1. Chemistry

    Is fermentation an irreversible reaction?

    asked by Stoof on September 2, 2015
  2. Science

    Reaction time.experiment

    asked by Tracry on May 2, 2016
  3. science

    iron and sulphur reaction

    asked by suzy on May 23, 2012
  4. Chemistry

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

    asked by mysterychicken on October 26, 2010
  5. chemistry

    Reaction between H2O2 +2NaOH

    asked by Anup on November 21, 2012
  6. science

    what is the reaction between hexane & iodine?

    asked by xyz on May 11, 2010
  7. Chemistry

    Is esterification a condensation reaction?

    asked by Anonymous on January 18, 2014
  8. Chemistry

    Is photosynthesis a reversible reaction?

    asked by Stoof on September 1, 2015
  9. chemistry

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

    asked by hi on September 22, 2013
  10. chemistry

    when will a displacement reaction not occur?

    asked by mike on February 26, 2008
  11. Science--Chemistry

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

    asked by Holly on October 3, 2008
  12. 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
  13. chem

    combination reaction. mg2+o2

    asked by jerry on November 18, 2012
  14. Chem

    NaOH (aq) + Zn (solid) reaction

    asked by John on November 12, 2007
  15. Chemistry 12

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

    asked by JM on May 5, 2011
  16. bmcc

    which of the following is an oxidation reduction reaction ?

    asked by Anonymous on October 18, 2016
  17. Science

    Is photosynthesis a endothermic reaction

    asked by Anonymous on December 15, 2015
  18. science

    describe the reaction of photosynthesis.

    asked by chanell on October 10, 2007
  19. physics

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

    asked by elise on February 10, 2012
  20. chemistry

    Why reversible reaction never complete

    asked by ali on June 21, 2016
  21. physical science

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

    asked by kierra on June 12, 2012
  22. life science

    What does Glycolysis reaction need to proceed?

    asked by shelise on November 23, 2008
  23. chemistry

    A salt is obteind as a reaction between

    asked by Anonymous on November 11, 2011
  24. chemistry

    reaction between Na2a2o3+licro4

    asked by normah on December 26, 2010
  25. chemistry

    for a given reaction, the activation ener

    asked by Tara on December 15, 2010
  26. Chemistry

    Which reaction below represents the second ionization of Lr?

    asked by Savannah on November 15, 2016
  27. biology

    What will happen to the reaction without an enzyme?

    asked by Anonymous on September 26, 2009
  28. chem

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

    asked by will.i.am on January 7, 2013
  29. chemistry

    what happens in a condensation polymerization reaction?

    asked by pj on October 14, 2012
  30. chemistry

    Why is respiration an exothermic reaction?

    asked by josie on June 18, 2014
  31. Chemistry

    If Kc = 7.5E-9 at 1000K for the reaction N2(g)+ O2(g)2NO(g), what is Kc at 1000K for the reaction 2NO(g)N2(g)+ O2(g)?

    asked by Deborah on June 25, 2010
  32. Chemistry

    Is esterification a condensation reaction?

    asked by Anonymous on January 18, 2014
  33. Chemistry

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

    asked by Shelly on November 7, 2011
  34. chem

    complete this reaction 2 NaNO3 + ht →

    asked by dan on November 2, 2010
  35. chemistry

    What is the equilibrium constant for the following reaction? 3A + 2B 2C

    asked by kayla on August 4, 2008
  36. 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
  37. chemistry

    what type of reaction is Al+S8=Al2S3

    asked by angel on March 14, 2012
  38. Chemistry

    What is the reaction of dilute HCl with Zn?

    asked by Anamika on February 23, 2016
  39. Chemistry

    How do you find a reaction order?

    asked by Student on January 22, 2018
  40. Chemistry

    Balance the redox reaction: Ag(aq)+Cu(s)= Ag(s)+Cu(aq)

    asked by Noelle on October 8, 2013
  41. chemistry

    write the reaction for Zn + HCl

    asked by Juanita on March 31, 2011
  42. chemistry

    reaction between CuSo4+NaCl

    asked by robert on November 4, 2008
  43. chemistry

    Provide an example of a spontaneous reaction

    asked by WhatsUp on March 30, 2018
  44. chemistry

    What is the value of x for the following reaction if E∘=1.43V and ΔG∘ = -276kJ ? A+B^x+→A^x++B

    asked by Anisha on April 16, 2014
  45. history: please help for a survey

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

    asked by Mely on September 16, 2011
  46. Chemistry/Science

    Can a reaction order be negative?

    asked by Anonymous on May 20, 2011
  47. 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
  48. GCC


    asked by Maria on October 29, 2013
  49. 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
  50. Chemistry

    Just some homework. Would like to know if I am right, thanks. 1. Adding salt of a weak acid to a solution of the weak acid: a)lowers the concentration of the nonionized acid and the concentration of the H30+ b)lowers the concentration of the nonionized

    asked by Trish on March 27, 2007
  51. science

    In the equation below, suppose 11 grams of Zinc (Zn) react with 12 grams of Hydrogen Chloride (2HCl) to form 16 grams of Zinc Chloride (ZnCl2) and an unknown amount of Hydrogen gas (H2). Zn + 2HCl → ZnCl2 + H2 Based on the Law of Conservation of Mass,

    asked by Luc on November 14, 2016

    convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

    asked by YOSHI on April 16, 2011

    convert the polar equation to rectangular form. 1.) r sec(theta) = 3 2.) r = 4 cos(theta) - 4 sin(theta) convert from rectangular equation to polar form. 1.) x^2 + (y-1)^2 = 1 2.) (x-1)^2 + (y+4)^2 = 17

    asked by YOSHI on April 16, 2011
  54. Mathematics

    (in this question they did not give me any diagrams) use pie 22/7 (a) a piece of wire is bent to form a square of area 121cm squared Calculate the length of each side of the square. Calculate the perimeter of the square. (b) the same piece of wire was bent

    asked by INDIANA on June 5, 2012
  55. 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
  56. 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
  57. 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
  58. English

    1. Sweetheart, did you apply the cosmetics/lotion on your face? 2. Sweetheart, did you wear the cosmetics/lotion on your face? 3. Sweetheart, did you put the cosmetics/lotion on your face? (What about the expressions? Are all expressions grammatical? Do we

    asked by rfvv on March 4, 2010
  59. Math

    The total sales of a company in 2008 were $45,000. In 2011, it grew to $84,000. Use  as the number of years since 2000 and  as the total sales, and answer the following: a. What is the rate of change (slope) in the total sales? b. Write an equation in

    asked by Marta P on January 22, 2012
  60. 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
  61. 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
  62. 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
  63. 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
  64. 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
  65. 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
  66. 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
  67. 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
  68. 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
  69. 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
  70. 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
  71. 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
  72. 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
  73. 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
  74. 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
  75. 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
  76. 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
  77. 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
  78. 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
  79. 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
  80. 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
  81. 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
  82. 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
  83. 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
  84. 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
  85. 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
  86. 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
  87. ~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
  88. 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
  89. 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
  90. 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
  91. 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
  92. 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
  93. 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
  94. 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
  95. 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
  96. 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
  97. 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
  98. 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
  99. 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
  100. 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