1. Chemisty

    Someone please tell me if I'm doing this right... It's due tonight!! Dr. Bob222, Yesterday I posted a question and you answered me with how to calculate it.. Can you tell me if I'm doing this correctly?? Please! Consider the following chemical equation:

    asked by Jennie on February 25, 2015
  2. (Math) PLZ CHECK ANSWERS

    1. Which number is a solution of the inequality? 10.68 A)-5 B)-6 C)6 D)7*** 3. Which number is a solution of the inequality? 6>z(10-z) A)0 B)1 C)2 D)3*** 4. What are all the subsets of the set? {-1,9} A) 0, {-1}, {9}*** B) {-1}, {9}, {-1, 9} C) 0, {-1},

    asked by Katrina on October 28, 2016
  3. math

    Ok, so when you are solving an equation, and you have an answer such as 5x=0 , does that mean that it is no solution or all real #s? And, when the answer is 4=4 , does that mean it is no solution or all real #s? And when the answer is 2x=2x, does that mean

    asked by K on May 7, 2013
  4. Chemistry

    Ammonium sulfate reacts with a solution of sodium hydroxide to produce sodium sulfate, ammonia gas and water. Calculate the yield in grams of ammonia gas that would form; and the amount of excess reagent in grams that would be left in the flask, after 9.92

    asked by John on April 17, 2011
  5. Buffer solution

    Solve an equilibrium problem (using an ICE table) to calculate the pH. a solution that is 0.205 M in CH3NH2 and 0.110 M in CH3NH3Br. i used th Ka of CH3NH2 and set up the problem as Ka=[H3O][CH3NH2]/[CH3NH3Br], but that was wrong. So i switched the

    asked by Kyle on March 27, 2010
  6. maths

    Chris wants to put a concrete path and a fence around his rectangular garden. The concrete path will be 1 meter wide and the fence will go around the edge of the path.The garden itself measures 5 meters by 8 meters. A)calculate the perimeter of the fence

    asked by Anonymous on February 24, 2011
  7. physics

    A motor car of mass 1200kg is moving along a straight line with a uniform velocity of 90km/h.itsmvelocity is slowed down to 18km/h in 4 s by an unbalanced external force.calculate th acceleration and change in momentum of the car . Also calculate the

    asked by piyush on October 15, 2015
  8. Chemistry

    The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm . The reaction occurs in a 1.29-cm sample cell, and the only colored species in the reaction has an extinction coefficient of 5700

    asked by Leslie on January 26, 2013
  9. Chemistry

    The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm . The reaction occurs in a 1.29-cm sample cell, and the only colored species in the reaction has an extinction coefficient of 5700

    asked by Leslie on January 26, 2013
  10. chemistry

    A sample of fresh grapefruit juice was filtered and titrated with the I2 solution prepared in Part 2. A 100.0 mL sample of the juice took 9.85 mL of the iodine solution to reach the starch end point. What is the concentration of Vitamin C in 100ml juice?

    asked by saddee on April 28, 2009
  11. physics

    Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

    asked by Jezrell on July 3, 2012
  12. Physics

    Please answer asap with complete solution thanks a lot. I need the solution to answer other questions much alike to this one. :) Two electrons are 10^-15 meters apart. One electron is fixed on its position. The other, originally at rest, is released. How

    asked by Jezrell on July 3, 2012
  13. Chemistry

    Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to Ca10(PO4)6(OH)2(s) --> 10Ca2+(aq) + 6PO43-(aq) + 2OH-(aq) Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the

    asked by Angelyka on January 24, 2013
  14. quantitative chemistry

    Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

    asked by Jackie on March 22, 2013
  15. chemistry

    Consider a solution made by mixing 500.0 mL of 0.04182 M Na2HAsO4 with 500.0 mL of 0.03645 M NaOH. Complete the mass balance expressions below for Na and arsenate species in the final solution. There are 4 arsenate species, but I only got three of them. I

    asked by Jackie on March 23, 2013
  16. Chem Check Please!!!

    Boric acid, H3 BO3, is a triprotic acid that dissociates in three reactions. The first dissociation step is: H3BO3 ⇌ H+ + H2BO3, Ka1 = 7.3 x 1010; the second dissociation step is: H2BO3 ⇌ H+ + HBO32, Ka2 = 1.8 x 1013; and the third dissociation step

    asked by Mello on February 21, 2014
  17. Chemistry

    A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

    asked by Sumaiyah on June 20, 2013
  18. Chemistry

    A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

    asked by Sumaiyah on June 20, 2013
  19. Chemistry

    A saturated solution of barium chloride at 30 degrees celcius contains 150g of water. How much additional barium chloride can be dissolved by heating this solution by heating this solution to 60 degrees. Solubility of Bacl @ 30 degrees=38.2g/100g water

    asked by Sumaiyah on June 20, 2013
  20. chemistry

    Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third? 1) What is the pH of a 0.05 M solution of TRIS acid (pka =

    asked by alan on February 2, 2008
  21. chemistry lab

    Here are 2 questions I worked out, but need them checked. Also, can't get answer to another question correct unless question 1 is correct. Would you check the first 2 and help me with the third? 1) What is the pH of a 0.05 M solution of TRIS acid (pka =

    asked by ryan on February 2, 2008
  22. chemistry

    a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

    asked by yeng on January 6, 2015
  23. colligative properties

    a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

    asked by yeng on January 7, 2015
  24. chemistry

    a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

    asked by yeng on January 6, 2015
  25. college chemistry

    a solution of CH4N2O in water has a vapor pressure of 19.6 torr. at 25C. what is the mole fraction of CH4N2O in this solution? HELP ME WATER PURE PRESSURE (P0) IS 23.8 TORR VAPOR PRESSURE IS 19.6 TORR DONT KNOW HOW TO SOLVE IT ? P(SOLUTION)= X (CH4N2O)

    asked by yeng on January 6, 2015
  26. Chem

    A 1.00-mole sample of ammonia at 13.0 bar and 20°C in a cylinder fitted with a movable piston expands against a constant external pressure of 1.00 bar. At equilibrium, the pressure and volume of the gas are 1.00 bar and 22.0 L, respectively. a) calculate

    asked by Alina on January 25, 2011
  27. physics

    a 62.0kg bungee jumper jumps from a bridge. she is tied to a bungee cord whose unstretched length is 12.0 m and falls a total of 31m a) calculate the spring constant k of the bungee cord and b) calculate the maximum acceleration she experiences.

    asked by kristen on August 10, 2014
  28. physics

    a 62.0kg bungee jumper jumps from a bridge. she is tied to a bungee cord whose unstretched length is 12.0 m and falls a total of 31m a) calculate the spring constant k of the bungee cord and b) calculate the maximum acceleration she experiences.

    asked by kristen on August 9, 2014
  29. physics

    1000 cm3 of air at 20 temperature and 101.35 kpa is heated at constant pressure until its volume doubles. a, use the ideal gas equation to calculate the final temperature of the gas. b, calculate work done by the gas as it expands.

    asked by Meskelu on November 4, 2018
  30. Math

    1. Tell whether the system has one solution infinitely many solutions or no solution. 6y=-5x+24 2.5x+3y=12 a. one solution b. infinitely many solutions*** c. no solution 2. Tell whether the system has one solution infinitely many solutions or no solution.

    asked by Kaai97 on January 11, 2016
  31. Organic Chem I Lab

    I had to react 1-propanol with NaBr and H2SO4. I refluxed for one hour and when attempting to separate out the product (product was supposed to be 1-bromopropane) via sep funnel either could no longer distinguish between the organis layer and the aqueous

    asked by Meredith on November 30, 2010
  32. math

    A solution of alcohol and water is a% alcohol where a = 40. The solution is found to contain 32 milliliters of alcohol. How many milliliters total (both alcohol and water) are in the solution?

    asked by Sabre on November 8, 2010
  33. Scenario Question?

    Dan is an employee at a regional mid-size computer company that has recently been sold to a larger, national computer manufacturing corporation. Dan is in charge of computer production orders, and because of this recent shift in ownership, his

    asked by Ree on May 27, 2008
  34. CHEMISTRY

    If you use a dirty buret, the titrant leaves drops of solution behind as the meniscus descends during delivery of the solution. The volume actually delivered by the buret will be __________ the volume your readings of the buret scale indicate was delivered

    asked by Anonymous on October 7, 2014
  35. Chemistry

    The heat of solution of ammonium chloride is 15.2 kJ/mol. If a 6.187 g sample of NH4Cl is added to 65.0 mL of water in a calorimeter at 26.5°C, what is the minimum temperature reached by the solution? [specific heat of water = 4.18 J/g°C; heat capacity

    asked by Chris on May 5, 2014
  36. math

    a 9 percent salt water solution is mixed with 4 oz. of an 18 percent salt water solution in order to obtain a 15 percent salt water solution. how much of the first should be used?

    asked by Bob on September 2, 2010
  37. science

    a student adds 3 spoons of salt to 100 ml of water. the solution is clear, with nothing on the bottom of the cup. one spoon of the slat ha a mass of 5g. what is the mass of the solution? after the water evaporates, what is the mass of the solid remaining

    asked by linda on September 24, 2015
  38. Chem

    A 20.00−mL sample of an unknown HClO 4 solution requires titration with 22.92mL of 0.2200M NaOH to reach the equivalence point. What is the concentration of the unknown HClO 4 solution? The neutralization reaction is: HClO 4 (aq)+NaOH(aq)¨H 2

    asked by Anonymous on August 5, 2013
  39. algebra

    Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value

    asked by Pool on May 2, 2013
  40. chemistry

    A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55 °C. The vapor pressure of pure water at 55 °C is 118.0 torr. The MW of lactose is 342.3 g/mol. What is the partial pressure of water above the solution?

    asked by Anonymous on November 7, 2011
  41. MAths

    Consider the following system of inequalities: (c−1)x^2+2cx+c+4≤0 ---- (1) cx^2+2(c+1)x+(c+1)≥0 ---- (2) The sum of all real values of c, such that the system has a unique solution, can be written as a/b, where a and b are coprime positive integers.

    asked by ianian on April 29, 2013
  42. maths

    Consider the following system of inequalities: {(c−1)x^2+2cx+c+4≤0 cx^2+2(c+1)x+(c+1)≥0 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value

    asked by sara on May 3, 2013
  43. algebra

    Consider the following system of inequalities: {(c-1)x^2+2cx+c+40 The sum of all real values of c, such that the system has a unique solution, can be written as ab, where a and b are coprime positive integers. What is the value of a+b? Details and

    asked by hmmm on April 29, 2013
  44. Chemistry

    1. Calculate the number of molecules in a deep breath of air whose volume is 2.15 L at body temperature, 36 degrees Celsius, and a pressure of 740 torr. 2.A fixed quantity of gas at 24 degrees Celsius exhibits a pressure of 740 torr and occupies a volume

    asked by Emory on November 2, 2009
  45. linear algebra

    If A is a nonsingular matrix, what is the null space of A? If A is nonsingular then the equation: A x = y has a unique solution. Now, the equation: A x = 0 always has a solution: x = 0. If A is nonsingular, then this must thus be the only solution. This

    asked by chris on July 11, 2007
  46. chemistry

    I need a formula for: 0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. next 0.5 grams of sodium chloride is dissolved to make 0.05 ml of solution. next 670 grams of Pb (C2H3O2)4 are dissolved to make 3.5 ml of solution.

    asked by venita on May 19, 2011
  47. College Chemistry

    You have combined 1.218 moles of calcium ions and 0.943 moles of lithium ions in enough solvent to make 500.00mL of solution. What is the mole fraction of lithium ions in this solution? What type of problem is this and how do I set it up to solve?

    asked by Jacob on June 5, 2017
  48. chemistry (buffer)

    If 5.00 mL of 1.60 nitric acid is added to a solution of 2.00 mmol thiocyanic acid (HSCN pKa=4.00) and 4.500 mmol calcium thiocyanide, assume a soluble salt- what is the pOG of the resultant complex solution (of total volume .350L). I worked the problem

    asked by rani on May 2, 2013
  49. Chemistry

    In a constant-pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2 was added to 60.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 21.71 °C to 26.21 °C. If the solution has the same density and specific heat as water,

    asked by Heather on February 10, 2012
  50. Grammar

    Circle the nouns that can be used with the verbs on the right . Engine-consumption-dependence (reduce) Solution-dependence-alternative (find) Resources-technology-stocks(deplete) Quantity-problems-question(solve) Energy-crisis-shortage (face)

    asked by Maryam on June 3, 2013
  51. Science

    One troy ounce of gold is worth $380. There are 33.8 grams per troy ounce. You have a stock colloidal solution of a very fine gold dust. Its concentration is .1% w/v. from this solution, 1 ml is placed in 9 ml of an isotonic, pH buffered solution to make a

    asked by Baylee on March 22, 2015
  52. Chemistry

    A chemist dissolves 0.096 g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 10.8-mL sample of this solution is then transferred to a second 500-mL volumetric flask and diluted. What is the molarity of CuSO4

    asked by Eva on March 29, 2016
  53. Chemistry

    A chemist dissolves 0.096 g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 10.8-mL sample of this solution is then transferred to a second 500-mL volumetric flask and diluted. What is the molarity of CuSO4

    asked by Eva on March 29, 2016
  54. math

    1,5,11,19 (a) calculate next two patterns (b) calculate the nth term of the pattern (c)which term of the pattern is equal to 2549. thanks a lot

    asked by help on June 3, 2015
  55. AP CHEM

    Please help me with these AP Chemistry homework problems and show me the steps how to find the solutions: Liquid-Liquid Tirations: What is the concentration of the unkown solution for each of the following titrations? #5) 25.36 mL of 0.178 M NaOH is

    asked by shylo on July 31, 2008
  56. Chemistry

    A solution is prepared by dissolving 0.1 mol of ethanoic acid (CH3COOH) in 500ml of water at 25 C. pKa of ethanoic acid is 4.7. What is the pH of the solution? I'm assuming the equation is pH = pKa + log[Base]/[Acid] but can't get it to work?

    asked by Becca on October 21, 2015
  57. 1CHEM

    In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons

    asked by Anonymous on November 3, 2015
  58. Math

    For problems 1 and 2, determine how many solutions there are for each triangle. You do not have to solve the triangle. 1. A = 29°, a = 13, c = 27 2. A = 100.1°, a = 20, b = 11 For problems 3-6, solve each triangle using the Law of Sines. If there is no

    asked by Tabitha on January 13, 2011
  59. chemistry

    a cell is constructed by immersing a strip of silver in .10 M AgNO3 solution and a strip of lead in 1.0 M Pb(NO3)2 solution. A wire and salt bridge complete the cell. What is the potential of the silver electrode in the cell?

    asked by audrey on December 9, 2010
  60. Chemistry

    Can somebody help me with this question? Zinc metal is placed in a solution of copper ions and undergoes an oxidation-reduction reaction. Which direction is the spontaneous reaction? Zn metal goes into solution. Cu(II) ions come out. Zn + Cu+2 ==> Zn+2 +

    asked by Lisa on February 10, 2007
  61. Chemistry

    In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons

    asked by Anonymous on November 3, 2015
  62. algebra final, please help

    Solve (x+17)(x-20)(x+8)>0 The solution set is (x )? Use at least one inequality or compound inequality to express your answer. For answers with more than one inequality, separate the inequalities by a comma or the word 'or'. Type R is the answer is all

    asked by Becky on March 21, 2008
  63. Algebra/Precalculus

    Solve the system of linear equations and check any solutions algebraically. (If there is no solution, enter NO SOLUTION. If the system is dependent, express x, y, and z in terms of the parameter a.) 3x-3y+6z=6 x+2y-z=8 5x-8y+13z=4 I don't know what

    asked by Dede on April 5, 2017
  64. Chemistry

    In a titration of 35 mL of 0.40 M H3PO4 with 0.30 M KOH solution, what volume (in mL) of KOH solution is needed to reach the last equivalence point (i.e., point in the titration where enough KOH has been added to neutralize all three of the acidic protons

    asked by Anonymous on November 3, 2015
  65. chemistry

    I know the formula is Ma x Mla / 1000 x Sa / Sb = Mb x Mlb / 1000 if 175 ml of KOH of unknown concentration with a methyl red indicator present is titrated with [0.275 M] H3PO4, the yellow solution turns red after 29.6 ml of the H3PO4 is added. What is the

    asked by casey on September 4, 2008
  66. Chemistry-confused

    All alkalis produce hydroxide ions when dissolved in water. How do we write the chemical equation for aqueous ammonia? I see some textbooks write it as ammonia gas dissolving in water to form ammonium ions and hydroxide ions. NH3(g)+ H2O(l) ==> NH4+(aq) +

    asked by janice on April 10, 2009
  67. algebra1/McDougal Littell

    Is the given number a solution of the equation or the inequality? 4y-7=3y-4;3 equation I think it is the inequality. Try substituting 3 for y and see what you get. 4*3-7=3*3-4 or 12-7=9-4 Is this a valid equality? Alternative solution: solve for y

    asked by tonya on September 14, 2006
  68. chemistry

    Lead pipes were once used to transport drinking water and are still found in some older homes and city water systems. Suppose the lead concentration and pH of the water determined by lead (II) hydroxide (Ksp = 2.8x10^-16) dissolving to produce a saturated

    asked by abbey on March 25, 2011
  69. chemistry.

    A student was asked to make some copper(II) sulfate-5-5 (CuSO4.5(H2O) BY reacting copper(II) oxide (CuO) with sulfuric acid. a) Calculate the molar mass of the copper (II) sulfate-5-water which is (64+32+64) + (10+80)=250 mol b)Calculate the amount (in

    asked by Denmark on October 24, 2009
  70. maths

    a cylindrical cake with radius 12cm and height 10cm has a slice cut out. The shape of the top of the slice is a sector of the circle that forms the top of the cake. a) Calculate the area on top of the slice that has been cut out. b) Calculate the volume of

    asked by nabiha on April 22, 2010
  71. physics

    A tennis player moves back and forth along the baseline while waiting for her opponent to serve, producing the position-versus-time graph shown in the figure. (The vertical axis is marked in increments of 1 m and the horizontal axis is marked in increments

    asked by Anonymous on October 3, 2012
  72. physics torque and shelf

    When a wood shelf of mass 6.1 kg is fastened inside a slot in a vertical support, the support exerts a torque on the shelf. The board is 32cm wide by 3cm tall. the slot is 2 cm wide (3cm tall)on the lefthand side. So there are three vertical forces. A)

    asked by kelsi on May 22, 2009
  73. Chemistry

    I'm trying to write an equation for the reaction of zinc nitrate with aqueous ammonia. I know that zinc hyroxide is produced first but I don't really know how to write an equation for this. This is what I came up with: Zn(NO3)2 + 2OH- --> Zn(OH)2 + 2NO3-

    asked by Alice on March 1, 2010
  74. chem

    A solution of Acetic acid has a light red color in the presense of the indicator orange IV. When sodium acetate is added to the solution, the color changes to yellow. Explain the reaction which causes the color change. I have no idea. Does it have to do

    asked by Joyce on April 29, 2009
  75. chemistry

    oxalic acid, h2c2o4, is a weak acid capable of providing two H3O+ ions. ka=.059 k2=6.4E-5 the [h3o]+ in a .38 M solution of h2c2o4 is .12M and can be calculated by the first ionization step only. what is the equilibrium concentration of the oxalate ion

    asked by anonymous on December 4, 2010
  76. chemistry

    Vinegar is a solution of acetic acid, a weak acid. How can you produce more acetate ions in the solution? CH 'subtext' 3 COOH(aq) H+(aq) + CH 'subtext' 3 COO^- (aq) A. Evaporate some of the water. B. Decrease the pressure. C. Increase the volume of the

    asked by emma on September 10, 2016
  77. math

    a college lab paced two orders with a chemical supplier. the first order was for 13 bottles of calcium hydroxide solution and 4 bottles of sulfuric acid and totalled $ 487. the second order was for 6 bottles of calcium hydroxide solution and 2 bottles of

    asked by patel on October 20, 2011
  78. math

    a college lab paced two orders with a chemical supplier. the first order was for 13 bottles of calcium hydroxide solution and 4 bottles of sulfuric acid and totalled $ 487. the second order was for 6 bottles of calcium hydroxide solution and 2 bottles of

    asked by patel on October 20, 2011
  79. Grade 12 Advanced Functions

    One zero of f(x)=x^3+4x^2+x+c is -3. a) calculate the value of c. b)calculate the other zeros.

    asked by Rebecca on October 13, 2011
  80. Chemistry

    Calculate the H+ for number #2 #2 : H+ = 10^-2, with a pH of 2 Not sure how to calculate H+

    asked by Clare on April 29, 2015
  81. Physics

    (a) Suppose that on the moon an astronaut hit a golf ball so that it left his club at a speed of 45ms-1, at an angle of 20degrees to the horizontal. calculate the time of flight of the ball. (b) calculate the horizontal distance travelled by the ball

    asked by Adam on October 28, 2012
  82. finance

    8. Calculate the return on investment in dollars and as a percentage for an investment that you purchase for $500 and sell for $600. (2.0 points) TIP: If you don't remember how to calculate return on investment, review the Calculating ROI pages in Section

    asked by RedHeadedStepChild on March 8, 2016
  83. Atomic physics

    1)What is the longest wavelength light capable of ionizing a hydrogen atom in the n = 6 state 2)a. Calculate the energy of the electron in the ground state of single ionized helium, which has an atomic number Z = 2. b. Calculate the radius of its

    asked by Sandhya on April 13, 2008
  84. Chem.

    To standardize a solution of NaOH, one uses a primary standard called potassium hydrogen phthalate (KHP). It is a monoprotic acid. It has a molar mass of 204.33g/mol. Suppose you weigh out .556g of KHP and dissolve it in water. It requires 14.48 mL of NaOH

    asked by Anonymous! on March 17, 2014
  85. Chemistry

    A strip of zinc metal was placed in a beaker that contained 120mL of a solution of copper(2) nitrate, Cu(NO3)2(aq). The mass of the copper produced was 0.813g. Find the initial concentration of the solution of copper(2)nitrate. Can u help me out with

    asked by Kristien on March 5, 2013
  86. chemistry

    A 0.15M solution of weak triprotic acid is adjusted (base added) so that the pH is 9.27(you can assume minimal volume change). The triprotic acid(H3A) has the following acid ionization constants: Kal=1.0*e-3, ka2=1*e-8,ka3=1*e-12. which species given below

    asked by vivanh on May 13, 2011
  87. English

    How should a country treat the naturalized citizens and the resident aliens from an enemy during wartime? Decide what your opinion is and then write a solution statement. Gather evidence you can use to support your opinion. You should have at least two

    asked by Help please!!!!!! on September 23, 2017
  88. chemistry

    Please check this for me..thank You have a 4.0 L steel tank containing hydrogen gas. You are able to heat or cool the tank and meaurse the pressure of the gas. 1.If you immersed in this solution a semi-permeable sack containing another solution of

    asked by cateye on April 23, 2012
  89. physics

    I;m sorry, but I was stuck on the second part of this problem. Can you please help me? An automobile engine slows down from 4500 rpm to 1500 rpm in 2.5 seconds. a) calculate angular accceleration b)calculate total number of revolutions done in this time.

    asked by Morgan on March 23, 2010
  90. physics

    I;m sorry, but I was stuck on the second part of this problem. Can you please help me? An automobile engine slows down from 4500 rpm to 1500 rpm in 2.5 seconds. a) calculate angular accceleration b)calculate total number of revolutions done in this time.

    asked by Morgan on March 23, 2010
  91. calculus

    consider the differential equation dy/dx= (y - 1)/ x squared where x not = 0 a) find the particular solution y= f(x) to the differential equation with the initial condition f(2)=0 (b)for the particular solution y = F(x) described in part (a) find lim F(x)

    asked by sammy on May 19, 2008
  92. Chemistry

    A solution of ammonia and water contains 2.90×1025 water molecules and 9.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution? any help would be great.

    asked by Pam on September 8, 2012
  93. Chemistry

    How many moles of KMn)4 are required to reach with the moles of Na2C2O4 in the last problem? and also, if the KmnO4 of the last problem is in 30.30mL of solution what is the molarity (M) of the KmnO4 solution?

    asked by Kim on March 3, 2009
  94. algebra

    A chemistry laboratory has supplies of two sulfuric acid solutions only. One is 10% concentrated and the other is 50% concentrated. How much of each solution should be mixed to make a 40 mL 25% sulfuric acid solution?

    asked by Nica on September 14, 2015
  95. Word Problem

    It is necessary to have a 40% antifreeze solution in the radiator of a certain car. The radiator now has 60 liters of 20% solution. How many liters of this should be drained and replaced with 100% antifreeze to get the desired strength?

    asked by Ford on October 20, 2010
  96. Chemistry

    How many grams of CO2 would be produced from the following reaction sequence? HI + KHCO3 -> KI + H2CO3 H2CO3 -> H2O + CO2 if 20.0 ml of 1.00 M KHCO3 solution is mixed with 20.0 ml of 1.50 M HI solution.

    asked by Kristi on November 15, 2011
  97. college algebra

    If there are 400 cubic centimeters of a chemical in 1 liter of solution (1000 cc=1 liter), how many cubic centimeters of water must be added to dilute it to a 25% solution?

    asked by tay on October 3, 2017
  98. chemistry

    In a solution of Al2(SO4)3 the Al3+ concentration is .12 M. What mass of Al2(SO4)3 is in 50 mL of this solution. Please explain the steps. Thanks. The Al3+ part confuses me the most.

    asked by Van M on August 26, 2011
  99. Chem 205

    A solution of ammonia and water contains 3.50×1025 water molecules and 9.00×1024 ammonia molecules. How many total hydrogen atoms are in this solution? Any help would be appreciated, thank you!

    asked by Melissa on September 11, 2016
  100. Chemestry

    Have two tanks of 100 liters each, with salt solution. One is at 9% and 4% other. How many liters at least must be removed from each container, so that upon mixing which is removed to obtain a 7% solution of salt concentration?

    asked by RFT on June 4, 2013

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