1. Chemistry

    Given the reaction: Ni (s) + 4 CO (g)  Ni(CO)4 (g) E = –154 kJ, how many kilograms of CO are required for this reaction to release 756 kJ of energy?

    asked by justin on August 20, 2013
  2. Chem II

    A first-order reaction is 35.5% complete in 4.90 minutes. The rate constant of the reaction is _____

    asked by Ken on June 13, 2008
  3. chemistry

    Balance the following redox reaction using the half reaction method: NaIO3+KI==> I2+H20+Na(+1)+K(+1)

    asked by steve on November 8, 2011
  4. chemistry

    Consider the reaction Select a possible mechanism for the reaction. Step1:2X2Y+Z2→2X2YZ (slow)

    asked by Tayebeh Asadi on January 29, 2016
  5. gr 12 chemistry

    write an equation for a reaction involving an aldehyde to illustrate a hydrogenation reaction.

    asked by shelly on March 2, 2010
  6. college

    For the reaction P4(s) + O2(g) = P4 O10(s) Identify the limiting reaction mixture conataining 1.00 mol each of P4 and O2

    asked by Al on March 10, 2010
  7. chemistry

    a first order reaction has a rate constant of 7.5 x 10^-3/s. The time required for th reaction to be 60% complete is

    asked by Angel on June 17, 2008
  8. biochemistry

    The ΔG¡' of the reaction is -5.31 kJ ámolÐ1. Calculate the equilibrium constant for the reaction. (Assume a temperature of 25¡ C.)

    asked by stoic-rider77 on February 3, 2013
  9. Chemistry

    Balance the redox reaction below using the half-reaction method. Bi3+(aq) + Co(s)Bi(s) + Co2+(aq)

    asked by Shahzaib on November 21, 2015
  10. Chemistry

    For the following redox reaction, give the complete reduction half reaction. Na(s) + Al+3(aq) Na+1(aq) + Al(s) Please help asap!!

    asked by Rae on November 10, 2016
  11. Chem II

    The reaction A -->B---> C is called a _______ reaction? Consecutive parallel competing stepwise

    asked by Ken on June 13, 2008
  12. Chemistry

    Explain, in terms of collision theory, how and why a reaction’s rate changes as the reaction progresses.

    asked by nan on March 4, 2016
  13. science

    2KClO3 - 2KCl + 3O2 is formed ! now which kind of reaction is this ? and how can i say it is that particular reaction took place here?

    asked by arvaz on June 23, 2017
  14. 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 3, 2014
  15. Physics

    A projectile, fired with unknown initial velocity, lands 20.8 s later on the side of a hill, 2900 m away horizontally and 411 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 September 5, 2012
  16. 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 3, 2014
  17. Chemistry - Rates

    For a particular reaction, the rate constant is 2.32 ✕ 10−3 M/s at 185°C and 3.70 ✕ 10−3 M/s at 235°C. What is the activation energy for this reaction? _______ kJ/mol

    asked by Jamie on September 14, 2017
  18. Chemistry

    Half reaction method of balancing redox reaction CHCl3 + MnO4- = Cl2 + CO2 + Mn+2

    asked by Maria on September 15, 2016
  19. Chemistry

    At a certain temperature, the reaction has Kc = 5 x 108. If a reaction mixture at equilibrium contains 0.26 M of H2 and 0.087 M of Cl2, what is the concentration of HCl?

    asked by Em on March 26, 2016
  20. Chemistry

    Al(s) + MnO2(s) → Al2O3(s) + Mn(s) When this reaction is balanced, how many electrons are transferred in each half-reaction? The answer I got is 3*2=6. Is this correct?

    asked by Summer on April 5, 2018
  21. CHEM

    How are the forward and reverse rate constants for a one-step reaction related to the equilibrium constant for the reaction? A)Kc = kf x kr B) Kc = kf - kr C) Kc = kf + kr D) Kc = kf/kr

    asked by Adam on May 29, 2010
  22. Chemistry

    At a certain temperature, the reaction has Kc = 5 x 108. If a reaction mixture at equilibrium contains 0.26 M of H2 and 0.087 M of Cl2, what is the concentration of HCl?

    asked by Anonymous on March 26, 2016
  23. chemical

    how to obtain the kinetic data for this reaction 2NO3+2H2>2H2O+N2 HOW TO PERFORM THIS REACTION IN LAB.

    asked by assia on April 19, 2010
  24. Chemistry - Science (Dr. Bob222)

    Consider reaction below: 50H3O^+(aq) + 7Cr2O7^2-(aq) +3I_2(aq) --> 6IO_4^-(aq) + 14Cr^3+(aq) + 75H2O (l) How many electrons are transferred in this reaction?

    asked by Adrik on April 14, 2014
  25. chemistry

    Consider the following reaction: 3C(s) + 4H2(g) -> C3H8(g); DH° = –104.7 kJ; DS° = –287.4 J/K at 298 K What is the equilibrium constant at 400.0 K for this reaction?

    asked by Anonymous on May 3, 2010
  26. Dr.Bob222 Chem

    I believe that you are correct because you have more experience in G-chem then I have. But how does doubling the reaction rate double the k value? Isn't k just a constant for a particular reaction?

    asked by Devron on February 2, 2013
  27. chemistry

    CO2 + 3H2 equilibrium CH4 + H2O what is the forward and reverse reaction for it? what are the units of Kc for this reaction?

    asked by haseeb on May 16, 2015
  28. Chemistry

    For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.

    asked by Sarah on April 14, 2014
  29. Chemistry

    A certain reaction has an activation energy of 37.30 kj/mol. At what Kelvin temperature will the reaction proceed 3.00 times then it did at 303 k?

    asked by Josh on July 17, 2011
  30. chemistry

    Which element is reduced in the unbalanced reaction below? I− + MnO4− + H+ = I2 + MnO2 + H2O I no reduction occurred in this reaction O H Mn

    asked by danny on April 16, 2015
  31. chemistry

    what gas is produced in the reaction between calcium carbide and water?write the balanced equation for the reaction.

    asked by denis on November 22, 2011
  32. Chemistry

    The reaction N2(g)+3H2(g)2NH3(g) begins with 1.15 M N2 and 1.36 M H2. At equilibrium the concentration of NH3 is 0.78 M. Determine the extent of reaction.

    asked by Sara on May 11, 2015
  33. chemistry

    consider the reaction in which 410g of Ca(NO3)2 react with just the right amount of lithium metal in a single replacement reaction ?

    asked by obi on December 4, 2010
  34. Chemistry

    Given the balanced equation representing a reaction: 2CO(g)+O2(g)-->2CO2(g) what is the mole ration of CO(g) to CO2(g)in this reaction? (1)1:1 (2)1:2 (3)2:1 (4)3:2

    asked by lisa fortuna on January 3, 2011
  35. Chemistry quistion help!

    I need help answer this question for a chemistry homework. What are the products in a reaction between an acid and a base? How can you tell that a reaction has occurred?

    asked by Lisa on April 2, 2008
  36. physical science

    the influence of the magnitude of the surface area on the rate of reaction of a specific reaction using rennies tables

    asked by de kuilen on February 11, 2011
  37. physics

    Refering to reaction 2 H2(g) + O2(g) -> 2 H2O(g) and proving that the law of conservation of mass is obeyed during a chemical reaction.

    asked by Belly.L on March 2, 2012
  38. Kinetics Problem II

    The data below were collected for the following reaction: 2NO2 (g) + F2 (g) ->2NO2F(g) A: Calculate the value of the rate constant, k. B: What is the overall order of the reaction?

    asked by Amy on January 30, 2013
  39. chemistry

    A reaction rate increases by 60.3% when the temperature is increased from 21.5 to 35.6°C. Calculate the activation energy (in kJ/mol) for the reaction.

    asked by matt on March 24, 2008
  40. chemistry

    does a fission reaction release one-fourth of the amount of energy released ina fusion reaction?

    asked by Anonymous on June 7, 2011
  41. chemistry

    The reactant concentration in a second-order reaction was 0.790 after 200 and 8.80×10−2 after 740 . What is the rate constant for this reaction?

    asked by Anonymous on May 20, 2012
  42. chem

    what test will you perform to determine when you have added sufficient NaOH solution to the reaction mixture in reaction 2

    asked by erlicia on September 29, 2010
  43. chemistry

    Consider the reaction between hydrogen and oxygen gases to form water: 2H2(g) + O2(g) ¨ 2H2O(l) Which of the following is not conserved in this reaction?

    asked by amanda on October 1, 2013
  44. Chemistry

    How much heat (in kilojoules) is released on reaction of 4.10 g of Al? Reaction: 2Al(s) + 3Cl2(g)--->2AlCl3(s) Delta H= -1408.4 KJ

    asked by Jackie on February 17, 2010
  45. chem

    what test will you perform to determine when you have added sufficient NaOH solution to the reaction mixture in reaction 2

    asked by erlicia on September 29, 2010
  46. chemistry

    Consider the following reaction: 2 Mg + O2 → 2 MgO △H rxn = -1203 kJ Calculate the amount of heat (in kJ) associated with complete reaction of 4 moles of Mg.

    asked by katia on December 6, 2015
  47. chemistry

    Sodium nitrate reacts with copper (II) hydroxide. I know how to write it down: NaNo3+CuOH2----> NO REACTION The problem is that I don't understand why it's no reaction I know it's double replacement and we have to look at activity series of metal to figure

    asked by sakura on February 27, 2015
  48. Physics

    Sphere W (with an initial charge of zero) is touched to sphere A and then they are separated. Next, sphere W is touched to sphere B (with an initial charge of -26e) and then they are separated. Finally, sphere W is touched to sphere C (with an initial

    asked by Phil on January 19, 2012
  49. chem

    For the gaseous equilibrium represented below, it is observed that greater amounts of PCl3 and Cl2 are produced as the temperature is increased. PCl5(g) PCl3(g) + Cl2(g) a) What is the sign of S° for the reaction? Explain. b) What change, if any, will

    asked by Luke on April 29, 2008
  50. chemistry

    an ideal gas in a sealed container has an initial volume of 2.70L. at constant pressure, it is cooled to 25.00 C where its final volume is 1.75L. what was the initial temperature?

    asked by Anonymous on September 18, 2013
  51. physics

    Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?

    asked by anders on May 27, 2015
  52. physics

    a golf ball is launched at a 37 degree angle from the horizontal at an initial velocity of 48.6 m/s. state the initial velocity in rectangular coordinates. please show me how to figure this out

    asked by aimee on June 24, 2011
  53. physics

    An object of mass m moving with initial speed of 15 m/s got an acceleration of 10 m/s^ after a constant force F is applied to it. How long does it take for the object to reach 90 meters from its initial position?

    asked by Abdela said yimer on January 28, 2012
  54. AP physics

    A particle of mass 3.00 kg is projected vertically upward with an initial velocity of 20.0 m/s. Neglecting air resistance, the particle’s kinetic energy when it is 20 m above the initial position is:

    asked by ali on December 12, 2014
  55. physics

    Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?

    asked by anders on May 27, 2015
  56. pressure

    an ideal gas in a sealed container has an initial volume of 2.70L. at constant pressure, it is cooled to 25.00 C where its final volume is 1.75L. what was the initial temperature?

    asked by Anonymous on September 18, 2013
  57. Physics

    The mens world record for the shot put, 23.12 meters. if the shot was launched from 6 feet above the ground at an initial angle of 42 degrees, what was the initial speed?

    asked by Alyssa on November 29, 2009
  58. chemistry

    If you had left your copper(II) nitrate/potassium hydroxide precipitate stand for a while, the precipitate would turn into a black powder. The copper doesn’t reduce in this reaction, but one mole of water is produced from the reaction of one mole of the

    asked by Cortney on April 24, 2015
  59. SCIENCE

    I mix 300.0ml of the barium nitrate solution from 1c with 100ml of a 1.50M lithium phosphate solution. The reaction produces solid barium phosphate a. Write a balanced equation for the reaction. b. Which is my limiting reagent? c. How much barium phosphate

    asked by AKASH on April 26, 2016
  60. Chemistry

    using kinetics explain: a.the increasing of concentration of reactants increases the rate of reaction. b.the addition of a catalyst increases the rate at which a reaction will take place. c.and increase in temperature increases reaction rate. d.a catalyst

    asked by Chuck on March 4, 2008
  61. Chemistry

    When the oxide of generic metal M is heated at 25.0 °C, only a negligible amount of M is produced. O2M(s) ----> M(s) +O2(g) Delta G^o = 290.3 kJ/mol When this reaction is coupled to the conversion of graphite to carbon dioxide, it becomes spontaneous.

    asked by Janavi on March 23, 2014
  62. Chemistry

    A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....? A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP, with 0.163 M NaOH solution. She recorded an initial buret reading of 0.84 mL and

    asked by Cynthia on March 7, 2012
  63. Chemistry

    The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

    asked by Hannah on March 10, 2012
  64. Chemistry(Please help explain)

    The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

    asked by Hannah on March 10, 2012
  65. Chemistry(Can someone please answer!!)

    The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

    asked by Hannah on March 11, 2012
  66. Chemistry

    The decomposition of hydrogen peroxide in the presence of potassium iodide is believed to occur by the following mechanism: step 1 slow: H2O2 + I^- = H2O + OI^- step 2 fast: H2O2 + OI^- = H2O + O2 + I^- 1) What is the equation for the overall reaction? Use

    asked by Hannah on March 11, 2012
  67. physics

    Please help. Thanks! A car/truck with an initial displacement of 10.0 m and an initial velocity of 16.0 m/s accelerates at an average rate of 0.50 m/s2 for 4.0 s. What is the vehicle's displacement after 4.0 s?

    asked by kristi on December 1, 2011
  68. Science

    1. Massive amounts of destructive energy are released when a nuclear fission bomb explodes. Where does that energy come from? a) A chain reaction occurs when uranium atoms split, releasing nuclear energy. b) Molecules break down, releasing chemical energy.

    asked by Lez on May 15, 2016
  69. Chemistry

    3. An electrochemical reaction occurs between an unknown element and zinc. The half-cell reaction for the zinc is: Zn(s) → Zn2+(aq) + 2e− The cell potential for the reaction is Eºcell = 1.83 V. a. Is the reaction spontaneous or nonspontaneous?

    asked by Morgan on October 22, 2014
  70. Chemistry; Stoichiometry

    Consider the reaction 2Al + 3CuSO4 = Al2(SO4)3 + 3Cu What is the maximum amount of Cu (63.5 g/mol) that could be produced by reacting 20.0 grams of Al (27.0 g/mol) with excess CuSO4? 1. 70.6 g 2. 57.2 g 3. 129 g 4. 31.4 g Consider the reaction 4As + 3O2 =

    asked by Annalie on May 6, 2010
  71. phys.

    Hey, i feel kinda embarassed asking this because it looks so simple. a mass of 300kg which is positioned 1000m above the ground is allowed to fall to the ground. what will be its velocity on impact? Use the basic velocity formula. Initial velocity is zero;

    asked by jamie on October 7, 2006
  72. Chemistry

    Predict the products and write a net ionic reaction for the reaction of cadmium chloride and ammonium sulfide.

    asked by Mary on March 27, 2010
  73. help please?!

    If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then what is the rate constant for the reaction?

    asked by jameson on September 9, 2016
  74. Chemistry

    For the reaction HCONH2(g) -->

    asked by Kevin on May 30, 2018
  75. Chemistry

    A certain reaction has an activation energy of 58.80 kJ/mol. At what Kelvin temperature will the reaction proceed 6.50 times faster than it did at 303 K?

    asked by Sam on February 3, 2015
  76. Chemistry

    When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

    asked by sea lively on August 13, 2018
  77. Science

    Which of the following is true about photosynthesis? 1). it is an exothermic reaction. 2). it is an endothermic reaction. 3). it produces carbon dioxide . 4). it occurs in animal.

    asked by Leo the Lion on October 9, 2018
  78. Science

    If the concentration of AgCl drops from 1.000 M to 0.655 M in the first 30.0 s of the reaction, what is the average rate of reaction over this time interval?

    asked by Rose on February 6, 2015
  79. chemistry

    The reaction x products follows Ist order kinetics in 40 minutes the concetration of x changes from 0.1M to 0.025M then the rate of reaction when conc of x is 0.01

    asked by ameer on April 26, 2013
  80. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 28, 2011
  81. Chemistry

    in a particular redox reaction, Cr is oxidized to CrO42- and Ag+ is reduced to Ag. Complete and balance the equation for this reaction in acidic solution.

    asked by Anonymous on December 4, 2015
  82. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 28, 2011
  83. chemistry

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

    asked by john117 on February 27, 2012
  84. Chemistry

    A certain reaction has an activation energy of 25.65 kJ/mol. At what Kelvin temperature will the reaction proceed 5.50 times faster than it did at 291 K?

    asked by Ryan on March 2, 2013
  85. CHEMISTRY

    We have this reaction : HCO3- + OH- => CO3^-2 + H2O Specify the conjugate pairs and , which direction the reaction equilibrium shift ? and How ( as a rule ) ?

    asked by MAD on July 14, 2014
  86. Chemistry

    Consider the reaction: 2CO2(g)=2CO(g) + O2(g). A reaction mixture in a 5.0 L flask at a certain temperature. At equilibrium there are 85 g of CO2(g), 1.20 g of CO, and 0.688 g of O2(g). Calculate Kc.

    asked by Ariel on February 28, 2011
  87. chemistry

    A certain reaction has an activation energy of 25.14 kJ/mol. At what Kelvin temperature will the reaction proceed 8.00 times faster than it did at 305 K?

    asked by Tsomo on July 13, 2014
  88. Chemistry

    When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

    asked by sea lively on August 14, 2018
  89. chem.

    A certain reaction has an activation energy of 66.58 kJ/mol. At what Kelvin temperature will the reaction proceed 4.50 times faster than it did at 289 K

    asked by Anonymous on March 15, 2014
  90. Chemistry

    the reaction of 6.62g of carbon with excess oxygen yields 13.40g of CO2. what is the percent yield of this reaction

    asked by Kelly on May 18, 2013
  91. chemistry

    Explain the reaction mechanism of the following reaction by showing the types of bond splitting and atom rearrangements. C + O2 = CO2

    asked by Elijah Bowie on November 21, 2011
  92. Chemistry

    When K is measured for a reaction, the values obtained are 3.1 at 25°C and 7.42 at 35°C. Using the equation lnK=-(∆H°/R)(1/T)+(∆S°/R) (in the form y=mx+b) calculate ∆H° and ∆S° for the reaction PbCl2(s) --> Pb2+(aq) + Cl-(aq)

    asked by sea lively on August 14, 2018
  93. gr10 science

    The products of the reaction are iron (III) hydroxide and sodium chloride. How could I write a word equation for this reaction?

    asked by Rebecca on April 26, 2011
  94. chemistry

    True or False? An equilibrium constant K_c=1x10^7 for a reaction indicates that the reaction favors product formation.

    asked by Sheila on May 3, 2010
  95. High School Chemistry

    Explain the reaction mechanism of the following reaction by showing the types of bond splitting and atom rearrangements. C + O2 = CO2

    asked by Elijah Bowie on November 21, 2011
  96. Chemistry

    A reaction yields 3.75 L of nitrogen monoxide. The Volume is measured at 19 *C and a pressure of 1.10 atm. What mass of NO was produced by the reaction?

    asked by CHEMMY on April 9, 2012
  97. Chemistry

    for a particular reaction H=-28.4 KJ and S=-87.9 J/K. Assuming these values change very little with temperture, over what temperature range is the reaction spontaneous in the forward direction?

    asked by Joshue on July 29, 2011
  98. Science!

    1) Which of the following is true about photosynthesis? A. it is an exothermic reaction B. it is an endothermic reaction C. It produces carbon dioxide D. it occurs in animals I think it's A.

    asked by Anonymous on February 24, 2016
  99. chemistry

    Explain why the rate of a simple chemical reaction such as NO(g)+1/2O2(g)=NO2(g) is likey to be most rapid at the beginning of the reaction.

    asked by Kim on May 3, 2010
  100. why will no one answer? chem

    If the reaction Cl2 (g) + O3 (g) = Cl2O (g) + O2 (g) occurred in just two steps, what would be the overall order of the reaction be? a. 1 b. 2 c. 3 d. 4 e. not possible to determine from the information given i have absolutly no idea how to do this

    asked by john117 on February 27, 2012