1. algebra

    ------Suppose someone opens the valve on a large water tank so that water drains out. Choose a starting volume of water in the tank (from 100 to 500 gallons), and choose how much water drains out each day (from 2 to 5 gallons). Write the equation that

    asked by Olive on October 6, 2013
  2. Chemistry

    42. Tell the function of the moderator and control rods in a nuclear reactor. I found this answer on google..is it correct? The function of the moderator is to slow down the neutrons produced by fission to greatly increase the probably that they will go on

    asked by mysterychicken on October 30, 2010
  3. Chemistry

    Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to change Na as a solid to Na

    asked by Fiona on April 30, 2007
  4. Algebra

    Need help with two questions. I've been stuck on them for a while now. 1) Find a general form of an equation of the line through the point A that satisfies the given condition. A(−2, 5) slope 3/4 2)Find a general form of an equation of the line through

    asked by Jim on February 25, 2013
  5. chemistry

    Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes

    asked by shadow on November 19, 2013
  6. Chemistry

    A 100 L reaction container is charged with 0.724 mol of NOBr, which decomposes at a certain temperature** (say between 100 and 150 oC) according to the following reaction: NOBr(g) ↔ NO(g) + 0.5Br2(g) At equilibrium the bromine concentration is 1.82x10-3

    asked by Anonymous on February 20, 2013
  7. chemistry - Dr.Bob222 please help

    Hi Everyone, Anyone want to try giving these a shot? The right electrode in a cell is a piece of copper immersed in a 1.00 L solution of 0.0701 F copper sulfate. The left electrode is a galvanized nail (i.e., an iron nail that is completely coated with a

    asked by ajones51 on November 7, 2006
  8. Physics

    Physics question on identify the reaction? I am having trouble with the question a, b, and c in this physics problem: One or more external forces are exerted on each object enclosed in a dashed box shown in the figure below. Identify the reaction to each

    asked by Lin on February 27, 2011
  9. Chemistry

    1. Which of the following is one way to prevent the corrosion of iron? A. Paint exposed iron parts with protective paint. B. Protect the iron from polluted air. C. Add carbon to the iron. D. Let the iron develop a natural coat of carbonate. 2. The source

    asked by StarBuddy on October 3, 2013
  10. Algebra 1

    1) Find the possible values of a, if the distance between the points is 5, and the coordinates are (1, 1) and (4, a). I don't know how to solve this one. 2) in a right triangle the length of the hypotenuse is 14 and the length b of one of the legs is 8.

    asked by Eri on May 31, 2013
  11. chemistry

    Hey...how r u guys..thanks for helping me on my previous questions...can u help me solve two questions and check one? Thanks, all the questions are related to the info given: In some industrial processes, sodium chromate is added to water coolants. When

    asked by David on June 18, 2006
  12. Chemstry

    I just copied this because i have a couple more questions on this part.... Sulfuric acid/ Lead Battery: -the electrodes for the battery are composed of Pb(s), PbO2, and/or PbSO4. What are the half reaction occuring at each electrode? include electrolysis

    asked by Sara on April 28, 2008
  13. ChemistryDrBob222

    Arrows disappeared from below added them back to the equations. 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

    asked by David on January 26, 2011
  14. Math

    Find the product 8 1/3 x 3/5 in simplest form Find the product 5 1/2 x 3 1/3 in simplest form Use distributive property to find the product 4 2/5 x 10

    asked by Heather on January 28, 2015
  15. English

    1. My hobby is internet games and paper folding. 2. My hobbies are internet games and paper folding. ----------- Which one is grammatical? 3. My hobby is exchanging text messages on Kakao Talk on my smart phone. 4. My hobby is talking with my friends on

    asked by rfvv on March 23, 2016
  16. Spanish

    This is my assignment: Imagine you are babysitting your little brother. Write a total of 5 Spanish sentences using tú commands telling your little brother what to do. Write 3 sentences using regular verbs. Write 2 sentences using irregular verbs. You can

    asked by Jessie on May 16, 2014
  17. Chemistry

    When solid magnesium nitride reacts with water the reaction produces solid magnesium hydroxide and ammonia gas. If 22.9 grams of magnesium nitride are added to 31.0 grams of water, how many liters of ammonia should be produced (assuming standard

    asked by Jay on September 14, 2017
  18. Chemistry

    Hi I hope you can understand this...the Na ion is attached to the oxygen using ionic bonding. The \/ are meant to symbolize the hydrocarbon chain. The || is a double bond that bonds oxgen to carbon. O || Na O/\/\/\/\/\/ + CaCl2 -> ? + NaCl To give you some

    asked by Me on January 20, 2011
  19. English

    1. We decided to go abroad. 2. We made up our mind to go abroad. 3. We made a decision to go abroad. 4. We made up our minds to go abroad. (Are they all interchangable? Do we have to use the plural form 'minds' or the singular form 'mind'?) 5. We

    asked by rfvv on May 2, 2010
  20. Chemistry

    Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok

    asked by Kate on July 3, 2010
  21. Algebra 2/Statistics

    From a squad of 12 cheerleaders, 10 will assemble themselves into a 4-level pyramid at the Homecoming rally. 1.) How many different combinations of cheerleaders can be used to build the pyramid? For this I got 12C10=66......Right or Wrong? 2.) The coach

    asked by Jordan on April 30, 2015
  22. Math

    In an isosceles triangle, the perimeter is 8 more than 2 times on of the legs. If the perimeter is 28 in, find the length of the base. A. 16 in B. 18 in C. 10 in D. 8 in Given triangle ABC with A(-3, 2), B(-1, -4), and C(4, 1), write the equation for the

    asked by SkatingDJ on January 14, 2016
  23. calculus totally confused

    find a first degree polynomial function p(1) whose value and slope agree with the value and slope of f at x=c. i think you use taylor series for this f(x)=4/sqrt(x), c=1 i'm totally confused on how to do it. i know you find the derivative but how do i get

    asked by david on March 13, 2007
  24. Art

    I am suppose to look at the sculpture Madonna and Child within an Arch by Donatello. I am suppose to say what elements of art are used in this sculpture. The elements of art in case you don't know are form texture color shape line and value. I said this

    asked by Bella on May 16, 2012
  25. Science please help

    Draw Bohr diagrams of a magnesium atom bonding with fluorine atoms. Draw atoms then electron transfer and finally the ions that form. What type of bonding occurs? Draw Bohr diagrams of 2 hyrdogen atoms bonding with an oxygen atom by sharing electrons to

    asked by Anonymous on March 3, 2014
  26. Urgent Spanish Check

    A) Read the following sentence and choose which word is not correct in the context of the sentence. 1) La examen es difícil. La? 2) El árbol es verdes. el? B) The following sentence is written in singular form. Read the sentence, then choose the correct

    asked by Katt on September 17, 2014
  27. Math

    A piece of wire is bent to form a square of area 121cm. Calculate: a)the length of each side of the square. b)the perimeter of the square. The piece of wire is now bent to form a circle using π=3.14 Calculate: a)the radius of the circle b)the area of the

    asked by Baller T on September 24, 2015
  28. Chemistry

    A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an

    asked by Chen on November 6, 2011
  29. Chemistry

    A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an

    asked by Chen on November 6, 2011
  30. chem question i need help

    I need help on this question. Could someone give me tips on how to solve it? thanks An emergency breathing apparatus often placed in mines works via the following chemical reaction: 4KO2(s) + 2CO2(g) to make 2K2CO3(s) + O2(g) If the oxygen supply becomes

    asked by Jenn on February 27, 2007
  31. chemistry

    Write the equation for the reaction, if any, that occurs when each of the following experiments is performed under standard conditions. a) crystals of iodine are added to an aqueous solution of potassium bromide. b) liquid bromine is added to an aqueous

    asked by Krystal on May 13, 2007
  32. Math22

    1. Write the composite function in the form f(g(x)). [Identify the inner function u = g(x) and the outer function y = f(u).] y= (g(x), f(u)) = 2. Write the composite function in the form f(g(x)). [Identify the inner function u = g(x) and the outer function

    asked by Anonymous on October 7, 2014
  33. Chemistry II

    C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341

    asked by Jayd on May 20, 2007
  34. math

    4.10:1.90 in the form of n:1

    asked by osi on March 30, 2012
  35. engineering

    what is the SI form A)MN/ks^2 B)kN/ms

    asked by ashley on September 3, 2008
  36. quadratic

    what is -x^2+4=(3x-1)^2 in the form ax^2+bx+c=0

    asked by zachary on July 25, 2009
  37. Higher Maths

    Show that these three points , P(-8,3), Q(-3,4),R(-6,-7), Form a right angled triangle and name the right angle? There are two ways of doing this: 1) determine the slopes for all lines, and the pair that have a right angle will have a negative inverse

    asked by R0SS on September 1, 2005
  38. chem

    "The percentage of sodium hydrogen carbonate, NaHCO3, in a powder for stomach upsets is found by titrating .275 M hydrochloric acid. if 15.5 mL of hydrochloric acid is required to react with .500 g of the sample, what is the percentage of sodium hydrogen

    asked by Dan on October 19, 2006
  39. CHEM

    1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas? What is the limiting reagent? 2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2. What is the limiting reagent? 3. The

    asked by Anonymous on June 1, 2008
  40. math please help

    i posted this can you explain to me how to do this question i know i have to use differential equations but im not sure how to form an equation for inversely proportional question states grain is being poured at a steady rate to form a pile with height h,

    asked by lucy on February 2, 2010
  41. math

    i posted this can you explain to me how to do this question i know i have to use differential equations but im not sure how to form an equation for inversely proportional question states grain is being poured at a steady rate to form a pile with height h,

    asked by lucy on February 2, 2010
  42. math

    i posted this can you explain to me how to do this question i know i have to use differential equations but im not sure how to form an equation for inversely proportional question states grain is being poured at a steady rate to form a pile with height h,

    asked by lucy on February 1, 2010
  43. Chemistry

    Isopropyl alcohol, C3H7OH is an organic compound. It melts at -89 C and boils at 82.6 C. IT has a heat fusion of 88 J/g and a heat of vaporization of 733.33 J/g. The specific heat of liquid isopropyl alcohol is 2.68 J/g-C. The specific heat of its solid

    asked by Sean Tristan on May 16, 2016
  44. science

    Name the type of reaction that the equation represents? 2Cu + O2 -------> 2CuO

    asked by Natalie on February 11, 2012
  45. Science:chemistry

    Chlorine + sodium iodide does it react if it does what is the product of the reaction

    asked by Cindy on November 5, 2018
  46. Chemistry

    How do I identify the reducing agent in a reaction of magnesium with oxygen?

    asked by Jasmine on May 13, 2012
  47. Science

    Chlorine + sodium iodide does react if it does what is the product of the reaction

    asked by Anonymous on November 5, 2018

    How many oxidation states Should a substance have at least to undergo Disproportionation reaction ? thanks

    asked by MAD on July 9, 2014
  49. 7th grade chemistry

    how is potassium sulfate prepared?explain with chemical reaction.

    asked by R.M.Sabarish on April 14, 2010
  50. Chemistry

    need help to balance half reaction in basic solution IO3 to I2

    asked by Shana on July 27, 2013
  51. chemistry

    What is the equation that represents the reaction of esterification of crystal violet? Thanks

    asked by irma on March 4, 2015
  52. kumar

    The addition of a catalyst during a chemial reaction alters which of the following quantities?

    asked by pawan on May 3, 2016
  53. US history

    what was the parliament's reaction to the Boston Tea Party of 1773 ?

    asked by brianna on December 4, 2008
  54. Chemistry

    For the following fusion reaction, calculate the change in energy per mole. 2/1 H + 3/2 He -> 4/2 He + 1/1 H

    asked by Anonymous on June 13, 2012
  55. chemistry

    briefly explain how to demostrate that all the reactants in a neutralization reaction has been used up

    asked by Daniel on May 30, 2012
  56. chem

    What does it mean when the sulfuric acid in a chemical reaction is written ABOVE the arrow?

    asked by chrissy on August 17, 2009
  57. science

    what substance is being reduced in the following redox reaction? HgCl2 + Sn^2 = Sn^4 + Hg2Cl2 + Cl-

    asked by akos on June 29, 2012
  58. Chemistry

    2C10H22 + 31O2 = 20Co2 + 22H2O What kind of reaction is this?

    asked by Isabella on February 19, 2012
  59. chemestry

    consider the reaction 2N2O(g) == O2(g)+2N2(g).which of the following will cause a shift in the equilibrium to the left?

    asked by sara on November 1, 2014
  60. Chemistry

    Given the following reaction at equilibrium, if Kc = 1.90 x 1019 at 25.0 °C, Kp = __________. H2 (g) + Br2 (g) ↔ 2 HBr (g)

    asked by Josh G. on November 17, 2012
  61. Chemistry

    How many atoms of iron will be produced from the reaction of 50 g of hematite and 25 g of carbon?

    asked by Amanda on January 11, 2015
  62. ap chemistry

    What product is formed by this reaction: H2 + (CH)2 Answered the original post below.

    asked by sara on October 29, 2006
  63. Chemistry

    C3H8 +________O2 ---------3CO+4H2O . Which is the balance the reaction A. 1 B. 7 C. 5 D.3

    asked by Janet on January 20, 2018
  64. wvuit

    calculate the enthalpy change for the reaction n2h4(l) + 02(g) --> n2(g) + 2h20(l)

    asked by elizabeth on February 18, 2012
  65. chemistry

    What element is undergoing reduction in the following reaction? Zn(s) + AgNO3(aq) --> Zn(NO3)2 + 2 Ag(s)

    asked by candace on March 1, 2010
  66. science

    what is the difference between a chemical reaction ans physical separation.

    asked by nina on February 8, 2009
  67. chem

    what mass of Cl2 is produced from the reaction of 665 g of Hal

    asked by Anonymous on April 18, 2016
  68. chemistry

    what is the source of activation energy in an exothermic reaction? Is an example heat?

    asked by chemistry on April 3, 2018
  69. biology

    does dark reaction helps in transmittance and conservation of energy

    asked by AYESHA on June 26, 2014
  70. Science

    Is this statement true or false? An antigen causes an allergic reaction. Please and thank you!

    asked by Shantelle on October 30, 2008
  71. chemistry

    I need the half reactions for this redox reaction: 2KClO3-----> 2KCl + 3 O2

    asked by donna on June 9, 2013
  72. Science

    The reaction between sulphuric acid and iron (III) hydroxide [Fe(OH)3] gives

    asked by Vanshika on June 22, 2016
  73. Science

    What Type of Simple Chemical Reaction Occurs in Fireworks?

    asked by Brianna on September 18, 2014
  74. Chem

    Is this reaction endothermic or exothermic? Ca(C2H3O2)2(s) = Ca2+(aq) + 2C2H3O2-(aq)

    asked by Chris on November 13, 2012
  75. biology

    an organism's reaction to a change in its intenal or external enviroment

    asked by darlene on August 25, 2011
  76. college

    Kp for the reaction CO2(g) + C(s) 2CO(g) is 1.47 at 727°C. Calculate Kc at this temperature

    asked by gggg on July 22, 2012
  77. biology

    Describe the to type of energy changes that can occur in a chemical reaction Thanks

    asked by glenn help help help on February 1, 2012
  78. chemistry

    n the reaction 2CO(g) + O2(g) ® 2CO2(g) what is the correct expression of the rate?

    asked by qwatissia on June 10, 2010
  79. chemisrty

    What is ΔGo at 1000 oC for the following reaction? CaCO3 (s) CaO (s) + CO2 (g)

    asked by laquisha on November 27, 2012
  80. Chemistry

    Balance Redox using reactions by the 1/2 reaction method. NaIO3 (aq) + KI (aq) -->„³ I2 (s)

    asked by Jenny on May 22, 2014


    asked by AYESHA on May 22, 2014
  82. Chemistry

    what type of reaction is AgF + CaCl2 --> AgCL + CaF2 ?

    asked by Toni on January 11, 2013
  83. biology

    how is it possible for an enzyne to lower the required energy of activation for a reaction.

    asked by jessi on December 14, 2010
  84. chemistry

    ferus amonium sulphate reaction with sulphuric acid

    asked by ferus on August 16, 2014
  85. science

    How far does your automobile travel in meters during your reaction time if you are moving at 55 mi/h (25 m/s)?

    asked by Nicole on September 6, 2014
  86. English

    Contrat the reaction of Hamlet, Laertes to their father's death.

    asked by Lorielle on January 25, 2010
  87. chemistry

    Kp for the reaction is 1.47 at 727°S CO2(g) + C(s) 2CO(g) Calculate Kc at this temperature

    asked by ken on July 21, 2012
  88. chemistry

    write a balanced equation for the chain reaction AL2O3

    asked by Nancy on July 13, 2013
  89. Chemistry

    Compute the equilibrium constant for the reaction between Ni 2+ (aq) and Co (s). I'm not sure how to work out this problem. Could you please help me out? thanks.

    asked by Karley on April 22, 2010
  90. Chemistry

    how many electrons take part in redox reaction: Cl2 -> ClO3^-

    asked by yoshii on January 23, 2013
  91. Chemistry

    Calculate delta G of a reaction with equilibrium constant, K= 9.5 x 10^5 at 25 degrees C

    asked by Matthew on July 10, 2013
  92. chemistry

    At 1100 K, Kp = 0.25 for the reaction 2SO2(g) + O2(g) equilibrium with 2SO3(g) What is the value of Kc at this temperature?

    asked by Wolf on October 9, 2007
  93. Physical science

    What did svante arrhenius discover about the reaction between an Acid and a Base?

    asked by Siphelele on August 22, 2014
  94. Chemistry

    Here is a chemical reaction Fe + O2--> Fe2+O3 what was Antonie Lavoiser rusting?

    asked by Anonymous on February 11, 2010
  95. Chemistry

    Will there be a reaction if a magnesium strip is placed in a solution containing Zn2+ ions?

    asked by Sanjay on September 18, 2018
  96. chemistry

    C+HNO3=H2CO3+H2O+NO2 which type of reaction is it.

    asked by RAHUL SAHU on June 7, 2014
  97. chemistry

    how can AgCl(s) be dissolved completely? write an equation for the reaction

    asked by anon on October 25, 2010
  98. chemistry

    The "REVERSIBLE" chemical reaction- A + B C + D Kc = CD / AB =4.4 Concentration at the start and after equilibrium- A = 1.00 M --> (1.00 - X) M B = 2.00 M --> (2.00 - X) M C = 0.00 M --> X M D = 0.00 M --> X M 4.4 = X^2 / (1.00-X)(2.00 - X) I'm not sure

    asked by Saira on February 5, 2009
  99. chemistry

    what type of reaction is 2KCLO3+heat-2KCL+3O2

    asked by cody on July 17, 2008
  100. science

    The rate constants for a first order decay reaction are found to be:

    asked by hermy on January 12, 2013