1. Science

    For the reaction: 2NO(g) + H2(g) N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00

    asked by Kat on April 13, 2016
  2. Chemisty

    For the reaction: 2NO(g) + H2(g) N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00

    asked by Kat on April 13, 2016
  3. Chemisty

    For the reaction: 2NO(g) + H2(g) N2O(g) + H2O(g) + energy Write the equilibrium constant expression for the reaction. This reaction takes place at 25°C. At this temperature the concentration of NO is found to be 1.75 mol/L, the concentration of H2 is 3.00

    asked by Kat on April 13, 2016
  4. chemistry Dr BOB

    is this right? C2H6O + 3O2 = 2CO2 + 3H2O In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2. Write a combustion reaction for

    asked by Mark on October 27, 2015
  5. Chemistry

    NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction? I came up with the solution of 0.896 kJ/mol. Is this correct?

    asked by Summer on April 9, 2018
  6. Chemistry

    2Mg + O2--->2MgO If more magnesium is added a.the reaction will shift to the right. b.the reaction will shift to the left. c.there will be no shift. and why im confused on why it would happen.

    asked by Anonymous on July 3, 2011
  7. chemistry

    The electrochemical cell described by the balanced chemical reaction has a standard emf (electromotive force) of 0.27 V. Calculate the equilibrium constant (Kc) for the reaction at 298 K. Round your answer to 3 significant figures. H2O2(aq) + 2ClO2(g) →

    asked by its me on June 6, 2010
  8. chemistry

    1. what would happen to the the cell potential in a voltaic cell if the salt bridge lost contact with one of the solutions? 2. would a reaction occur if solid tin was placed in a solution of copper II nitrate? If so, write the balanced net ionic equation

    asked by Anonymous on May 19, 2015
  9. Chemistry

    If Cobalt(II)Sulfate is heated too strongly, the following reaction will occur CoSO4 produces CoO(s)+ SO3(g) If you are heating a sample of CoSO4.6H20 and this reaction occurs along with dehydration, what will happen to the experimental percent water?

    asked by Sarah on October 2, 2010
  10. Chemistry

    Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) (thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b) Mg(OH)2(s) = MgO(s) + H2O(I) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(I) + 2H2O(I) =

    asked by Brett on July 3, 2014
  11. physical chemistry

    For the process CH4(g) = C(s) + 2H2(g) A reaction is started in a rigid vessel at 1000 K with 1 mole of methane and 1 mole of hydrogen gas at 10 bar. Use table C.3 from your text to determine how many grams of carbon should be formed after the reaction has

    asked by patrick on November 12, 2010
  12. Chemistry

    Using standard enthalpies information, calculate the standard enthalpy change for this reaction. a)(thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b)Mg(OH)2(s) = MgO(s) + H2O(I) c)N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d)SiCl4(I) + 2H2O(I) = SiO2(s)

    asked by Dan on July 4, 2014
  13. Chemistry

    I've been studying the transesterification of dimethyl carbonate to diphenyl carbonate, and experimental equilibrium constant (K) values range from 0 to 0.5 at temperatures from 298 to 450 Kelvin. My question is: How do we make a reaction more spontaneous

    asked by Namie on August 29, 2012
  14. chemistry

    Enzymes in the liver catalyze a large number of reactions that degrade ingested toxic chemicals . By what factor is the rate of detoxification reaction changed if a liver enzyme lowers the activation energy of the reaction by 5 kj / mol at 37 celcius ?

    asked by firdaus on December 19, 2012
  15. chemistry 102

    The following decomposition reaction SO2Cl2-->SO2 + Cl2 was run in a laboratory. Following data collected: Time(s) Pressure SO2Cl2 (ATM) 0 1 2500 .947 5000 .895 7500 . 848 10000 .803 What is the overall order of reaction?

    asked by vika on September 18, 2011
  16. Chem

    This is the problem: In a 1-L beaker, 203 ml of 0.307 M ammonium chromate was mixed with 137 ml of 0.269 M chromium (III) nitrite to produce ammonium nitrite and chromium (III) chromate. Write the balanced chemical reaction occuring here. If the percent

    asked by Anonymous on October 31, 2006
  17. Chemistry-DrBob222

    I got 62.9 mL. Is this correct? I think HCl is the LR. A piece of solid magnesium is reacted with hydrochloric acid to form hydrogen gas: Mg (s) + 2HCl (aq) ---> MgCl2 (aq) + H2 (g) What volume of hydrogen gas (in mL) is collected over water at 25 degrees

    asked by Nevaeh on March 12, 2016
  18. Chemistry

    Okay, this is a question in several parts that really stumps me: Given the following reaction determine the rate of expression (CH3)3CBr + OH -----> (CH3)3COH + r [(CH3)3CBr] OH Initial reaction rate (mol L-1 sec-1) .10 .10 1.0 x 10 ^ -3 .20 .10 2.0 x 10 ^

    asked by Wendi on April 17, 2011
  19. English

    Write the verbs in the following sentences. Then identify each verb as bse form (b), present participle with auxiliary verb (pp), simple past form (past), or past participle with auxiliary very (past p), Some of the sentences have two verbs. First

    asked by Cindy on December 4, 2008
  20. chemistry

    Calculate enthalpy change of reaction for the combustion of gaseous ethanol. C2H5OH + 3O2 >> CO2 + 3H2O. Using standard molar enthalpies of formation. C2H5OH -235.3 ( it's negative sign) CO2 -393.5 H2O -241.8 (1) Calculate the enthalpy change of reaction

    asked by Alex on April 20, 2010
  21. chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is

    asked by Brenda on January 13, 2011
  22. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is

    asked by Brenda on January 12, 2011
  23. Chemistry

    C2H2(g) + 2 H2(g)--> C2H6(g) Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g 200.9 226.7 H2(g) 130.7 0 C2H6(g) -- -84.7 Bond Bond Energy (kJ/mol) C-C 347 C=C 611 C-H 414 H-H 436 If the value of the standard entropy change, ∆Sº for the reaction is

    asked by Brenda on January 12, 2011
  24. chemistry

    A 0.0583 mol sample of formaldehyde vapour, CH2O, was placed in a heated 0.359 L vessel and some of it decomposed. The reaction is CH2O(g)---> H2(g) + CO(g). At equilibrium, the CH2O concentration was 0.0449 M. What is the value of Kc for this reaction? my

    asked by alex on April 20, 2013
  25. Chem

    if the pressure was increased in this reaction : 2NO(g)+ O2 =====> 2NO2

    asked by Hello Kit on March 27, 2007
  26. Chemistry

    Iron pyrite (FeS2) is the form in which much of the sulfur exists in coal. In the combustion of coal, oxygen reacts with iron pyrite to produce iron(III) oxide and sulfur dioxide, which is a major source of air pollution and a substantial contributor to

    asked by Danana on February 16, 2017
  27. AP Chemistry

    Hey guys! I'm stuck on some study guide problems... (On the bottom of this, I put what answers make sense to me) A) A factor that affects the speed of heterogeneous reactions but not of homogeneous reactions is 1)nature of reactants 2)concentration of

    asked by Allie on September 23, 2015
  28. algebra

    Could you please help me?? point-slope form linear equation y-3 = 3(x+1) what is the equation in standard form of a perpendicular line that passes through (5,1). i think you take 1/3 as slope, reciprocal, I am confused about how to proceed. I know you put

    asked by ann on January 13, 2012
  29. 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

    asked by Kristien on March 8, 2013
  30. Nuclear Chemistry

    The half- life of a positron is very short. it reacts with an electron, and the masses of both are converted to two gamma-ray photons: (0e+1)+ (0e-1)---> 2γ (the 0 in front of e is the mass # and behind it is the atomic #) (γ stands for the photons) This

    asked by Anonymous on June 13, 2012
  31. Maths

    How many silver coins ,2cm in diameter and of thickness 2mm,must be melted to form a showpiece in the form of frustum of a cone having height 9cm and radii of outer circular ends as5cm 3cm

    asked by Tanu on July 6, 2017
  32. chemistry

    True or False: 1. A rate law can be written from the molecularity of the slowest elementary step. 2.The final rate law can include intermediates. 3.The rate of a reaction is dependent of the fastest step in the mechanism. 4.A mechanism can never be proven

    asked by Tommy on February 11, 2007
  33. Chemistry

    Which of the following is the best definition of Hess' Law? A. Heat evolved in a given process can be expressed as the sum of the heats of several processes that, when added, yield the process of interest. B. The enthalpy of a process is the difference

    asked by Jared on May 7, 2007
  34. Hess' law

    Which of the following is the best definition of Hess' Law? A. Heat is always released by the decomposition of 1 mole of a compound into its constitute elements. B. Since enthalpy is a state function, it will be different if a reaction takes place in one

    asked by christine on February 9, 2007
  35. Biology (alert!)

    Which sentence do you think does not agree with the true facts of coral reefs? 1. Off shore coral reefs are the cause of terrible storms in coastal communities. 2. Coral reefs form when the shells of thousands of corals join. 3. Sponges gives out chemicals

    asked by eliana on January 18, 2011
  36. chemistty

    Pure (R)-2-bromo-1-fluorobutane reacts with sodium cyanide in aqueous ethanol to form pure (R)-2-(fluoromethyl)butanenitrile. CH3CH2CHCNCH2F2-(fluoromethyl)butanenitrile a. What is the probable mechanism of this reaction? Explain your reasoning. I think

    asked by levy on October 16, 2007
  37. Chemitry

    Nitrogen dioxide, NO2, decomposes upon heating to form nitric oxide and oxygen according to the following equation: 2NO2(g)---->2NO(g) + O2(g) At the beginning of an experiment, the concentration of nitrogen dioxide in a reaction vessel was 0.1103 mol/L.

    asked by Irina on December 2, 2010
  38. Chemistry

    Nitrogen and hydrogen react to form ammonia. Consider the mixture of N2 and H2 in a closed container. In this container there are 6 diatomic molecules of hydrogen and 6 diatomic molecules of nitrogen. assuming the reaction goes to completion draw a

    asked by student on March 4, 2010
  39. English check

    1. Which description fits the limerick about the fellow named Hall? 1)a poem about something funny with five lines. ****** 2)a serious poem without rhyme 3)a love poem with rhymes and rhythm 4)a poem about nature with three lines 2. The rhythm and rhyme

    asked by Hailey on February 19, 2015
  40. chemistry

    Equillibrium, an example given by my textbook confused me. First it shows a reaction inside a soft drink: co2(g)-->

    asked by kevin on August 6, 2009
  41. Chemistry

    Over the years, the thermjte reaction has been used for welding railroads, in incendiary bombs, and to ignite solid fuel rocket monitors. The reaction is Fe2O3(s) + Al(s) ---> 2Fe(l) + AI2O3(s). What mass of iron (iii) oxide(rust) must be used to produce

    asked by Lauren on September 19, 2017
  42. Science

    I am working on a year 10 physics assignment on road science. I am trying to figure out the reaction distance of a car with: Skid marks = 24m Reaction time = 1 sec Decelaration rate = 6m/sec I have many formulas in my book and am unsure of which one to use

    asked by Melody on May 16, 2008
  43. Chemistry

    In a constant-pressure calorimeter, 65.0 mL of 0.330 M Ba(OH)2 was added to 65.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.85 °C to 28.35 °C. If the solution has the same density and specific heat as water,

    asked by Nate on October 22, 2013
  44. Chemistry

    Over the years, the thermjte reaction has been used for welding railroads, in incendiary bombs, and to ignite solid fuel rocket monitors. The reaction is Fe2O3(s) + Al(s) ---> 2Fe(l) + AI2O3(s). What mass of iron (iii) oxide(rust) must be used to produce

    asked by Lauren on September 19, 2017
  45. Chemistry

    Alumminum hydroxide reacts with sulfuric acid as follows: 2Al(OH)3+H2SO4-->Al2(SO4)+6H2O. Which reagent is the limiting reactant when 0.500 mol Al(OH)3 and 0.500 mol H2SO4 are allowed to react? How many moles of Al2(SO4)3 can form under these conditions?

    asked by Chris Sung on October 29, 2010
  46. BioChem

    I have a hard time with this question. Please help. One way to determine the concentration of protein in a solution is to perform a "protein assay". There are several assay kits on the market that one can use, but they all rely on the common paradigm that

    asked by Jamshid on June 17, 2006
  47. chemistry

    Do any of you think that spontaneous combustion is possible? If a reaction brings about an increase of entropy (increase in randomness) and also exodermic, then a reaction is spontaneous. Right? Yes, I think spontaneous combustion is possible. It happens.

    asked by key on April 16, 2007
  48. chemistry

    Precipitation Reactions Write a molecular equation for the precipitation reaction that occurs (if any) when the following solutions are mixed. If no reaction occurs, write NO REACTION. Express your answer as a chemical equation. Identify all of the phases

    asked by Jake on February 9, 2009
  49. Physics

    The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an ƒ¿-particle (4He) from two 3He nuclei: 3He + 3He ¨ 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon.

    asked by charlie on June 18, 2009
  50. Chemistry

    Classify each of the following as a redox reaction or a non-redox reaction. Zn+CuCl2 -> ZnCl2+Cu HCl+NaOH -> H2O+NaCl 2CO+O2 -> 2CO2 SO3+H2O -> H2SO4

    asked by Anon on December 2, 2012
  51. Chemistry

    Calculate the enthalpy change for the reaction: 2S(s) + 3O2(g) --> 2SO3(g) Use the following thermochemical equations: Reaction S(s) + O2(g) --> SO2(g) Delta H(in kJ) -296.8 2SO2(g) + O2(g) --> 2SO3(g) Delta H(in kJ) -197.0

    asked by Jordin on October 14, 2010
  52. Chem 3A

    please help me with this chemistry problem. 1) Write out a balanced chemical reaction equation for the reaction of magnesium with hydrochloric acid, and then What is the Theoretical Yield after balancing the chemical equation?

    asked by shylo on July 25, 2008
  53. chem

    At a certain temperature, the reaction CO(g) + 2H2(g) CH3OH(g) has Kc = 0.500. If a reaction mixture at equilibrium contains 0.00436 M CH3OH and 0.220 M H2, what is the equilibrium concentration of CO? The answer is 0.280 M. I don't know how to get it.

    asked by chris on April 28, 2011
  54. Chemistry

    1.29g H2 is allowed to react with 10.3g N2 , producing 1.86g NH3. What is the theoretical yield for this reaction under the given conditions? What is the percent yield for this reaction under the given conditions? I have been stucks for days now.

    asked by ASh on February 7, 2012
  55. Another caffeine from tea question

    Can anyone show me the reaction of sodium carbonate with water to produce bicarbonate and hydroxide as sodium carbonate dissolves? And if any, what is the reaction of tannins and caffeine with this solution? Thanks loads!

    asked by Scott on November 29, 2008
  56. Chemistry

    For the following reaction 2NO2 -> 2NO +O2 is second order reaction. If the initial concentration of NO2 is 0.098M and the initial rate of disappearance is 2.72e-3 M/sec , what is the value of the rate constant?

    asked by Cole on February 10, 2015
  57. General Chemistry

    A reaction is run at 20 degrees celsius and takes 30 minutes to go to completion. How long would it take to complete the same reaction at a temperature of 40 degrees celsius? *I believe finding the time has something to do with log? I'm not sure

    asked by Sidiqi on December 8, 2017
  58. Science

    A neutralization reaction between an acid and a base produced the salt Na2CO3. What acid and what base participated in this reaction? ---------------- Sorry about just asking without showing work or anything, but I don't really get the concept of this and

    asked by Anonymous on March 3, 2015
  59. chemistry

    A reaction produced 0.40 mmol of H in a buffered solution which contained 300ml of 0.06M succinate buffer, pH is 4. What was the pH of the medium after the reaction was completed? The pKa of succinate buffer is 4.21

    asked by veronica on April 19, 2013
  60. CHEMISTRY

    Consider the reaction shown below. 4 PH3(g) P4(g) + 6 H2(g) If, in a certain experiment, over a specific time period, 0.0061 mol PH3 is consumed in a 1.9-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?

    asked by Mattie on February 27, 2011
  61. Chemistry 104

    A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

    asked by Walter on March 9, 2013
  62. chemistry

    for the reaction: 4NH3+5O2=4NO+6H2O; 15.0g of NH3 and 27.5g of O2 were reacted. a). which is the limiting reactant? b).how many moles of NO are formed from the limiting reactant in the above reaction. what would be the first step in this problem?

    asked by tina on March 6, 2008
  63. chemistry

    In a particular redox reaction, Cr is oxidized to CrO42– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional. Cr + Cu2+ = CrO42- + Cu+

    asked by Anonymous on February 24, 2012
  64. Chemistry 104

    A reaction rate doubles when the temperature increases from 0 degrees Celsius to 10 degrees Celsius, maintaining everything else equal. What is the activation energy for this reaction? (R = 8.314 J/mol K)

    asked by Walter on March 9, 2013
  65. Chemistry chemical equilibrium

    1.25 mol of NOCl was placed in a 2.50 L reaction chamber at 427 celciciu degre . After equilibrium was reached, 1.1 mole of NOCl remained. Calculate the equilibrium constant Kc for the reaction

    asked by Abdela on February 18, 2012
  66. Chemistry

    At 3745°C, K = 0.093 for the following reaction. N2(g) + O2(g) equilibrium reaction arrow 2 NO(g) Calculate the concentrations of all species at equilibrium for each of the following cases. (a) 2.0 g N2 and 3.0 g O2 are mixed in a 1.3-L flask. [N2] [O2]

    asked by Gloria on February 27, 2017
  67. chemistry

    Ammonium sulfate can be made by the reaction H2SO4 + 2 NH3 ® (NH4)2SO4. What quantity of ammonium sulfate will result from the reaction of 5.00 kg of ammonia and 20.0 kg of sulfuric acid?

    asked by Anonymous on March 26, 2011
  68. Chemistry

    Given…Overall reaction: 2 NO2 (g) + F2 (g) → 2 NO2F (g) Rate = k[NO2][F2] a. Can this be a single step reaction? b. Postulate a mechanism using experimental data and chemical intuition come up with a mechanism that fits.

    asked by m on March 6, 2013
  69. general chemistry

    In a study of the effect of alcohol dehydrogenase on alcohol at 25.0 °C, the concentration of ethanol in a first-order reaction decreased from 220.0 mmol/L to 56.0 mmol/L in 1.22 x 104s. What is the rate constant for the reaction at 25.0 °C?

    asked by susie on October 22, 2009
  70. Chemistry

    In order for the reaction 2Al(s) + 6HCl(aq)→2AlCl3(aq) + 3H2(g) to occur, which of the following must be true? A. Al must be above Cl on the activity series. B. Al must be above H on the activity series. C. Heat must be supplied for the reaction. D.

    asked by quick help please on June 8, 2016
  71. 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 -I converted grams to Al to moles -and since there are 2 moles of Al, what do i do with the -1408.4 KJ? please provide steps.

    asked by Julie on February 17, 2010
  72. chemistry

    The reaction CH3- N≡C → CH3- C≡N is a first-order reaction. At 230.3°C, k = 6.29 x 10^-4 s^- 1. If [CH3 -N≡ is 1.00 x 10^-3 initially, C] [CH3-N ≡ C] is __________ after 1.000 x 10^3 s. A) 5.33 x 10^-4 B) 1.00 x 10^-6 C) 4.27 x 10^-3 D) 2.34 x

    asked by jes on October 25, 2010
  73. Chemistry

    A first order reaction has an activation enery of 50.0kJ/mol. When a catalyst is added the activation energy of the catalyzed reaction is Ea/2. Calculate the ration of k(uncatalyzed)/k(catalyzed) at 25 degree C.

    asked by Darcy on April 8, 2010
  74. Chemistry Honors

    At a particular temperature, 12.0 mol of NH3 is introduced into a 2.0 container, and the NH3 partially dissociates by the reaction: 2NH3 N2 + 3H2 At equilibrium, 6.0 mol of H2 gas are present. Calculate the K for this reaction.

    asked by Marie Genvieve on July 20, 2013
  75. Chemistry

    In a particular redox reaction, MnO2 is oxidized to MnO4– and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in acidic solution. Phases are optional. MnO2 + Cu^2+ ---> MnO4^- + Cu^+

    asked by BOB on May 5, 2014
  76. College Chemistry

    Animals break down glucose (C6H12O6) as a source of energy according to the following overall reaction. C6H12O6(aq) + 6O2(g) ¨ 6CO2(g) + 6H2O(l) What mass in grams of CO2(g) is produced from the reaction of 15.0 g of glucose?

    asked by Lisa on March 27, 2012
  77. Science

    Thermite is a mixture of iron(III) oxide and aluminum powders that is used in some countries to weld railroad tracks. It is a spectacular reaction to yield solid aluminum oxide that floats on the molten iron. When cooled, the iron is ground smooth and even

    asked by Megan on November 17, 2011
  78. Physics

    The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon.

    asked by Angie on June 20, 2009
  79. physics

    The last stage in the fusion of hydrogen to form helium in the Sun involves the formation of an alpha particle (4He) from two 3He nuclei: 3He + 3He 4He + p + p The binding energy for 3He is 2.57 MeV per nucleon and that for 4He is 7.07 MeV per nucleon.

    asked by charlie on June 19, 2009
  80. chemistry

    already missed question so I just need help figuring out what I did. Small amounts of chlorine gas can be gener- ated in the laboratory from the reaction of manganese(IV) oxide with hydrochloric acid: 4 HCl(aq) + MnO 2 (s) → 2 H 2 O( ℓ ) + MnCl 2 (s) +

    asked by Pat on February 24, 2017
  81. Trigonometry

    Given the rectangular-form point (–1, 4), which of the following is an approximate primary representation in polar form? A. −(4.12, 1.82) B. (−4.12, −1.33) C. (4.12, 1.82) D. (4.12, 4.96) Change 8 cis 240degrees to rectangular form. A. -4(Square

    asked by Anonymous on August 7, 2012
  82. Science

    Can an element be separated to form a compound? Can an element form a compund? I think it's a yes to both of the above questions. An element can form a compound by combing with another element.

    asked by Immy on September 13, 2010
  83. Chemistry

    Hydrogen and methanol (CH3OH) have both been proposed as alternatives to hydrocarbon fuels. a) Write balanced chemical equations for the complete combustion of hydrogen and the complete combustion of gaseous methanol. Combustion reaction for hydrogen:

    asked by Jarrod on November 4, 2010
  84. science

    humidity is the amount of water vapor in the air ata given time.if the air at 75degrees holding the maximum amount of moisture it can,and the temperture suddenly drops to 60 degrees,what is likely to happen? a)percipitation will be released in the form of

    asked by jessica on October 9, 2007
  85. Chemistry

    How do write a skeleton equation for this reaction? When heated, baking soda (sodium hydrogen carbonate) decomposes to form the products sodium carbonate, carbon dioxide, and water. Can someone please break it down so i can see how you got that ansewer?

    asked by Bryan on March 15, 2007
  86. chemistry

    A voltaic cell is constructed based on the following reaction and initial concentrations: Fe^2+,( 0.0055 M ) + Ag+,( 2.5 M ) ----> Fe^3+,( 0.0055 M ) + Ag(s)

    asked by lynn on March 29, 2009
  87. chemistry kinetics

    The reaction SO2Cl2(g) → SO2(g) + Cl2(g) is a first order reaction carried out at constant volume at 600 K whose t1/2 is 4.1 hr. The initial pressure of SO2Cl2 is 1.25 atm. What will be the total pressure of the system after 1 hour?

    asked by swa on May 24, 2012
  88. Chemistry

    Consider the following chemical reaction: C (s)+ H2O(g) --> CO(g)+ H2(g) How many liters of hydrogen gas are formed from the complete reaction of 1.20 mol of C? Assume that the hydrogen gas is collected at a pressure of 1.0 atm and temperature of 310 K.

    asked by Eileen on April 16, 2010
  89. Chemistry

    Consider the generic reaction: 2 A(g)+ B(g)--> 2C(g). If a flask initially contains 1.0 atm of A and 1.0 atm of B, what will be the pressure in the flask if the reaction proceeds to completion? (Assume constant volume and temperature.) answer is 1.5atm how

    asked by Mark on October 18, 2015
  90. chemistry

    Ethylene gas (C2H2) can be formed from the reaction of calcium carbide (CaC2) with water. What is the reaction rate if 14.2 grams of ethylene gas are produced over 4.00 seconds? The units are mol/s.

    asked by danny on February 15, 2015
  91. college chem

    In the reaction PCl5(g) ---> PCl3(g) + Cl2 (g) 0.200 mol of PCl5 is introduced into a 2.00 liter vessel. At equilibrium, the concentration of Cl2 is found to be 0.0500 molar. Find Kc for the reaction.

    asked by josh on March 8, 2010
  92. Reaction rates

    The reaction, C2H5Br --> C2H4 + HBr, has a rate constant k = 0.0000100 s-1 at 363 °C and k = 0.000479 s-1 at 427 °C. What is the rate constant for the reaction at 725 K? Round your answer to 3 significant figures.

    asked by Confused on November 21, 2010
  93. chemistry

    n an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?

    asked by brittany on October 21, 2013
  94. chemistry

    Write the equations describing the electrode reactions and the net cell reaction for this electrochemical cell containing indium and cadmium: This is what I have so far: anode: In(s) --> In^3+ + 3e- cathode: Cd^2+ + 2e- --> Cd (s) Need help writing the

    asked by Lexi on April 15, 2013
  95. Chemistry

    Suppose NaOH is added to the following system when it is at equilibrium. NH3 (aq) + H2O (l) = NH4 (aq) + OH (aq) a) in which direction will the reaction shift after the NaOH is added? b) will this stress increase or decrease the value of the reaction

    asked by Anonymous on January 28, 2015
  96. chemistry

    In an experiment, Ann mixes concentrated sulfuric acid with water in a reaction test tube. The walls of the test tube turn hot. What type of reaction has occurred?

    asked by josie on June 18, 2014
  97. Chemistry

    Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: A 2.00-g sample of is reacted with 1.93 g of . How many grams of water remain after the reaction is complete? 0.0714 1.29 0.00 1.04 0.00396

    asked by Martese on February 14, 2012
  98. chemistry

    In the reaction A to products, A is found to be 0.489 M at t=72.0 s and 0.468 M at t=82.2 s What is the average rate of the reaction during this time interval? Do I take the Ln (0.468/0.489) = -0.04395 / 10.2 = 4.3 * 10^3. yet the comp says its wrong. i

    asked by david on February 24, 2010
  99. Microbiology- Biology 205

    Can someone please help me with this question.... When you blow bubbles into a glass of water, the following reactions take place: H2O + CO2 --a--> H2CO3 --b--> H+ + HCO3- 1. What type of reaction is a? 2. What does reaction b tell you about the type of

    asked by Jessie T. on April 14, 2010
  100. chem

    7.82 SILVER(I) NITRATE REACT WITH POTASSIUM CHLORIDE FIND THE BALANCED CHEMICAL REACTION USING THE GIVEN MASS FIND THE MASS OF THE REAGENT. ALSO CALCULATE THE MASSES OF THE PRODOUCT FORMED IN THE REACTION

    asked by sam on September 20, 2011