1. math

    4.10:1.90 in the form of n:1

    asked by osi on March 31, 2012
  2. engineering

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

    asked by ashley on September 4, 2008
  3. 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
  4. 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 4, 2010
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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 7, 2011
  10. 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 7, 2011
  11. 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
  12. 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
  13. 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
  14. 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
  15. algebra 3

    what is the equation of the line with {3,3} and is perpendicular to the line y= negative 2x plus 3 The slope of the line is -2. The slope of a line perpendicular to this one must be its negative reciprocal, or 1/2. Use the point-slope form to find the

    asked by Darius Graham on January 12, 2007
  16. 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 2, 2008
  17. Pre-calculus- URGENT

    Convert the rectangular coordinate (-8,i (square root of 3) into polar coordinates. How do I do this?? I tried every way I knew of to convert the y coordinate (i (square root of three)) to polar form, but it didn't work. I think that the polar form of the

    asked by Ellie on September 13, 2015
  18. Science

    Humidity is the amount of water vapor in the air at a given time. At warm temperatures, air can hold more moisture than it can at cold temperatures. Relative humidity is the amount of vapor the air is holding expressed as a percentage of the amount the air

    asked by Jimmy on July 19, 2008
  19. organic chemistry

    what are the formulas of the salts that may precipitate when the reaction mxture is cooled?

    asked by Ivy on October 24, 2011
  20. Science

    What Type of Simple Chemical Reaction Occurs in Fireworks?

    asked by Brianna on September 18, 2014
  21. chem101

    will the following reaction take place nh3+h2o= nh2 + h3o

    asked by wendy on April 8, 2010
  22. 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 23, 2012
  23. science, biology

    what evidence shows that the burning of methane is a chemical reaction?

    asked by me on March 1, 2009
  24. chemistry

    What functional group(s) must be present in a monomer of a condensation reaction?

    asked by Alex on May 8, 2008
  25. Science

    In the reaction X+Y (R) Z, Z is the A)Substrate B)Product C)Enzyme D)Carbon Molecule

    asked by Jon on October 25, 2011
  26. Science

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

    asked by Anonymous on November 5, 2018
  27. 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
  28. Chem

    Write the balanced overall reaction from these unbalanced half-reactions ln--->ln^3+ Cd^2+--->Cd

    asked by Joe on April 17, 2014
  29. chemistry

    ferus amonium sulphate reaction with sulphuric acid

    asked by ferus on August 16, 2014
  30. chemistry

    give the state symbols of the reaction: 2H2 +O2 =2H2O

    asked by christiana on September 12, 2011
  31. chemistry

    consider the following equilibrum reaction: 2NO yield N2 + O2. Take:delta H=-18.0KJ/M

    asked by faith on March 13, 2012
  32. 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
  33. chemistry

    For the reaction: 2SO2(g) + O2(g) = 2SO3(g) conducted at 25°C and 1 atm. Calculate H°, S°, G°

    asked by P on February 27, 2015
  34. chemistry

    consider the following equilibrum reaction: 2NO yield N2 + O2. Take:delta H=-18.0KJ/M

    asked by faith on March 13, 2012
  35. Chemistry

    N2 + 3H2 --> 2NH3 how many grams of ammonia is produced in the reaction?

    asked by Christie on March 13, 2013
  36. 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 22, 2012
  37. Chemistry

    What is the balanced equation for the reaction of 3.000 g of K2CO3 and HCl?

    asked by Amber on October 17, 2010
  38. English

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

    asked by Lorielle on January 25, 2010
  39. science

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

    asked by nina on February 8, 2009
  40. 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
  41. chemistry

    how does an increase in pressure affect the following reaction? C2H2(g)+H2(g) C2H4(g)

    asked by Anonymous on April 15, 2013
  42. chemistry

    Does particle size have more or less of an effect on the rate of reaction than temperature?

    asked by cael on April 5, 2008
  43. Chemistry

    Is an endothermic reaction more likely to be spontaneous at a higher or lower temperature??

    asked by Anonymous on April 13, 2012
  44. chemistry

    According to this chemical reaction, which is the number of grams of Fe produce from 14 moles of H2?

    asked by Ana on March 31, 2010
  45. Chemistry

    What is the theoretical yield of PI3 from the reaction of 27.0 g of P and 68.0 g I2? 2P(s)+3I2(s) 2PI3(s)

    asked by Becca on December 8, 2010
  46. chemestry

    given 43 moles of KCl how much HNO3 is needed to complet the reaction

    asked by juan on December 8, 2010
  47. chemistry

    your reactants are two compounds composed of ions. what type of reaction do you probably have?

    asked by melissa on April 17, 2009
  48. chemistry

    How to solve CoCl2+HO2- ------> Co(OH)3+ Cl- by half reaction method

    asked by Pratik Rathi on July 28, 2016
  49. english

    In "A Day's Wait," how can the father's reaction to his son's concern best be described?

    asked by Mister Max on April 21, 2018
  50. chemistry

    what amount of ethanol is needed for combustion reaction for a 20 oz bottle?

    asked by Anonymous on December 12, 2011
  51. Organic Chemistry

    what is the major product of a reaction with 1-butene and Br2 in water?

    asked by DJ on October 23, 2012
  52. Gen Chem

    Can the rate of a nuclear reaction be changed by an increase of temperature?

    asked by Sarah on March 29, 2008
  53. English Literature

    Realism arose as a reaction to a. naturalism b. regionalism c. ramanticism

    asked by Anonymous on October 1, 2018
  54. Psychology

    How could having a Type A personality affect a person’s reaction to stress?

    asked by Aida on October 22, 2009
  55. Chemistry

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

    asked by Toni on January 11, 2013
  56. science

    Write an equation to show reaction of pop with water

    asked by raj on August 3, 2016
  57. chem

    Determine the equilibrium constant for the following reaction. 2 Fe3+(aq) + H2(g) 2 Fe2+(aq) + 2 H+(aq)

    asked by amelia on June 22, 2013
  58. science

    explain the Eutectic and Eutectoid reaction in cast irons

    asked by Andy on April 18, 2014
  59. Chemistry

    In the. Reaction (Na2co3+CaCl2-->2NaCl+caco3) The precipitate is :

    asked by Mariam on April 20, 2014
  60. chemistry

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

    asked by chemistry on April 4, 2018
  61. reading

    Describe Ralph's physical features and also his reaction to being on the island

    asked by juan on April 4, 2008
  62. Chemistry

    AP Chem - Which element is oxidized in the following reaction: CuO(s) + H2 (g)  Cu(s) + H2O (l)

    asked by Dani on May 22, 2015
  63. Chemistry Check

    Which one of the following substances is the product of this combination reaction? Al(s) + I2(s) => ______ For this it would be AlI3 ?

    asked by Amy~ on August 31, 2010
  64. Chemistry

    For the reaction Zn(OH)2(s)+4CN-(aq)->Zn(CN)4 2-(aq)+2OH-(aq) find [CN-] when 8.5 g of Zn(OH)2 are dissolved in 1.00 L of solution.

    asked by Tyler on November 10, 2013
  65. chemistry

    What are the products of the reaction between nitrous acid and strontium hydroxide?

    asked by Candy on April 20, 2014
  66. chemisrty

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

    asked by laquisha on November 27, 2012
  67. PHYSICS

    What reaction occurs between hydrogen and helium which gives the heat and of the sun

    asked by STEVIUM on January 26, 2016
  68. Chemistry

    Write the Kc expression for the following reaction: Fe3+ + SCN- = FeSCN2+

    asked by Aiyana M. on February 20, 2017
  69. chemistry

    what mass of excess reactant remians when the reaction is completed?

    asked by dennis on February 13, 2016
  70. chemistry

    write the balanced half reaction for the conversion of Cl2(g)to Cl-(aq)

    asked by amethyst on May 12, 2008
  71. chemistry

    in a exothermic reaction temperature changed from 30 to 43, reasons why I got those answers

    asked by Jake on November 9, 2011
  72. 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 12, 2015
  73. chemistry

    What mass of magnesium chloride is formed in the reaction between 7 g of Mg and 7.9 g of Cl2

    asked by anonymous on October 23, 2013
  74. Chemistry

    What is the chemical reaction between Phosphoric Acid and Disodium Phosphate?

    asked by Abdul on August 23, 2011
  75. chemistry

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

    asked by irma on March 4, 2015
  76. 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
  77. Physical science

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

    asked by Siphelele on August 22, 2014
  78. biology

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

    asked by darlene on August 25, 2011
  79. 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
  80. Science

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

    asked by Shantelle on October 30, 2008
  81. chemistry... HELPP

    What is the cell potential for the reaction Mg(s) + Fe^2+(aq) -----> Mg^2+(aq) + Fe (s) at 63 degrees celsius when [Fe^2+]= 3.30 M and [Mg^2+]= 0.110 M

    asked by Angie on November 3, 2012
  82. chemastrey

    of exhow many grams of no2 can be produced by the reaction of excess o2 with 19.8 of no

    asked by jacob on November 2, 2011
  83. chemistry

    is putting gas in a vehicle a physical or chemical reaction

    asked by kim on March 6, 2013
  84. Chemistry

    How do I balance the following into an equation? 10 mL of 2.0 M HCl is react with 8 mL of 1.7 M Ca(OH)2 in a neutralization reaction.

    asked by Please HELP!!! on April 27, 2011
  85. ap chemistry

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

    asked by sara on October 29, 2006
  86. science

    write the balaced half-reaction for the conversion of Fe(s) to Fe2+(aq)

    asked by amethyst on May 11, 2008
  87. Chemistry

    what is the equation for the reaction of Cu(NH3)subscript2(SO4) with NaOH?

    asked by dave on March 17, 2011
  88. kumar

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

    asked by pawan on May 3, 2016
  89. chemistry

    what mass of H2(g) is produced from the reaction of 5.2g Fe(s) with excess hydrochloric acid?

    asked by Susan on April 3, 2012
  90. Chemistry

    how can magnesium chloride be lost in a reaction and how can we ensure that it is pure?

    asked by Stoof on January 21, 2016
  91. chem

    What functional group(s) must be present in a monomer of a condensation reaction.

    asked by 12mr5 on May 9, 2008
  92. chemistry

    what is the rate law for NO+O3=NO2+O2 in second order reaction if [NO] Doubled

    asked by mercy on April 6, 2015
  93. AP Chemistry

    What effect would a catalyst have on the rate of reaction for the decomposition of ozone?

    asked by Corneil on October 11, 2012
  94. CHEMISTRY

    What will be the reaction rate (formation of C) when the concentrations of A & B are 0.150 M and 0.250 M respectively?

    asked by Yubellkis on February 6, 2017
  95. chemistry

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

    asked by anon on October 26, 2010
  96. English

    low sleep or sleepiness what is the effect on our reaction time?

    asked by Stressed student on June 20, 2017
  97. 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
  98. Science

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

    asked by Vanshika on June 22, 2016
  99. ap chem

    What volume of 5M HF will 4g Ca react completely according to the reaction Ca+2HF-->O+CaF2+H2

    asked by josh sears on October 24, 2010
  100. Chemistry

    For a certain reaction, Kp = 3.54 at 325 C. Find delta G 598 K in kJ/mol.

    asked by Anonymous on January 30, 2015