1. Physical science

    Consider the following reaction that occurs at STP:what mass of N2 gas is needed to react with 12g H2 gas?

    asked by Thandi faith mapili on September 2, 2015
  2. 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 20, 2018
  3. 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 30, 2011
  4. 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 2, 2009
  5. 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
  6. physical science

    In terms of energy, the general chemical equation AB+CD+energy = AD+CB represents a (an)_________ reaction.

    asked by Jason on January 30, 2013
  7. 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 9, 2013
  8. 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
  9. psychology

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

    asked by abigael gamboa on September 24, 2011
  10. 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
  11. 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 7, 2013
  12. 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
  13. 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
  14. 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 9, 2011
  15. 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 18, 2011
  16. chemistry

    39.3 grams of c6h6 are allowed to react with 108.3 grams of o2. How much co2 will be produced by this reaction?

    asked by Lindsey on May 26, 2015
  17. 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
  18. Chemistry

    Hydrazene can be used in fuel cell N2H4(aq)+o2(g)->N2(g)+2H2O(l) IfΔG°for this reaction is -600kj what will be the E°for the cell?

    asked by tanya on May 27, 2015
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. HELP!! PLEASE CHEM LAB

    When doing a titration, for example acid base, how do you know how much base to measure out and how much analyte to pour in the reaction flask?

    asked by che on December 1, 2015
  25. Chemistry

    10% of a sample reacts in 25 s. If the reaction follows first order kinetics, how long would it take for half the sample to react?

    asked by mandy on May 4, 2010
  26. College Chemistry

    The value of ΔG°f at 25°C for gaseous mercury is 31.85 KJ/mol. What is the vapor pressure of mercury at 25°C? [Hint: calculate the Kp for the reaction Hg(l)=Hg(g)]

    asked by alice on December 6, 2010
  27. chem

    write a mechanism for the reaction of sodium chloroacetate with 4-chlorophenolate. - i know its a sn2 mechanism, but I don't know who to go about from here

    asked by jason on January 30, 2009
  28. 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 4, 2010
  29. 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 28, 2007
  30. PLS HELP URGENT

    Only one of the following reactions occurs. HCl + F HF + Cl For the one that does occur which side is favoured? Explain WHY the other reaction will not occur.

    asked by Jules on May 27, 2014
  31. 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 12, 2013
  32. chemistry

    If 35 mL of H2SO4 is titrated to the equivalent pint with 45 mL of 0.30M NaOH, what is the molarity of the H2SO4 before and after the reaction?

    asked by Casey on April 12, 2017
  33. chemistry

    What type of chemical reaction is this equation? CuO (s) + [2H+ + SO4 2-](aq) [Cu2+ + SO4 2-] (aq) + H2O (l)

    asked by Anonymous on March 29, 2017
  34. physics!

    A soccer ball is kicked from the top of a 256 foot building with an initial velocity of 6 ft/s. What will the ball's velocity be at the instant before it strikes the ground?

    asked by carissa on October 20, 2008
  35. 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
  36. physics

    Farhan tosses a ball upwards with an initial velocity of 13.0 m/s. What is the direction of motion of the ball 2.4 seconds after he threw it? type "up" if it is moving up and "down" if it is moving down

    asked by Jean on August 26, 2011
  37. 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 15, 2018
  38. 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
  39. 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
  40. Algebra 1

    A ball is thrown into the air with the in initial upward velocity of 60 ft/s. It's height (h) in feet after t seconds is given by the function h=- -16t^2+60t+6. What will the height be at t=3 seconds?

    asked by Steve on February 11, 2015
  41. 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 27, 2010
  42. physics

    A man can throw a ball a maximum horizontal distance of 73.4 meters. the acceleration is 9.8 m/s^2. How far can he throw the same ball vertically upward at the same initial speed?

    asked by jay on October 30, 2017
  43. Physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 2.19 m/s. The angle of incline is θ = 25.1°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by Sara on March 31, 2016
  44. 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 9, 2012
  45. Physics

    Daniel tosses a ball upwards with an initial velocity of 10.0 m/s. In meters per second, what is the velocity of the ball 1.3 seconds after he threw it? (use 10.0 m/s2 for g and use the upward direction as positive)

    asked by Jen on January 12, 2012
  46. 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 6, 2011
  47. physics

    A van traveling down a slope with a uniform acceleration of 2.15 meters/second2 attains a speed of 20.00 meters/second after 7.00 seconds. What is the initial velocity of the van?

    asked by jason on December 18, 2012
  48. physics

    A ball is dropped from a cliff and 2 seconds later, a second ball is thrown vertically downward. What must be the initial velocity of the second ball if it overtakes the first ball as it passes 400m ?

    asked by Rob on July 26, 2017
  49. 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 9, 2012
  50. SCIENCE

    A cyclist maintains a constant velocity of 5.2 m/s headed away from point A. At some initial time, the cyclist is 257 m from point A. What will be his displacement from his starting position after 47 s?

    asked by ANN on September 13, 2011
  51. 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
  52. 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
  53. 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
  54. 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
  55. physics

    A van traveling down a slope with a uniform acceleration of 2.15 meters/second2 attains a speed of 20.00 meters/second after 7.00 seconds. What is the initial velocity of the van?

    asked by jasmine on July 9, 2012
  56. 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 17, 2012
  57. 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 31, 2012
  58. Physics

    A box weighing 178N slides down a ramp with an initial velocity of 0.5m/s^2. The ramp has an angle of 24 degrees and is 3m long. What is the acceleration of the box? I know that F=ma but how do I find a?

    asked by Juan on November 9, 2014
  59. 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
  60. 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
  61. 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
  62. Physics

    An ice skater is gliding along at 2.1 m/s , when she undergoes an acceleration of magnitude 1.4 m/s2 for 3.0 s. After that she's moving at 6.3 m/s . Find the angle between her acceleration vector and her initial velocity vector.

    asked by Megan on April 8, 2016
  63. 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
  64. finance

    You have an investment opportunity which yields 9% per year. About how many years will it take your initial investment of $10,000 to grow to a total of of $40,000? Please give your answer as a whole number

    asked by Qoo on April 28, 2012
  65. Algebra

    A ball is thrown into the air with an initial upward velocity of 60 ft/s. Its height (h) in feet after t seconds is given by the function h = –16t² + 60t + 6. What will the height be at t = 3 seconds? A) 3 B) 4***** C) 5 D) 6

    asked by Nina on April 11, 2017
  66. 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 22, 2009
  67. 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
  68. 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
  69. 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
  70. physics

    A 3.4-kg box is released on a horizontal surface with an initial speed of 4.8 m/s. It moves on the surface with a deceleration of 0.45 m/s2. Calculate the kinetic friction force on the box.

    asked by Robert on January 3, 2012
  71. 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
  72. 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
  73. 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 14, 2010
  74. 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 9, 2012
  75. Dynamics

    A stone is projected in the air vertical upward with an initial velocity of 5m/s Find a) tr and tf b) H, highest distance has reached c) where is the stone has reached after t=5.0sec

    asked by Jason on May 10, 2017
  76. 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 16, 2014
  77. 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
  78. 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 15, 2013
  79. 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+32t+560.

    asked by Davone on April 13, 2014
  80. 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
  81. 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
  82. physics

    Daniel tosses a ball upwards with an initial velocity of 10.0 m/s. In meters/second, what is the velocity of the ball 1.3 seconds after he threw it? (use 10.0 m/s2 for g and use the upward direction as positive)

    asked by Anonymous on January 12, 2012
  83. 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 28, 2016
  84. Physics

    If a body is projected vertically up it's velocity decreases to half of its initial velocity at a height 'h' above the ground The maximum height reached by it is Ans:4h/3

    asked by Thousif on October 5, 2017
  85. physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 8.42 m/s. The angle of incline is è = 58.4°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by Sam on October 10, 2010
  86. 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
  87. physics

    Daniel tosses a ball upwards with an initial velocity of 10.0 m/s. In meters/second, what is the velocity of the ball 1.3 seconds after he threw it? (use 10.0 m/s2 for g and use the upward direction as positive)

    asked by Jen on January 12, 2012
  88. physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 8.42 m/s. The angle of incline is è = 58.4°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by daisy on October 9, 2010
  89. Physics

    A book is launched up a frictionless ramp that has an angle of 35 degrees to the horizontal.If the Book's initial speed is 2.0 m/s^2 , how far up the ramp does it slide? I got 15.24. Any help would be greatly appreciated.

    asked by Harold on February 10, 2009
  90. Physics

    A cannonball is fired with initial speed v0 at an angle 30° above the horizontal from a height of 42.9 m above the ground. The projectile strikes the ground with a speed of 1.2v0. Find v0.

    asked by Nicole on January 31, 2016
  91. physics

    Daniel tosses a ball upwards with an initial velocity of 10.0 m/s. In meters/second, what is the velocity of the ball 1.3 seconds after he threw it? (use 10.0 m/s2 for g and use the upward direction as positive)

    asked by Anonymous on January 12, 2012
  92. 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
  93. chem

    for solutions of a weak acid, a graph of pH versus the logarithm of the initial acid concentration should be a straight line. What is the magnitude of the slope of that line?

    asked by greeny on July 4, 2012
  94. 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 25, 2017
  95. physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 1.92 m/s. The angle of incline is è = 12.2°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by jessy on October 11, 2010
  96. 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
  97. physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 8.42 m/s. The angle of incline is è = 58.4°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by koraile on October 9, 2010
  98. 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
  99. 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
  100. physics

    A block is projected up a frictionless inclined plane with initial speed v0 = 8.42 m/s. The angle of incline is è = 58.4°. (a) How far up the plane does it go? (b) How long does it take to get there? (c) What is its speed when it gets back to the bottom?

    asked by katherine on October 9, 2010