1. science

    iron and sulphur reaction

    asked by suzy on May 23, 2012
  2. chemistry

    when will a displacement reaction not occur?

    asked by mike on February 26, 2008
  3. maths

    what is the equllibrium constant of KI + I2 reaction at 35 c?

    asked by tharindu on October 17, 2012
  4. chemistry

    reaction between Na2a2o3+licro4

    asked by normah on December 26, 2010
  5. chem

    Balance the Following Reaction: Mg(s) + H2O(g)Mg(OH)2(s) + H2(g)

    asked by will.i.am on January 7, 2013
  6. science

    what is the reaction between hexane & iodine?

    asked by xyz on May 11, 2010
  7. physical science

    Which of these is the balanced equation for this reaction? A. B. C. D.

    asked by kierra on June 12, 2012
  8. history: please help for a survey

    what is your reaction on the first and second opium war?

    asked by Mely on September 16, 2011
  9. chemistry

    Provide an example of a spontaneous reaction

    asked by WhatsUp on March 30, 2018
  10. Chemistry

    Is esterification a condensation reaction?

    asked by Anonymous on January 18, 2014
  11. Chemistry

    Is esterification a condensation reaction?

    asked by Anonymous on January 18, 2014
  12. biology

    What will happen to the reaction without an enzyme?

    asked by Anonymous on September 26, 2009
  13. Chemistry

    Is photosynthesis a reversible reaction?

    asked by Stoof on September 1, 2015
  14. thermodynamics

    H° = 565 kJ and S° = -11.1 J/K Calculate G° at 25°C for this reaction.

    asked by Anonymous on August 25, 2013
  15. bmcc

    which of the following is an oxidation reduction reaction ?

    asked by Anonymous on October 18, 2016
  16. Chemistry 12

    Is O2(g) O2(aq) an endothermic/exothermic reaction, and why?

    asked by JM on May 5, 2011
  17. chemistry

    Why reversible reaction never complete

    asked by ali on June 21, 2016
  18. chemistry

    If you have 13.0g of Na, how many grams of O2 are required for the reaction?

    asked by deven on September 18, 2013
  19. Chemistry

    38. Identify the type of reaction. A + B --> AB A + BC --> AC + B Thanks -MC

    asked by mysterychicken on October 26, 2010
  20. Chemistry

    How do you find a reaction order?

    asked by Student on January 22, 2018
  21. physics

    What does it mean when they say that action equals reaction?

    asked by elise on February 10, 2012
  22. Chemistry

    Which reaction below represents the second ionization of Lr?

    asked by Savannah on November 15, 2016
  23. Chemistry

    Zn + I2 ---> Zn ^+2 + 2I- will this reaction occur spontaneously?

    asked by Shelly on November 7, 2011
  24. Science--Chemistry

    How do you solve the reaction: Li + Mg2+ = ?

    asked by Holly on October 3, 2008
  25. Chemistry

    What is the reaction of dilute HCl with Zn?

    asked by Anamika on February 23, 2016
  26. Chemistry

    If Kc = 0.480 at 40.°C and Kc = 0.630 at 90.°C, what is ΔH° for the reaction? XY

    asked by Andrew on March 10, 2012
  27. chemistry

    what is the name of reaction for 3C2H2--> C6H6?

    asked by hi on September 22, 2013
  28. life science

    What does Glycolysis reaction need to proceed?

    asked by shelise on November 23, 2008
  29. GCC


    asked by Maria on October 29, 2013
  30. science

    describe the reaction of photosynthesis.

    asked by chanell on October 10, 2007
  31. chemistry

    Why is respiration an exothermic reaction?

    asked by josie on June 18, 2014
  32. chemistry

    A salt is obteind as a reaction between

    asked by Anonymous on November 11, 2011
  33. chemistry

    what type of reaction is Al+S8=Al2S3

    asked by angel on March 14, 2012
  34. chemistry

    write the reaction for Zn + HCl

    asked by Juanita on March 31, 2011
  35. Chem

    NaOH (aq) + Zn (solid) reaction

    asked by John on November 12, 2007
  36. English

    1.Susan made small and cute teddy bears. (In this sentence, what is the meaning of 'teddy'?) 2. I like both Tom and Don. 2-1. I like Tom and Don. 2-2. I want to marry Tom or Don. 2-3. I like neither Tom nor Don. 2-4. I don't like Tom, and I don't like Don,

    asked by John on November 4, 2008
  37. MATH

    15. Write the ratio as a fraction in simplest form. 8 out of 10 (1 point) ANSWER 4/5? 16. In the population of a particular country, the male-to-female ratio is 34 to 48. Write this ratio as a fraction in simplest form. (1 point) ANSWER 17/24? Am i right?

    asked by XenaGonzalez on March 11, 2015
  38. MAth 109

    The formula d= square root of 3h/2 models the distance, d, in miles, that a person h feet high can see to the horizon. If the pool deck on a cruise ship is 80' above the water, how far can passengers on the pool deck see? Write the answer in simplified

    asked by Zsa Zsa on July 26, 2015
  39. Honors Chemistry

    "How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 ---> 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x

    asked by Emily on November 9, 2009
  40. physics

    How do i go about this question? Suppose a car is traveling at 20.0m/s, and the driver sees a traffic light turn red, After 0.530s has elapsed (the reaction time), the driver applies the brakes, and the car accelerates at 7.00m/s2. What is the stopping

    asked by manny on August 16, 2007
  41. Algebra

    1.Write an equation in slope- intercept form of the line that passes through the given point and is parallel to the graph of the given equation. (2,-2);y=-x-2 A.y=-2x*** B.y=2x C.y=1/2x D.y=-x 2.Write an equation in slope- intercept form of the line that

    asked by GummyBears on November 14, 2015
  42. Chemistry

    One of the concerns about the use of Freons is that they will migrate to the upper atmosphere, where chlorine atoms can be generated by the following reaction: CCl2F2 --> CF2Cl + Cl Chlorine atoms can act as a catalyst for the destruction of ozone. The

    asked by Jim on October 27, 2010
  43. Chem

    If the initial pressure of HD(g) is 8.913 atm, calculate the % decomposition of HD(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 1000 K is 0.26. The initial pressure of the reaction products is 0 atm.

    asked by May on October 2, 2016
  44. Chemistry

    Calculate the ΔHrxn for the following reactions using the heats of formation given in the table at the end of this assignment: a)The complete combustion of methane, CH4, producing water as a liquid. b)The complete combustion of glucose, C6H12O6, producing

    asked by Beth on February 4, 2015
  45. math plz help my last chance to do this homework

    a) write an expression in simplest form for the perimeter of each triangle. b)write another expression in simplest form that shows the difference between the perimeter of the larger triangle and the perimeter of the smaller triangle.

    asked by sarah on May 25, 2016
  46. Physics

    When presented 1/4 N as data in a problem is this considered to be one significan figure becasue it is presented in the form of a fraction were there's only one significant figure. I'm asking this becasue if you converted it to a decimal you would have .25

    asked by Jake on December 20, 2009
  47. spanish

    1). What is a "cognate"? 2). Why is learning cognates the most efficient and rapid way to learn to read, speak, increase vocabularly and get high marks on tests in a foreign language? Bonus question: What is the relationship between "cognates" and

    asked by Francis on June 24, 2012
  48. Chemistry

    If delta H°rxn and delta S°rxn are both positive values, what drives the spontaneous reaction and in what direction at standard conditions? The spontaneous reaction is a)enthalpy driven to the left. b)entropy driven to the right. c)entropy driven to the

    asked by Alexis on April 21, 2014
  49. Chemistry

    In a study of the following reaction at 1200K it was observed that when the equilibrium partial pressure of water vapor is 15.0 torr, the total pressure at equilibrium is 36.3 torr. 3Fe(s)+4H2O(g) (reversible arrows) Fe3O4(s)+4H2(g) Calculate the value of

    asked by Taasha on July 30, 2007
  50. Chemistry

    C. Consider the reaction 2C3H6 + 9O2 6CO2 + 6H2O. If the rate at which C3H6 is reacting is 0.40 mol liter−1s−1, then the rate at which 1. O2 is reacting is 1.6 mol liter−1s−1 2. CO2 is being formed is 0.40 mol liter−1s−1 3. H2O is being formed

    asked by Jim on September 19, 2015
  51. chemistry redox reactions

    can someone check my labels for the reaction of a radical with an extra electron, (R(e-)) and an antioxidant, ArOH. R(e-) + ArOh --> RH + ArO(e-) R(e-) is oxidizing agent. ArOH is reducing agent. RH is reduced ArO(e-) is oxidized. Is this correct? And the

    asked by Anonymous on April 10, 2016
  52. chemistry redox

    can someone check my labels for the reaction of a radical with an extra electron, (R(e-)) and an antioxidant, ArOH. R(e-) + ArOh --> RH + ArO(e-) R(e-) is oxidizing agent. ArOH is reducing agent. RH is reduced ArO(e-) is oxidized. Is this correct? And the

    asked by check my work :) on April 9, 2016
  53. Chemistry

    a) An equilibrium exists between three chemical species in the blood , Hemoglobin, oxygenated hemoglobin and oxygen. Using the symbols Hb for hemoglobin , O2 for oxygen and HbO2 for oxygenated hemoglobin write out the equilibrium reaction. If you have

    asked by AB on November 26, 2011
  54. Math

    Help pls A number cube is rolled 450 times. The number 3 comes up 67 times. a. What is the theoretical probability of rolling a 3? Write your answer as a fraction in simplest form b. What is the experimental probability of rolling a 3? Write your answer as

    asked by BlueJay-_- on May 21, 2018
  55. Chemistry

    Please help me verify: The following reactions are involved in the formation of acid rain. Use oxidation numbers to identify which of these reactions are REDOX reactions. a. 2SO2(g) + O2(g) �� 2SO2(g) -2 -2 0 -2 -2 No change - not REDOX

    asked by Dexter on June 17, 2011
  56. Chemistry

    The hydroxide ion reacts with the H2PO2 ion according to the following equation: OH^- + H2PO2^- > HPO2^-2 + H2 The rate law for this reaction rate is R=k[OH^-]^2[H2PO^-2]. What will be the change in the reaction rate if the H2PO2 ion concentration is

    asked by Anonymous on July 9, 2015
  57. English

    posted by rfvv Friday, April 13, 2018 at 9:46pm posted by rfvv Monday, April 9, 2018 at 10:21pm 1. What is the root verb of 'seen'? 2. What is the base verb of 'seen'? 3. What is the bare infinitive of 'seen'? 4. What is the verb root of 'seen'? 5. What is

    asked by rfvv on April 15, 2018
  58. chemistry

    if 37.9 liters of NO at .993atm and 146 degrees celcius are decomposed by the reaction 2NO-->N2+O2 how many grams of nitrogen will be formed... could you show mw step bu step how to do this ? thanks....i have finals tommorrow.... i need

    asked by TIFFANY on January 11, 2007
  59. Chemistry

    The decomposition of IBr(g)into I2 (g) and Br2 (g) is first order in IBr with k = 0.00255/sec. (a)Starting with [IBr] = 1.50M, what will [IBr] become after 2.50 minutes? (b)How long, in minutes, will it take for [IBr] to go from 0.500M to 0.100M? (c)What

    asked by David on January 25, 2011
  60. Chemistry

    Consider the following reaction: CO(g)+H2O(g)⇌CO2(g)+H2(g) Kp=0.0611 at 2000 K A reaction mixture initially contains a CO partial pressure of 1348torr and a H2O partial pressure of 1780torr at 2000 K. Calculate the equilibrium partial pressure of CO2.

    asked by Ryan on February 25, 2015
  61. chemistry

    1. A student wanted to measure the amounts of (Ca2+) in the human blood. She got 1.00ml which she treated with Na2C2O4 solution. The resulting Ca2C2O4 precipitate was filtered and dissolved in dilute H2SO4 to release C2O42- into solution and allow it to be

    asked by victor2 on August 5, 2011
  62. science

    I need a little assistance. Can you help? The question which seems to be simple enough is What is a physical change? My son answered - A physical change is any change that alters the form or appearance of matter into a different substance. I do not agree.

    asked by From a Mom on September 18, 2012
  63. 8th Grade math PLEASE CHECK MY ANSWERES

    1.Write the number in standard form: 7.1x10^4 A)710 B)7,100 C)71,000 D)710,000*** 2.Write the number in standard form: 5.01x10^-3 A)5,010 B)0.501 C)0.0501 D)0.00501*** 3.Multiply (2.0x10^4)(3.0x10^3)=? A)6.0x10^7*** B)6.0x10^12 C)6.0x10^5 D)6.0x10^43 Add.

    asked by Connections Academy Student on October 2, 2015
  64. Chemistry

    How did the metal atoms become ions? Metal atoms became ions by losing electrons to form positively charged ions(cations). How did the nonmetal atoms become ions? Nonmetal atoms became ions by gaining electrons to form negative ions(anions).

    asked by Damon on July 8, 2010
  65. Chemistry

    1. Can I2 react with Cyclohexane to form any product (without or without spectroscophic properties)? 2. Can I2 react with t-butyl or n-butyl alcohol to form any organic product? 3. What is the complex formed between I2 and t-butyl alcohol? Is this complex

    asked by John on October 18, 2010
  66. Pre-Calculus

    The treatment of a certain viral disease requires a combination dose of drugs D1 and D2. Each unit of D1 contains 1 milligram of factor X and 2 milligrams of factor Y, and each unit of D2 contains 2 milligrams of factor X and 3 milligrams of factor Y. If

    asked by Andrea on July 24, 2008
  67. ~CHEM~

    If I had an equilibrium of CH3CO2(aq) + H(aq) CH3CO2H(aq) and the applied stress was HCl and NaOH what observations should I expect and what direction would the equliibrium shift? Same goes to this question equilibrium:Fe(aq) + SCN(aq) FeSCN(aq) the

    asked by Jason on May 16, 2007
  68. chemistry, please help

    2NO2(g)--> 2NO(g) + O2(g) , H=+114.2kJ (Note: H, S, G all have a degree sign next to them) NO: H(enthalpy)=90.3kJ/mol, S(entropy)=210.7J/mol*K, G(gibbs energy)=86.6 O2: H(enthalpy)=0, S(entropy)=?, G(gibbs energy)=0 kJ/mol NO2: H(enthalpy)=33.2, S=239.9,

    asked by apoorva on February 4, 2008
  69. Solving for x

    ((2X-14Cos45)/(49+X^2-14XCos45))+0.3536 = 0 Solve to find the value of X Change cos 45 to sqrt 2 and rewrite the equation in the form a x^2 + bx + c = 0 Start out by rewriting it as 2x - 9.8995 = (-0.3536)(49 + x^2 - 9.8995 x) Conimue until you get the

    asked by Sarah on June 15, 2005
  70. science

    1. a stream of water will bend toward a balloon that has been rubbed on a sweater to generate static charge. Which property of water is responsible for this behavior? A. THE polarity of the water molecule b. the ability of water to form hydrogen bonds with

    asked by oto on September 8, 2016
  71. Chemistry

    compared to an ordinary chemical reaction, a fission reaction will 1 release smaller amounts of energy 2 release larger amounts of energy 3 absorb smaller amounts of energy 4 absorb larger amounts of energy is it 2 ?

    asked by Jazmin on May 5, 2011
  72. chemsitry

    acetylsalicylic acid (aspirin) HC9H7O4 is the most widely used pain reliever and fever reducer. Find the PH of 0.040 M aqueous aspirin at body temperature (Ka at 37 C = 3.6 x 10-4) is this correct? initial concentration is 0.040 M. let change in

    asked by patrick on October 4, 2015
  73. chemistry

    acetylsalicylic acid (aspirin) HC9H7O4 is the most widely used pain reliever and fever reducer. Find the PH of 0.040 M aqueous aspirin at body temperature (Ka at 37 C = 3.6 x 10-4) is this correct? initial concentration is 0.040 M. let change in

    asked by patrick on October 4, 2015
  74. science

    these are my homework questions can you answer any???there are 4 1 A pupil placed some magnesium in a gas jar of oxygen How could the rate of reaction between these substances be increased 2 Complete the word equation for the reation magnesium and oxygen 3

    asked by lauren on November 29, 2006
  75. Sociology

    I'm working on my sociology assignment on American Family. I have to answer questions on how today's american family have changed from watching old and current tv shows that my teacher assigned to us. (The 70's show and Gilmore Girls) Now, I watched some

    asked by THE 70's SHOW!! on April 17, 2012
  76. Chemistry

    Thinking about the uses of radioactive isotopes, which statement is true? A. The iodine isotope, I-27, is used to diagnose thyroid disorders. B. Radiation may be detected because it ionizes the atoms it affects. C. It’s clearly understood that

    asked by Sadie on June 25, 2010
  77. Algebra III / Core II

    It has been since the beginning of last year since I last did this math and the teacher I currently have is a sub and doesn't know what the heck she's doing either - so if anyone can help me, that'd be oh so amazing! a. Solve d=rt in terms of d and t. b.

    asked by Kristen on September 7, 2008
  78. Math

    CHECK AND CORRECT MY ANSWERS!! PLEASE!!:D:D Write the ratio in the simplest form. 45:15 9:3 3:1*** 1:3 4:1 Solve the following proportion. (solve p) p/3 = 8/12 2*** 8 12 24 A recipe calls for 3 cups of flour to make 3 dozen cookies. Use the proportion to

    asked by Anonymous on November 14, 2017
  79. Chemistry

    out of these conditions, which would result in fastest reaction? a. 2.0M HCL, powedered CaCO3 chip, 50 degrees celsius b. 6.0M HCL, CaCO3 chip, 25 degrees celsius c. 6.0M HCL, powdered CaCO3, 50 degrees celsius. d. 2.0M HCL, CaCO3 chip, 50 degrees celsius.

    asked by Shreya on September 26, 2012
  80. Mya PLEASE :)

    What is the correct form of lequel to replace the follow noun: le balcon - Lesquels - Lequel - Lesquelles - Laquelle What is the correct form of lequel to replace the follow noun:le magasin - Lesquelles - Lesquels - Lequel - Laquelle What is the correct

    asked by French on March 10, 2015
  81. Biochemistry

    You wish to measure the change in G°'for the hydrolysis of ATP: ATP ---> ADP + Pi but the equilibrium for the hydrolysis lies so far toward products that analysis of the ATP concentration at equilibrium is neither practical nor accurate. However, you have

    asked by Mallory on September 12, 2009
  82. Math/Algebra do u know how to do slope intercept?

    The following problems are in slope,point slope, and slope intercept forms of a line. Could you check these thanks. Find the slope intercept form of a line that passes through these two points (-4,4) and (2,1) Answer: y= -1/2x-2 Find the slope intercept

    asked by Chico on March 26, 2009
  83. Chem HW!! Difficult! HELP!

    Urea (H2NCONH2) is used extensively as a nitrogen source in fertilizers. It is produced commercially from the reaction of ammonia and carbon dioxide. 2 NH3(g) + CO2(g) ---Heat pressure---> H2NCONH2(s) + H2O(g) Ammonia gas at 223°C and 90. atm flows into a

    asked by Jane on April 5, 2013
  84. Maths

    The first odd number can be expressed as 1 = 1squared - 0squared. The second odd number can be expressed as 3 = 2squared - 1squared. The third odd number can be expressed as 5 = 3squared - 2squeared. a) Express the fourth odd number in this form. (Am I

    asked by Stephanie on November 20, 2008
  85. Chemistry

    Translate the following sentences into unbalanced formula equations: (1) silver nitrate and soduim chloride react to form silver chloride and sodium nitrate. (2) iron (III) sulfate and calcium hydroxide react to form iron (III) hydroxide and calcium

    asked by M on October 25, 2007
  86. Science, chemistry

    Electrophilic substitutions reaction of pyrrole

    asked by Pronob on March 4, 2018
  87. chem - asap

    write the equation for the reaction of fecl2 with k3[fe(cn)6]???

    asked by Smarth on October 2, 2011
  88. Chem

    What is the product for the reaction of Ni(s) + 2Na^+(aq)? I don't think this is possible no?

    asked by Selena on March 2, 2014
  89. chemistry

    plot (IO3) vs. reaction Time(s)

    asked by amine on May 9, 2012
  90. chemistry

    what is a complete and incomplete combustion reaction ??

    asked by sunny on March 30, 2014
  91. chemistry

    how is it possible for the same element to be oxidized in one reaction and reduced in another?

    asked by Sara on February 25, 2013
  92. Chem

    What will the products be for Ni(s) + 2Na^+(aq)? I don't think this is even possible, so will this reaction even be possible?

    asked by Selena on March 3, 2014
  93. chemistry

    ferusamoniumsulphate reaction with sulphuric acid

    asked by ferus on August 16, 2014
  94. Chemistry

    what are the products of the reaction? Cu3PO4 + HCl =

    asked by Jim on May 23, 2010
  95. Chemistry

    What is the chemical reaction for: The oxidation of 2-pentanol

    asked by Ceamus Angelina on June 3, 2018
  96. Chemistry

    How do you find generic rate of a reaction?

    asked by Anonymous on February 24, 2009

    write the equation for the reaction of fecl2 with k3[fe(cn)6]???

    asked by david on October 3, 2011
  98. chemistry

    Why is rate of reaction important to scientists?

    asked by fia on October 21, 2009
  99. American History

    What was the action and reaction of the Treatyof Paris?

    asked by Ang on November 12, 2008
  100. Redox Half Reactions

    Half reaction of 2 Al2O3 + 3 C → 4 Al + 3 CO2

    asked by Jonathan on May 24, 2008