Br2 yields 55.4 g of NaBr. What is the percent yield? 2Na+Br2 2NaBr

    asked by Rachel on February 19, 2018
  40. chemistry

    Co2(aq)->Co2(g) calculate the free-energy change for this reaction at 25 degrees Celsius.

    asked by mar on February 1, 2015
  41. chemistry

    If 6.30 moles of C5H12 reacts with excess O2, how many moles of CO2 will be produced in the following combustion reaction?

    asked by Natalie on October 15, 2015
  42. A & M

    how many grams of CaO are required for complete reaction with the HCl in 275mL of a 0.523 M HCl?

    asked by Roxie on July 29, 2010
  43. Chemistry

    Hi, i would like to know how hydrogen can be manufactured from methane using a nickel catalyst. What must be added to methane in the reaction? +Ni CH4 + ??? -----> H2 + ???

    asked by Monica on September 23, 2009
  44. Chemistry

    A reaction uses 4.5 grams of oxygen and an excess of nitrogen. How many grams of dinitrogen pentoxide are produced?

    asked by Billy on October 7, 2014
  45. chemistry

    in reaction S + O2 -> SO2, determine percent yield if 4 grams of S produced 64 gram of SO2

    asked by Fakhry on February 13, 2013
  46. chemistry

    C3H8+5 o2 - 3CO2 +4H2O the reaction If I have 56.7 liters of o2 reacted, how many liters of H2O were produced?

    asked by kia on May 6, 2016
  47. Biology

    In the following chemical reaction, what is carbon dioxide (CO2)? 12 H20 + 6 CO2 -> 1 glucose molecule + 6 O2

    asked by Michelle on March 2, 2009
  48. Chemistry

    Calculate the temp at which DG for a reaction (with/ DH= -19.9 kJ/mol and DS= -55.5 J/k-mol) will be equal to 0. Is the correct answer -358.56 K?

    asked by Anonymous on April 11, 2010
  49. Chem II

    For the reaction H2+I2, Kc=55.3 at 700K. In a 2. L flask containing an equilibrium mixture of three gases, there are .056g H2 and 4.36 g I2. What is the mass of the I2 in the flask?

    asked by Jeff on January 31, 2011
  50. Chemistry

    Which reaction had a negative T value: Citric Acid and baking soda or metal and hydrochloric Acid

    asked by Anonymous on February 4, 2012
  51. Chemistry

    In this reaction, 4.58 L of O2 were formed at 745mm Hg and 308 K. How many grams of Ag2O decomposed. 2 Ag2O----> 4 Ag + O2 Please help I'm very confused

    asked by Monique on October 17, 2011
  52. Chemistry

    Consider the Unbalanced Reaction: Al2O3(s) + CO(g) → Al(s) + CO2(g) Estimate ∆G at 298 K if 7.1 moles of Al2O3(s) is reacted.

    asked by Zachary on July 4, 2017
  53. chemistry

    same question as before What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030M ? CaCO3(s)⇌CaO(s)+CO2(g)

    asked by anynomous on November 11, 2013
  54. CHEM

    How many liters of O2 will react with 100 liters of H2 according to the gas phase reaction: O2 + 2H2 ------2H2O

    asked by MICHELLE on May 3, 2013
  55. chemistry

    Calculate ΔG for this reaction under the following conditions (assume an uncertainty of ±1 in all quantities). Assume that ΔH° and ΔS° do not depend on temperature.

    asked by Sarah on May 1, 2012
  56. Chemistry

    Draw the product(s) of the following reaction CH3-CH2-C(triple bond)C-CH2 ---------> ? (Na/NH3)

    asked by anon on October 27, 2016
  57. chemistry

    how many moles of oxygen (molecule) are required for complete reaction with 2.1080 moles of iron?

    asked by Anonymous on September 26, 2010
  58. Chemistry

    3O2(g)---> 2O3(g) At a given instant, the reaction rate in terms of [O2] is 2.17x10^-5 mol/L*s. What is it in terms of O3?

    asked by Amy on April 3, 2010
  59. Chem

    A reaction of 48.5 g of Na and 53.7 g of Br2 yields 55.4 g of NaBr. What is the percent yield? 2Na(s)+Br2(g)--->2NaBr(s)

    asked by sarah on February 11, 2018
  60. CHEM

    Consider the reaction, 3 NO2(g) + H2O(l) ® 2 HNO3(aq) + NO(g), where DH = – 137 kJ. How many kilojoules are released when 92.3 g of NO2 reacts?

    asked by jerry on March 21, 2012
  61. Chemistry

    The Ka value of nitrous acid, HNO2 , is 4.0 × 10¯4 . What is the equilibrium constant for the reaction; NO2¯ + H2O HNO2 + OH¯ ?

    asked by Thomas on February 17, 2011
  62. Chemistry

    What is the percentage yield for a reaction if you predicted the formation of 21 grams of C6H12 and actually recovered only 3.8 grams?

    asked by Sharon on March 8, 2015
  63. Chemistry

    What is the mass, in grams, of NaCl formed from the reaction of 2.75 mL of a 6.00 M Na2SO4 solution and 8.30 mL of 2.5 M solution of HCl?

    asked by Jane on November 23, 2011
  64. Physics

    A bear running initial speed of 4m/s accelerates uniformly for 18s. What is the bears max speed if it travels 135m during the 18s of acceleration

    asked by Me on September 11, 2013
  65. chemistry

    molar enthalpy of combustion for pentane? Mass C5H12= 2.15g Mass H2O= 1.24kg Initial temp= 18.4°C Final temp= 37.6°C

    asked by shyanne on January 10, 2013
  66. phyisics

    A 0.5kg object is given an initial velocityof 3m/s after when it slides a distance of 8m across a level floor whatis the coefficient of kinetic friction between the object and the floor

    asked by king david on January 22, 2017
  67. calculus

    Assume a substance has a half-life of 11 years and the initial amount is 144 grams. How much remains at the end of 5 years? How long will it be until only 30 % remains?

    asked by nick on September 14, 2010
  68. algebra

    A ball has been hit with an initial velocity of 24.5 m/sec from a height of 5.375 meters off the ground. Write an equation that models the height of the ball.

    asked by Holly on January 5, 2011
  69. Please help me with M1 kinematics!

    A particle is travelling with velocity (4i+5j)m/s. It undergoes an acceleration of magnitude 2.5m/s^2 in a direction given by the vector (3i-4j). Find the velocity and displacement of the particle from its initial position after 4s.

    asked by Jat on February 26, 2012
  70. PHYSICSS

    A block is projected up a frictionless inclined plane with initial speed v1 = 3.40 m/s. The angle of incline is è = 31.1°. (a) How far up the plane does it go?(m) (b) How long does it take to get there? (s) (c) What is its speed when it gets back to the

    asked by ashley on October 3, 2010
  71. physics

    A proton (mass ) is being accelerated along a straight line at in a machine. If the proton has an initial speed of and travels 3.5 cm, what then is (a) its speed and (b) the increase in its kinetic energy?

    asked by beav on February 26, 2010
  72. physical sciences

    during the takeoff roll, a boeing 747 jumbo jet is accelarating at 4m\s. it requires 40 s to reach takeoff speed. what is the initial velocity of the jet?

    asked by sam on March 30, 2017
  73. physics

    A ball bounces off the edge of a table at an initial velocity of 1.5 m/s at an angle of 30 degrees above the table, falling to the floor 75 cm below. How long will the ball be in the air?

    asked by Camden on October 27, 2016
  74. Pre-Calc/Trig...

    A ball is thrown upward with an initial velocity of 4ft/sec from a height of ten feet. what is the maximum height that the ball will reach. h(t)= -16+vt+s

    asked by Anonymous on October 15, 2014
  75. chemistry kinetics

    Decomposition of an organic compound A follows first order kinetics. Initial concentration of A is 2 M. If rate constant of the decomposition is 3.58 × 10^−6 min^-1 , calculate the rate after 3 hours.

    asked by swa on May 24, 2012
  76. Pre- Caluculus

    Find the time at which the depth of the water in the tank is eual to half its initial depth. D(t)=sqrt(100-2t) the tank is empty when t=50 min

    asked by DJ on October 21, 2009
  77. math

    a boat travels 60 km due east. it then adjusts its course by 25 degrees northward and travels another 90 km in the new direction. how far is the boat from its initial position to the nearest kilometer?

    asked by Anonymous on June 16, 2012
  78. mathematical physics

    Obtain the temperature distribution u(x,t) in a literally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u( x, 0 ) = 6sin[πx/L]

    asked by gourav on March 28, 2015
  79. physics

    A 0.23 kg ball of dough is thrown straight up into the air with an initial velocity of 12 m/s.Find the momentum of the ball of dough halfway to its maximum height on the way up.

    asked by Chris on March 15, 2012
  80. math

    a boat travels 60 km due east. it then adjusts its course by 25 degrees northward and travels another 90 km in the new direction. how far is the boat from its initial position to the nearest kilometer?

    asked by kennisha on June 16, 2012
  81. mathematical physics

    Obtain the temperature distribution u(x,t) in a laterally insulated rod of length L if both ends on the road are kept at 0°c and the initial temperature distribution in the bar is: u(x,0) = 6sin[πx/L]

    asked by gourav on March 27, 2015
  82. Physics

    A particle leaves the origin with an initial velocity = (6.91 ) m/s and a constant acceleration = ( - 2.38 - 2.79 ) m/s2. When the particle reaches its maximum x coordinate, what are (a) its velocity, (b) its position vector?

    asked by Antonio on September 13, 2010
  83. Chemistry

    if 3.00 g of iron metal are reacted in a calorimeter with a heat capacity of 500 J/ degrees Celsius, what would be the final temperature of the calorimeter if its initial temperature were 23.0 C?

    asked by Gabby on November 7, 2012
  84. Chemistry

    if 3.00 g of iron metal are reacted in a calorimeter with a heat capacity of 500 J/ degrees Celsius, what would be the final temperature of the calorimeter if its initial temperature were 23.0 C?

    asked by Gabby on November 7, 2012
  85. physics

    A cyclist maintains a constant velocity of 4.1 m/s headed away from point A. At some initial time, the cyclist is 244 m from point A. What will be his displacement from his starting position after 60 s?

    asked by Rachel on October 10, 2014
  86. Physics

    A brick is thrown upward from the top of a building at an angle of 30° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 3.2 s, how tall is the building? ___m

    asked by jc on September 21, 2010
  87. college algebra

    A rocket is fired upward from some initial distance above the ground. Its height in​ feet, h,above the​ ground, t seconds after it is​ fired, is given by h=−16t^2+64t-3072

    asked by marie on March 24, 2017
  88. physics

    A 2.7-kg box is released on a horizontal surface with an initial speed of 2.9 m/s.It moves on the surface with a deceleration of 0.27 m/s^2.Calculate the kinetic friction force on the box

    asked by Naesha on March 13, 2013
  89. Trigonometry

    A ball is thrown with an initial velocity of 65 feet per second, at an angle of 55° with the horizontal. Find the horizontal component of the velocity. Round to two decimal places.

    asked by Anonymous on June 18, 2011
  90. math

    ball thrown up from top of 96 foot high tower with initial velocity of 80 ft/s. when does ball reach max height and how high is it at that time?

    asked by BK on October 10, 2011
  91. Math

    Use the initial condition y(0)=4 and step size h=.25, calculate the backward Euler on [0,1] for the ODE y'=10y-10y^2. Solve the ODE exactly and compute the errors at t=1.

    asked by Ashley on March 25, 2015
  92. Physics

    A baseball is thrown straight up on the Moon with an initial speed of 28 m/s. Find the time it takes for the baseball to reach the maximum height. On the moon g = 1.6 m/s2

    asked by GraceW1 on September 8, 2015
  93. Physics

    An astronaut jumps on the moon with an initial upward velocity of 4.35m/s. If the acceleration of gravity on the moon is -1.62m/s^2, what is the max height of the astronaut?

    asked by Toni on October 21, 2014
  94. Math

    A projectile is launched from a cannon that sits 4 feet off the ground at an initial velocity of 120 feet/sec. Find the impact velocity.

    asked by Kristen on November 14, 2013
  95. physics

    you throw a ball from a cliff with an initial velocity of 15m/s at an angle of 20° below the horizontal.find(a) its horizontal displacement and(b) its vertical displacement 2.3sec later?

    asked by maaz on October 2, 2015
  96. Physics

    A shell is fired horizontally and takes .5 seconds to fall. If its initial speed were doubled, the time it would take to fall would be: .25 seconds I know the answer, but I need an explanation if possible.

    asked by lance on October 3, 2007
  97. Calculus

    Using separation of variables, solve the following differential equation with initial conditions dy/dx = e^(2x+3y) and y(0) = 1. Hint: use a property of exponentials to rewrite the differential equation so it can be separated

    asked by Nick on August 14, 2018
  98. Chemistry

    a sample of gas is warmed from 15.o degrees celsius to 45.o celcius at a constant pressure. its initial volume is 1.75 liters. what is the final volume of gas?

    asked by Adina on May 3, 2010
  99. physics

    the force acts on a 50g ball varies with time.if the initial velocity of the particles is 20m/s.what is the average acceleration of ball during this time?

    asked by jumana on January 8, 2012
  100. Physics

    The initial velocity of a 2.04 kg block sliding down a frictionless inclined plane is found to be 1.24 m/s. Then 1.23 s later, it has a velocity of 6.70 m/s. What is the angle of the plane with respect to the horizontal? im lost.....

    asked by Bruce on January 30, 2012