1. Astronomy/Conversion

    There are 365.25 days in a year, 24 hours in a day, 60 minutes in an hour, and 60 seconds in a minute. Convert years into seconds. Show your work and keep 5 significant figures. Ok, so finding it is easy (multiply 24, 60, 60 and 365.25) but how does the

    asked by Anonymous on January 16, 2013
  2. math

    Nasmin will construct this object from sheet metal, then coat it with enamel. a) Determine the volume of the object. b) Determine the surface area to be covered with enamel. All exposed faces are to be covered. 20cm and 15cm, 13cm, 6cm and 4cm. please show

    asked by OSAS on April 18, 2017
  3. Help- Precalc

    Suppose that α is an angle such that tan α=(5/7) and sinα0. Find the exact value of sine(α−β) -Direction (Simplify your​ answer, including any radicals. Use integers or fractions for any numbers in the​ expression.) Please show work + answer,

    asked by chizoba on August 13, 2016
  4. Math

    solve by graphing x-2y=8 and x+2y=0 x=8+2y points (10,1), (12,2)would be graphed x=0-2y points (-2,1), (-4,2)would be graphed to form a slope i got the graphing correct but what would be the solution...how would i write it?

    asked by Alea on November 12, 2015
  5. mechanics and heat

    Four point masses are located at the four corners of a rectangle as shown in the figure. Calculate the total moment of inertia of this system measured from (a) axis 1 (b) axis 2 (c) axis 3, and (d) an axis that passes through A and perpendicular to the

    asked by awash on January 7, 2015
  6. Psychology/Science

    I am doing a powerpoint presentation about neurons. I need to include pictures of the nervous system, the central nervous system, neurons, and various things related to the subject. I am having trouble finding these pictures because many of them have very

    asked by Christian on October 17, 2007
  7. Math

    a total of $ 14,000 is invested in two funds paying 4% and 5% annual interest. The combined interest is $620 a)write a system of equations to model this problem b). graph this system and use the graph to estimate how much was invested in each fund?

    asked by LAnae on May 6, 2010
  8. Physics

    A mass of 1.0 kg is located at the end of a very light and rigid rod 44 cm in length. The rod is rotating about an axis at its opposite end with a rotational velocity of 3 rad/s. (a) What is the rotational inertia of the system? kg · m2 (b) What is the

    asked by Jermaine on April 6, 2012
  9. chemistry

    Hi, I've watched a tutor solve a simple dilution solutions problem on video. There's a calculation in that problem I wish you could clarify for me. It goes like this: Approximately what volume of water is needed to dilute 25.0 mL of 18.0 M sulfuric acid to

    asked by Cliff on December 11, 2010
  10. biology

    The mouth, small intestine, and kidneys have functions that involve the a. digestion of food, synthesis of vitamins, and filtering of the blood. b. intake, digestion, absorption, and elimination of food and its wastes. c. secretion of bile, digestion of

    asked by Lily on November 30, 2010
  11. Chemistry

    density- 0.818g/mL boiling point- 78.5 degrees C heat of vaporization- 210cal/g a)How much energy, in calories, will be required to evaporate 125.0 mL of ethanol at its boiling point? b)How long will it take to add this energy, if the rate of heating is

    asked by Dana on September 1, 2009
  12. chemistry

    Your balloon contains 22 grams of Carbon dioxide. Use the following link to determine the temperature in your area. and then use the following to convert to Kelvin. Record below. Given the Gas Constant R please use the ideal gas law to calculate the volume

    asked by amy on June 2, 2012
  13. Math

    Create an addition word problem and a subtraction word problem using fractions. Show how to find the solution to each problem. Once you find the solutions to your problems, rewrite the solutions as either a terminating or nonterminating decimal.

    asked by Christian on October 1, 2012
  14. pre-alg

    I need help to create an addition word problem and a subtraction word problem using fractions. I need to show how to find the solution to each problem. Once I find the solutions to my problems, I have to rewrite the solutions as either a terminating or

    asked by AudioslavedCobain182 on October 16, 2013
  15. math

    Create an addition word problem and a subtraction word problem using fractions. Show how to find the solution to each problem. Once you find the solutions to your problems, rewrite the solutions as either a terminating or nonterminating decimal.

    asked by math help asap on November 7, 2014
  16. chemistry

    Consider the following system, which is at equilibrium, 3C(s) + 3 H2(g) mc020-1.jpg CH4(g) + C2H2(g) The result of removing some C(s) from the system is that a) more CH4(g) and C2H2(g) are produced to replace that which is removed. b) Kc decreases. c) more

    asked by julie on May 11, 2014
  17. chemistry

    following equilibrium system with a Kc of 1.23E-03: C3H6O (aq) + 2C2H6O (aq)--> C7H16O2 (aq) + 2H2O (l) 1.What is the equilibrium expression for this system? 2.If the molar concentrations of C3H6O2 and C2H6O are both 0.255 at equilibrium, what is the

    asked by cateye on April 22, 2012
  18. science

    HELP FAST!!!!!!!!!!!!!!!! If you see that a hot-air balloon is rising above the top of a hill, what is the top of the hill called? A. delta point B. distance system C. coordinate system D. reference point

    asked by LILY on November 29, 2012
  19. Biochemistry

    A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the final number of microstates is 0.503 times that of the initial number of microstates?

    asked by Mi on May 7, 2015
  20. biology

    I got a biology project that's about the excretory system & I have to write the word excretory & draw pictures inside of the word that compares it to real life. What pictures can something be compared that involves with the system?

    asked by Clarissa on February 29, 2016
  21. statistics

    the hospital paper filing system contained 20,890 records. A total of 456 were identified as misfiled. What is the filing accuracy rate for the system? What is the percentage of misfiled records?

    asked by Anonymous on December 7, 2014
  22. algebra help

    2) subtract the two equations to erase the y value (since 2y-2y=0) and solve for x, then add them to erase the x value (since -3x+3x=0) and solve for y. ur x values should be -8.5 and 7.5 respectively. i don't know how to do #1 step by srep the problems 1)

    asked by Me on February 19, 2007
  23. math

    Solve for the indicated variable A=1/2 bh Solve for b 2A = bh, so b = 2A/h ok thanks so on this example C=2pie r Solve for R Would the answer be 2C/pie=r ???? ok thanks so on this example C=2pie r Solve for R Would the answer be 2C/pie=r ???? Divide both

    asked by brittany on August 15, 2006
  24. math

    For questions 4–5, use the following two ways to display the test scores received on Mr. Alexander's math test. Use these displays to solve each problem. Stem | Leaf 6 | 8 9 7 | 0 3 5 8 9 8 | 1 2 2 5 7 8 8 9 9 | 0 2 3 Pie Chart: 80-89= 44.4% 90-99=16.6%

    asked by Kel on March 17, 2015
  25. Work energy

    Question Details Three masses m1= 5.0 kg ; m2= 10.0 kg ; m1= 15.0 kg are attached by a strings over frictionless pulleys. The horizontal surface exerts a force of friction of 30N on m2. If the system is released from rest, use energy concepts to find the

    asked by Harry on November 19, 2006
  26. chemistry

    Ethyl acetoacetate is a liquid. The value of the tautomeric constant for neat ethyl acetoacetate is Kt = .079. What is the percentage of the enol form in neat ethyl acetoacetate? please show all the work thanks!

    asked by howie on August 5, 2007
  27. 5th grade math

    a new fence is needed for the perimeter of a rectangular horse pasture. The pasture measures 78 feet by 68 feet. how many feet of fencing are needed for the pasture? CAN YOU SHOW TO WORK THIS PROBLEM>?

    asked by pat on January 19, 2011
  28. Chemistry

    Glutamic acid is triprotic amino acid with pKa values of 2.23, 4.42, and 9.95. You are given a 0.100 M solution of it in its fully protonated form (H3A). How many moles of KOH must be added to 100 mL of this solution to make a solution with a pH of 5.00. I

    asked by Angelyka on March 2, 2013
  29. chemistry

    A solution is prepared by dissolving 20.2 {\rm mL} of methanol ({\rm{CH}}_3 {\rm{OH}}) in 100.0 {\rm mL} of water at 25 ^\circ {\rm C}. The final volume of the solution is 118 {\rm mL}. The densities of methanol and water at this temperature are 0.782 {\rm

    asked by aa on July 14, 2012
  30. Chemistry

    Let’s assume you have 250 ml of a 1.3M KOH solution and you want to neutralize it with the acid HBr. It takes 350 ml of the HBr solution to do so. What must have been the molarity of the HBr solution? HBr(aq) + KOH(aq) => KBr(aq) + H2O(l) The

    asked by Chris on November 29, 2014
  31. acid-base titrations

    what is it important to keep the NaOH solution covered at all times? How will the molarity of the NaOH solution be affected by its continued exposure to the atmosphere? The pale pink color of the titration solution at the end point will fade to colorless

    asked by natash on April 21, 2008
  32. AP Chem

    A solution of hydrogen peroxide, H2O2, is titrated with a solution of potassium permanganate, KMnO4. It requires 51.7 mL of 0.145 M KMnO4 to titrate 20.0 g of the solution of hydrogen peroxide. What is the mass percentage of H2O2 in the solution? If you

    asked by Anna on November 3, 2008
  33. Chemistry

    If you have 200 ml of a 0.1M solution of acetic acid (pka=4.75), 1. How many ml of a solution of 1.O M NaOH would you need to adjust the pH to 5.2? 2. How many ml of water would you then add to make the solution of 0.05M in total acetic acid (ie., acetic

    asked by Brayden on June 29, 2011
  34. chemistry

    The concentrated H2SO4 of 155g dissolved in enough amount of water if acidic solution is 2.3L a) what is the mole of H2SO4 b) what is the concentration H2SO4 c) what is the concentration of H+(H3O+) created in the solution d) what is the PH value of

    asked by Anonymous on January 12, 2015
  35. Chemistry

    A standard KHP solution is made by dissolving 2.12 grams of KHP in 100.00 mL of water. The KHP solution is then titrated with NaOH solution. It takes 23.12 mL of NaOH to reach the endpoint. What is the concentration of the NaOH?

    asked by Anonymous on March 1, 2015
  36. math

    jen can run at 7.5 m/s and mary at 8.0 m/s. on a race track jen is given a 25 m head start, and the race eds in a tie. how long is the track? let x = distance run by jen. x + 25 = distance run by mary. time jen = d/r = x/7.5 time mary = d/r = (x+25)/8

    asked by joseph on November 28, 2006
  37. 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
  38. Physics

    a track is mounted on a large wheel that is free to turn with negligible friction about a vertical axis. a toy train of mass m is placed on the track and, with the system initially at rest, the electrical power is turned on. the train reaches a steady

    asked by Sarah on February 13, 2008
  39. CHEM

    Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O. a)What is the molarity of the stock solution of luminol? answer I got: molarity of

    asked by K on October 18, 2007
  40. CHEM

    Help on part "c": The forensic technician at a crime scene has just prepared a luminol stock solution by adding 19.0g of luminol into a total volume of 75.0mL of H2O. a)What is the molarity of the stock solution of luminol? anwer I got: molarity of luminol

    asked by K on October 18, 2007
  41. Math

    Solve the equation: 4x^2 + 100 = 0 Here is my work: 4x^2 + 100 = 0 - 100 - 100 4x^2 =0 /4 /4 x = -5 or 5. Did I do this correctly?

    asked by Bob on February 10, 2013
  42. Chemistry

    A 94 mL vanillin solution with a concentration of 0.017 mol L-1 was made by extraction from 24.41 g of vanilla pods. Calculate the percentage of vanillin in the vanilla pods. It would be helpful if you could explain to me the process to work out this

    asked by Jessica on May 10, 2015
  43. Chemistry

    A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 10-1 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 10-1 M

    asked by Joe on June 30, 2014
  44. Chemistry

    A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 10-1 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 10-1 M

    asked by Joe on June 30, 2014
  45. Biology

    How can NaHCO3 function as both the acidic component of the NaHCO3/Na2CO3 buffer system and as the basic compnent of the H2CO3/NaHCO3 buffer system?

    asked by Jim on October 1, 2012
  46. chemistry

    URGENT!! You wish to prepare 1 L of a 0.02 M potassium iodate solution. You require that the final concentration be within 1% of 0.02 M and that the concentration must be known accurately to the fourth decimal place. How would you prepare this solution?

    asked by Martin on October 11, 2010
  47. Physical Chemistry

    A total charge of 97.4 kC passes through an electrolytic cell. Determine the quantity of substance produced in each of the following cases. (a) the mass (in grams) of silver metal from a silver nitrate solution ?g (b) the volume (in liters at 273 K and

    asked by Mark on March 29, 2010
  48. Science

    This has already been posted, however the provided answer does not make sense. Anyone have additional insight for this one? An excess of aluminum metal is added to 200.0 mL of 0.025 M solution of CuCl2, reducing the Cu+2 ions to metallic Cu. If the

    asked by Chem Help on January 4, 2016
  49. Math

    Please show me how to set this up and how to solve. Thanks in advance. At the local ballpark, the team charges $5 for each ticket and expects to make $1,300 in the concessions. The team must pay its players $1800 and pay all other workers $1500. Each fan

    asked by Mary on February 4, 2012
  50. math

    The ratio of the tens digit to the units digit is 1:4. If the digits are reversed, the sum of the new number and the original number is 110. Find the original number by using a systems of equations with elimination

    asked by misa on September 11, 2008
  51. Algebra

    For the fundraiser, will sold 225 candy bars.he earns $1 for each almond candy bar he sells and $0.75, how many of each type of candy bar did he sell for the fundraiser? solving systems using elimination

    asked by Candy on January 30, 2013
  52. Algebra

    How do you work square root problems when there is a number outside the radical that needs to be divided out. Example: 2(square root of 5x-1)=3(square root of 2x+4). How can you get both of the radicals by themselves in order to solve the equation?

    asked by Catey on March 31, 2008
  53. Math

    The measure of (Angle) A is 4 degrees greater than the measure of (Angle) B. The two angles are complementary. Find the measure of each angle. (I tried 41+45 but that didn't work out, anyone got any steps to solve this?)

    asked by Katelyn on November 13, 2017
  54. Physics

    A solid disk of mass m1 = 9.4 kg and radius R = 0.25 m is rotating with a constant angular velocity of ω = 36 rad/s. A thin rectangular rod with mass m2 = 3.1 kg and length L = 2R = 0.5 m begins at rest above the disk and is dropped on the disk where it

    asked by MUHAMMAD JUNAID on April 21, 2019
  55. physics

    In the figure below, m1 = 10.0 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60, and the coefficient of kinetic friction is 0.30. m1 is on a table connected to m2 by a string that is on a pulley. m2 is

    asked by Dan on September 28, 2011
  56. Administration

    The local school system asks you to submit a proposa to do pre-employment physicals for sixty bus drivers. Wha financialor accounting inrmation do you need to submit a proposal? What will you charge the school bus system?

    asked by Laura on February 7, 2011
  57. chem

    a buffer is made by adding 150 ml of .595M BaF2 and 0f .500M of HF solution. calculate the pH of this buffer system calculate the pH of this buffer after adding .100 mol Hcl calculate the pH of this buffer after adding .0750 mol Ca(OH)2 ka(HF)= 6.9x10^-4

    asked by simi on March 1, 2010
  58. calculus

    find the volume of solid inside the paraboloid z=9-x^2-y^2, outside the cylinder x^2+y^2=4 and above the xy-plane 1) solve using double integration of rectangular coordinate. 2) solve using double integration of polar coordinate 3)solve using triple

    asked by AIRA on May 10, 2014
  59. Physics (please help)

    Two sinusoidal waves travel in the same direction and have the same frequency. Their amplitudes are Y1 and Y2. The smallest possible amplitude of the resultant wave is: a) Y1 + Y2 and occurs if they are 180 degrees out of phase b)[Y1 - Y2] and occurs if

    asked by susan on February 13, 2007
  60. chemistry help

    Nitric acid,HNO3, is available ata a concentration of 16 M. how much would react with 5.58 g of KOH acording to the following equation? HNO3+KOH-H2O+KNO3 dont understand? does not give me a volume amount to work with and I really don't understand how to

    asked by nicole on November 21, 2010
  61. psychology

    For each of the following questions, choose either authority, rational method or empirical method as the best way to answer the question, and explain how you would do it. Then consider whether any alternative methods might be used. is your course

    asked by kel on January 12, 2012
  62. math

    Fair Race Portfolio Template: Functions Instructions: Follow the instructions provided in the lesson. Use this template to record your work and answers. Please submit this template to the dropbox along with any other evidence you would like to provide for

    asked by help on February 17, 2017
  63. English

    Hi for my english class, we have to make an invention using cheap material that is useful, original, and provides a solution to a problem. We actually have to show the class like a prototype of it and I have no idea what to do! Mines on tuesday and I'm so

    asked by John on December 5, 2010
  64. aed

    • Review the methods for monitoring student progress presented in Ch. 6 (pp. 187–191) of the text. Each method presents a monitoring strategy for a particular type of activity or situation in a classroom, such as learning centers or independent work.

    asked by scooby on April 23, 2010
  65. Algebra 2

    Two cards are drawn at the same time from a 52-card deck. Dind the probability of each event. a) both cards are jacks b) both cards are sixes c) eith both cards are jacks or both cards are sixes PLEASE SHOW ALL WORK!

    asked by Trisan on December 9, 2009
  66. chemistry

    A student measures 0.2452 g of a monoprotic solid acid, and dissolves the solid in water to make 100.0 mL of solution. the entire solution is titrated to a phenolphthalein endpoint with 45.06mL of 0.1725M KOH. A. what is the molarity of the acid solution?

    asked by ali on November 9, 2011
  67. Chemistry

    In a previous experiment, 0.800 g of the green complex iron salt was placed in an Erlenmeyer flask and heated with concentrated sulfuric acid until all oxalate ion was destroyed (CO2, SO2 and H2O are formed). Ferric ion (Fe3+) remained in solution and was

    asked by Linda on May 7, 2007
  68. Chemistry

    If you dilute 12.5 mL of a 3.5 M solution to make 213.8 mL of solution, what is the molarity of the dilute solution?

    asked by Dylan on March 27, 2013
  69. Chemistry

    If you dilute 11.6 mL of a 3.5 M solution to make 214.8 mL of solution, what is the molarity of the dilute solution?

    asked by Grace Badaki on March 12, 2014
  70. chemistry

    A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked by katie on January 22, 2012
  71. Chem - Acid & Bases

    Please help with the solution: Question asks: A solution has [OH-] = 2.0 X 10 negative ^14. The [H-] in this solution is 2.0 x 10 negative ^14. Thank you for your help. Appreciated.

    asked by Cassandra on April 23, 2015
  72. math

    How many gallons of a 12% indicator solution must be mixed with a 20% indicator solution to get 10 gal of a 14% solution?

    asked by James on February 22, 2009
  73. Chemistry

    A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked by Homework help on October 19, 2013
  74. Chemistry

    A solution of NaOH(aq) contains 5.4 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked by Anonymous on October 28, 2016
  75. Algebra 2

    Joan has 40 liters of a 25% solution. How many liters of a 60% solution should she add to make a 30% solution?

    asked by Trisan on October 18, 2009
  76. chemistry

    A solution of NaOH(aq) contains 6.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked by katie on January 22, 2012
  77. Chemistry

    A solution of NaOH(aq) contains 5.2 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.

    asked by Homework help on October 19, 2013
  78. Physics

    An airplane is travelling from Vancouver to Toronto following the jet stream. The plane cruised at an average speed of 1100 km/h for the 4000 km flight. How long did the flight take? If the plane left Vancouver at 3:00 am EST, what time did it arrive in

    asked by GG on February 14, 2015
  79. science

    For each of the activities listed below: 1. Describe one way in which work is done (Reminder: For work to be done, the force and the distance must be in the same direction.). 2. List two simple machines used in each task. 1. making a meal oven, microwave

    asked by anonymous on November 4, 2009
  80. Calculus rate of change

    Can you please check my answers and fix the ones if any that are wrong. Along with help on part d Consider the following fun f(x)=(3/4)x^3- x^3-3x^2+6x A.find relative extrema and identify max and min. I got x=1 max ,±√2 min B.determine the interval(s)

    asked by Nicole on July 18, 2016
  81. Chemistry

    Hello everybody, I'm told that potassium permanganate is dissolved in an aqueous buffer of ammonia and ammonium at equal concentrations (1M), and treated with 1M sodium hypochlorite, the permanganate ion is reduced to insoluble manganese dioxide as the

    asked by John Peterson on July 18, 2007
  82. physics

    1. how much work do you do on a 25-kg backpack when you walk a horizontal distance of 100 m? -I got 2,500 J 4. if you friend pushes a lawnmower four times as far as you do while exerting only half the force, which one of you does more work? how much more?

    asked by Donna on October 17, 2007
  83. Chemistry

    A solution of calcium nitrate, Ca(NO3)2, reacts with a solution of ammonium fluoride, NH4F, to form solid calcium fluoride, CaF2, and ammonium nitrate, NH4NO3(aq). When 45.00 mL of 4.8724 x 10-1 M Ca(NO3)2 solution was added to 60.00 mL of 9.9981 x 10-1 M

    asked by Joe on June 30, 2014
  84. calc

    What are the intercepting points of y^2=-4x and x^2=y I set both equations equal to 0, but only get x=0 and there is another intercepting point. please help! You can solve for one of the equation and substitute it into the other equation. In this case you

    asked by nick on December 7, 2006
  85. algebra

    Nurse erika needs to prepare 12 liters of a 10% saline solution. The stockroom only has 7 % and 15% saline solutions. How much of each solution should erika mix together to get 12 litres of a 10% saline solution

    asked by sh on October 21, 2012
  86. chemistry

    In a titration experiment, 22.00mL of a NaOH solution are required to neutralize 24.02 mL of a 0.1094 M HCL solution. what is the molarity of H+ in the HCL solution? (same as the molarity of HCL)

    asked by sari on November 9, 2011
  87. Chemistry

    A solution of ethanol (C2H5OH) in water is prepared by dissolving 76.9 mL of ethanol (density 0.79 g/cm^3) in enough water to make .250 L of solution. What is the molarity of ethanol in this solution?

    asked by Anonymous on May 6, 2010
  88. algebra

    Nurse erika needs to prepare 12 liters of a 10% saline solution. The stockroom only has 7 % and 15% saline solutions. How much of each solution should erika mix together to get 12 litres of a 10% saline solution

    asked by sh on October 21, 2012
  89. environmental science

    what makes the the water of the aquatic system more basic? maybe the pollution? Maybe. What aquatic system are you talking about? See http://www.tceq.state.tx.us/cgi-bin/compliance/monops/daily_info?parameter:10400 for further discussion of what can make

    asked by dorie on January 1, 2007
  90. Science

    The largest planets in the solar system are a) located between Earth and Jupiter b)found between Mars and Pluto c) located between the sun and the earth d) scattered througthout the solar system e) none of these e

    asked by babe on August 16, 2010
  91. Chemistry

    Question: A solution of H2X of unknown concentration is given. pH of the solution is 4. ka1=2*(10)^-6 M ka2=1*(10)^-11 M Find the concentrations of [H2X] ,[HX-] and X^2- in the solution. My thoughts on the question: The temperature which the solution is

    asked by Shenaya on May 31, 2017
  92. algebra

    hi... i need help finding 2 equations that i would use for this elimination process.... this is what they gave me: * the sum of the digits i a two-digit is 14. If the 2 digits are reversed, the new number is 18 less than the original number. Find the

    asked by ana on January 6, 2008
  93. algebra..urgent...

    hi... i need help finding 2 equations that i would use for this elimination process.... this is what they gave me: * the sum of the digits i a two-digit is 14. If the 2 digits are reversed, the new number is 18 less than the original number. Find the

    asked by ana on January 6, 2008
  94. ORGANIC CHEMISTRY

    WHICH ONE OF THE FOLLOWING ALKYL HALIDES GIVES THE HIGHEST RATIO OF SUBSTITUTION TO ELIMINATION ON TREATMENT WITH SODUM ETHOXIDE IN ETHANOL 1-BROMOPENTANE 2-BROMOPENTANE 3-BROMOPENTANE 1-BROMO-2-METHYLBUTANE 2-BROMO-2-METHYLBUTANE

    asked by Jake on July 27, 2008
  95. Geometry

    Okay, this is a problem that I've tried over ten times before getting a fresh problem and trying that one too. I've never gotten a correct answer and I can't figure out why it's not right. Here's the problem, "Find the distance between each pair of

    asked by Aubry on September 21, 2006
  96. Chemistry

    1. Imagine you have a saturated solution of Ca(OH)2, at equilibrium, that has some undissolved Ca(OH)2 precipitated on the bottom of the test tube. If you add an additional scoop of Ca(OH)2 to the solution will concentration of [OH-] in the solution

    asked by Caroline on March 16, 2015
  97. Sentences and Paragraph 2

    Your favorite cousin has moved to your town and is looking for a job. Her previous experiences are working as a cashier and sales clerk at two department stores. You know she plans to apply at similar stores in your town. But you also know she is a perfect

    asked by Diana on September 7, 2013
  98. Finite Math

    I keep trying to set up this problem to solve it using the Simplex Method, but I can't seem to get the tableau set up correctly. If anyone could help, I would appreciate it: A baker has 150 units of flour, 90 of sugar, and 150 of raisins. A loaf of raisin

    asked by Christina on December 9, 2010
  99. Dynamics

    A stone has an initial velocity of 100 fps up to the right at 30 degrees with the horizontal. The components of the acceleration are constant at ax=-4 fps^2 and ay=-20 fps^2. Compute the horizontal distance covered until the stone reaches the point 60 ft

    asked by Carl on July 14, 2018
  100. Science

    Hormones and Homeostasis 1) The human endocrine system is made up of which of the following structures? :Vessels. :Receptors. :Glands.*** :Chambers. 2. Which of the following best describes the function of the endocrine system? :It secretes chemical

    asked by TheLOUDEST_0430 on February 27, 2015

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