1. english

    thank you to the perosn who answered about the accent marks, but i meant how do you chose how a word is accented, my vocabulary test have words that need to have the accent marks put on which syllable is pronounced stronger and i can never tell. Accent

    asked by geena on September 25, 2006
  2. Trigonometry

    What value(s) of theta solve the following equation? cos^2(theta)-cos(theta)-6=0? I try plugging in different numbers but I am not sure exactly what I am looking for in order to solve?

    asked by Greg on November 14, 2012
  3. CHEMISTRY

    cell diagram:H2(g,1atm) Pt Enter part(a), (c) with 2 siginificant digits and part(b) with 3 siginificant digits. Enter scientific notation as 1.23E4. (a) What is Ecell if the unknown solution in the half-cell on the left has pH = 4.94? ____________ (b)

    asked by sabrina on November 30, 2012
  4. chemistry 12

    If the pH of a solution is 3.5, what colour will be shown by each of the following indicators in the solution? a)Methyl Violet b) methyl red c) Methyl orange d) phenolphthalein My answers: a) Yellow to Blue b) Red to Yellow c) Red to Yellow d) close to a

    asked by Sarah on October 13, 2011
  5. math

    A bicyclist rode into the 5h. In returning, her speed was 5 mi/h faster and the trip took 4h. What was her speed each way? distance =rate*time The distance is the same. y = rate going z = rate returning Going: d = y*t = y*5 = 5y return: d = z*t = z*4 = 4z

    asked by cheryl on March 19, 2007
  6. English

    1. I am going to do volunteer work at a cultural center. 2. I am going to do volunteer work at a community center. 3. I am going to do volunteer work at a community cultural center. (Are they all the same? Which one do we have to use?) 4. I am going to do

    asked by rfvv on November 1, 2010
  7. Astro-Physics(Binary Star System)

    In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the

    asked by Ahsanur on July 3, 2014
  8. Physics

    In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the

    asked by Josh on July 7, 2014
  9. Government

    1. Presidents Bush and Obama's foreign policies with Iran were different for what reason? a. President Bush employed the Monroe Doctrine; President Obama did not. b. President Bush preferred to isolate the adversary; President Obama engaged the adversary.

    asked by girly girl on March 14, 2018
  10. physics

    A small bead of mass m is carried by a circular hoop of radius r which rotates about a fixed vertical axis. Show how one might determine the angular speed w of the hoop by observing the angle theta which locates the bead. Theta is measured to the right of

    asked by Jessi on October 31, 2009
  11. Chemistry

    A laboratory technician wants to determine the aspirin content of a headache pill by acid–base titration. Aspirin has a Ka of 3.0 × 10-4. The pill is dissolved in water to give a solution that is about 10-2 M and is then titrated with KOH solution. Find

    asked by J on November 17, 2016
  12. 3-D Coordinates Polar coordinates Precalculus Trig

    The U.S.S. Lollipop is on assignment in the Atlantic Ocean. It travels from a longitude of 70 degrees west to 20 degrees west, along the latitude of 40 degrees north. How far does it travel? (Assume that the radius of the Earth is 6,400 km.) Erm I don't

    asked by Cambridge on December 18, 2013
  13. Art

    which of the following would be the best criterion for evaluating this piece of art? (1 point) A. the characteristics of detailed portraits. B. the characteristics of perspective. C. the characteristics of photo-realism. D. the characteristics of

    asked by Catie on August 8, 2018
  14. Calc

    A a conical container of radius 5ft and height 20ft is filled to a height of 18ft of a liquid weighing 50.6lb/ft^3. How much work will it take to pump the contents to the rim? How much work will it take to pump the liquid of a level of 2ft above the rim?

    asked by Anonymous on February 10, 2013
  15. physics

    1)Under ideal conditions, if 300 J of work are required tolift a mass to a certain height, the same mass should provide ___ J to do work as it falls back to Earth. Can you please comment as to whether my answer of 300 J is correct? 2)___ is conserved

    asked by Shardi on March 6, 2011
  16. Algebra I

    Describe the set of all values indicated by the set {a:-4 < a is greater than or equal to 1}. Beth has $417 available to buy trees for her yard. She will buy the trees from Tim’s Trees & Landscaping, where they cost $37 each. Letting t represent the

    asked by stephaine on August 1, 2010
  17. Texas State History

    Please do not delete, I need help. 1. Is it reasonable to say that José Gutiérrez de Lara was an important part of Mexican independence? A. It is reasonable because he required supporters and sought out to help fron the U.S. B. It is reasonable because

    asked by ILTHSM_ on October 27, 2018
  18. Health

    There are many different ways to physically treat a medical condition rather than using prescribed drugs, select the method that apply below Answer Are Psychological Therapy*** Physical Therapy Cardiac Rehabilitation Massage Therapy*** there are three

    asked by London on May 25, 2016
  19. probability

    A new test for detecting a disease has been developed. Medical trials show that 92% o patients with the disease show a positive test result. If 4% of the population have the disease, determine the probability (to 3 decimal places) that: a.) a radnomly

    asked by jj reddick on November 4, 2010
  20. Physics

    A massless string runs around two massless, frictionless pulleys, where one pulley is attached to the ceiling, and the other is suspended with a mass m. An object with mass m = 17 kg hangs from one pulley. A force F is exerted on the free end of the string

    asked by Nikita on November 17, 2009
  21. FEEDBACK CONTROL SYSTEM

    Figure below shows the block diagram of a dc-motor control system (note the dc-motor is represented by G(s)= K(s+3)/s(s+1)(s+2).The signal N(s) denotes the frictional torque at the motor shaft. a) Find the transfer function H(s) so that the output Y(s) is

    asked by FeedbackHELP!! on October 9, 2013
  22. FEEDBACK CONTROL SYSTEM

    Figure below shows the block diagram of a dc-motor control system (note the dc-motor is represented by G(s)= K(s+3)/s(s+1)(s+2).The signal N(s) denotes the frictional torque at the motor shaft. a) Find the transfer function H(s) so that the output Y(s) is

    asked by FeedbackHELP!! on October 10, 2013
  23. Chemistry

    Question : State whether the following are true or false. SO2 gas changes the colour of a KMnO4(aq) solution They have taken this as false and given the following equation: SO2+H2O+2KMnO4-->K2SO4+MnSO4+H2SO4 (not balanced) But why they have taken this as

    asked by Shenaya on July 29, 2017
  24. geometry

    I am confuse as to how to actually work these problems. Please help!!! 1. You are planning to spend no less than $6,000 and no more than $10,000 on your landscaping project. a) Write an inequality that demonstrates how much money you will be willing to

    asked by Anonymous on May 31, 2008
  25. help plesse :)

    Which one of the following statement best describes what a budget is ? A.A method of figuring out the inflation rate. B.An organized plan for spending money C.A way to keep people from really enjoying life. D.A plan for saving money. so is it D ?

    asked by ciara on September 29, 2011
  26. Science

    Grasshoppers generally have the colour as their background. What would be the problem with using the mark/release/recapture method to estimate the size of a population of grasshoppers if you marked them with bright red mark.

    asked by Alyssa on September 28, 2009
  27. World history

    Indian schools Identify and describe at least three methods Indian schools used to sever Native Americans children from their culture and traditions. And why the school is using the method to "reform" the student.

    asked by Emma on November 13, 2016
  28. help please:)

    Which one of the following statement best describes what a budget is ? A.A method of figuring out the inflation rate. B.An organized plan for spending money C.A way to keep people from really enjoying life. D.A plan for saving money. i got C what do you

    asked by ciara on September 29, 2011
  29. business math

    A truck costs $35,000 with a residual value of $2,000. Its service life is five years. Using the declining-balance method at twice the straight-line rate, the book value at the end of 2 years is?

    asked by lawand on May 28, 2016
  30. math

    Which one of the following statements best describes what a budget is? A. A method of figuring out the inflation rate. B. An organized plan for spending money. C. A way to keep people from really enjoying life. D. A plan for saving money.

    asked by angel on June 14, 2012
  31. budgeting

    Which one of the following statements best describes what a budget is? A. A method of figuring out the inflation rate. B. An organized plan for spending money. C. A way to keep people from really enjoying life. D. A plan for saving money. I think its

    asked by Vickie on August 29, 2013
  32. Maths

    Formulate a general method for finding the distance between two skew (i.e., non intersecting) line in space. (Hint: the shortest line segment joining the two skew lines will be perpendicular to both of them).

    asked by Buma on December 19, 2018
  33. Philosophy

    Use the diagramming method for identifying the argument structure of the following: "The Democrats tend to be to the left on social policy, and the new Congress is controlled by the Democrats, so we can expect a swing to the left. Of course, there are

    asked by Anne on December 12, 2006
  34. Philosophy

    Use the diagramming method for identifying the argument structure of the following: "The Democrats tend to be to the left on social policy, and the new Congress is controlled by the Democrats, so we can expect a swing to the left. Of course, there are

    asked by Anne on December 13, 2006
  35. Axia

    Utilization of a SWOT Analysis is a common method of comparing Internal and External factors that impact an organization. What is the benefit of this type of analysis for a health care organization?

    asked by Christi on November 23, 2010
  36. Computer Information Systems

    Explain what method of output would be best for each of the following situations and explain why: hand held computer, color photograph, resume, memorandum, statistical report, company annual report. Thanks for any and all help.

    asked by G on July 13, 2008
  37. Art

    Movie proffesionals such as prop designers and graphic designers wor together to create a believable film. Which method of creating a believable screenplay is unique to the job of screenwriter

    asked by Me on February 15, 2016
  38. math

    suppose a student is taking multiple choice exam,A,B,C,D,E,with only one of the responses correct.describe the complement method for determining the probabilityof getting at least one of the questions correct on 15question exam,

    asked by rency on October 27, 2009
  39. Straight-line

    A truck costs $35,000 with a residual value of $2,000. Its service life is five years. Using the declining-balance method at twice the straight-line rate, the book value at the end of 2 years is?

    asked by Linda on June 1, 2015
  40. 6th grade fraction comparisons

    Which numbr is greater than 3/4. The possible answers are 75/100 , 11/12, 2/3 or 3/8. I thought that I would try the method of making the denominator the same by the lcd. 75/100 is equal to 3/4 mult denom/number by 3 and got 9/12 so don't know how to

    asked by Linda on June 9, 2011
  41. health

    Utilization of a SWOT Analysis is a common method of comparing Internal and External factors that impact an organization. What is the benefit of this type of analysis for a health care organization?

    asked by ROSA on November 6, 2010
  42. Written Communication

    How would you approach creating a negative message for a superior (such as a menager at work or an instructor) versus creating a message for a colleague, subordinate, or fellow student. The basic difference to me is that you cant afford to tell a manager

    asked by Tameka on March 6, 2007
  43. physics

    A square loop (side L) spins with angular frequency ω in field of strength B. It is hooked to a load R. Write an expression for current I(t) in terms of B,L,R,ω and t (enter omega for ω). (b) How much work is done by the generator per revolution?

    asked by Ulises on April 9, 2013
  44. AP ENGLish

    Many plays and novels use contrasting places (for example, two countries, two cities or towns, two houses, or the land and the sea) to represent opposed forces or ideas that are central to the meaning of the work. Explain this contrast within the play,

    asked by Alyssa on January 16, 2017
  45. calculus

    Please help me solve. I think increase = concave up and decrease = concave down? On the graph y = x^5-15x^3+10 for x what intervals is the function increasing, decreasing, concave up and concave down. Plot the critical points, plot and label the inflection

    asked by andy on July 21, 2012
  46. Geometry / Algebra 1

    (a) The surface area of the prism shown is 314 square meters. Write an equation that u can solve to find the value of w. side a=wm b=8m and c=(w+4)m (on the picture) I'm guessing u use the formula surface area=2ab+2bc+2ac??? Well if so I need all that

    asked by Ë̤T̤̈Ẅ̤ä̤z̤̈Ḧ̤ë̤r̤̈ë̤ ⍨ on September 5, 2013
  47. Math

    A square sheet of cardboard 100 cm by 100 cm is to have corners of side length x cut out. These cutouts will create flaps that can be folded up to form a box with no lid. The length and width of the base of the box are given by the expression (100 – 2x),

    asked by Alex on January 11, 2015
  48. CHEMISTRY

    Method for how to get answer? Thank you! For the equilibrium reaction below. To what is Kc equal? N2(g) + 3H2(g) ↔ 2NH3(g) a. [N2] + 3[H2] ------------------ 2[NH3] b. [N2][H2]3 ------------------ [NH3]2 c. 2[NH3] --------------- [N2]+ 3[H2] d. [NH3]2

    asked by Chemistry on April 6, 2014
  49. Calculus

    Use newtons method and the function f(x)=x^2-a to derive the mechanics rule. Mechanics Rule for approaching sqrt(a), a>0, is Xn+1=1/2(Xn+a/Xn), n=1,2,3,...

    asked by Elizabeth on July 20, 2012
  50. Chemistry

    Hello, I'm wondering what the difference is in method when it comes to finding the pH of a weak acid versus finding the pH of a strong acid? Thanks!

    asked by Rob on April 26, 2010
  51. algebra

    The sum of two numbers is 74. The larger number is 3 more than the smaller number. Find the numbers. i need to use substition method

    asked by BIBIN on March 22, 2012
  52. Algebra 1

    How can I determine a equation from a graph? How can I determine how to graph y = x^2 + x - 2? Or y = x^2 - 4x + 4? Am I supposed to use the slope method (rise and run)?

    asked by Victoria on June 10, 2014
  53. Pure Math Coordinate Geometry

    The Point O Is(0,0) and Point B is(6,9).Point A lies on the line OB.The ratio of OA:AB=2:1.Find the coordinates of Point A. (Method Needed Mostly)thanks....

    asked by Ackron.Z on September 6, 2016
  54. Calculating delta H

    I honestly don't know where I went wrong with my calculations. I've been adding the products separately. Then I add the reactants separately. Finally, I take the product and subtract from the initial. Could you do this so I can double check my work? HCl +

    asked by Anne on June 12, 2018
  55. Chemistry

    Sorry Dr. Bob, I wsa looking for the Sucrose, not all 16 calculations. Can you help me with the Sucrose? I have 93.954 mL of a generic cola solution. The solution contains: Molarity of H++1.005e-7 Molarity of OH- = 1.005e-7 Molarity of Sucrose(aq) =

    asked by Emily on November 3, 2011
  56. physics

    You have a tuning fork of unknown frequency. When your ring it alongside tuning fork with frequency of 360Hz, you hear beats at frequency of 2 Hz. When you ring it alongside tuning fork with known frequency of 355Hz, you hear beats at a frequency of 3Hz.

    asked by silly on May 2, 2011
  57. windows 2003 server

    You are the network administrator for an outdoor equipment wholesaler in Detroit, MI. You have three locations. One is the head office from which the ordering and distribution is handled. The other two locations are retail outlets—one in a retail park on

    asked by ajay on February 1, 2007
  58. child development does it sound ok

    During the early adolescence (ages 12-14) the teens are very moody. As puberty is in full swing they will experience rapid body changes. The teens are sensitive to their body as it changes. Girls tend to be less fulfilled about their body image. Most want

    asked by scooby on January 15, 2010
  59. Chemistry

    At 25 degrees Celsius all of these are true for a neutral solution : pH = 7.00, pOH = 7.00, and [H+] = [OH-] is that correct? For a neutral, aqueous solution regardless of temperature.. would the only correct statement be [H+] = [OH-]? pH = 7.00 and pOH =

    asked by Katherine on April 16, 2012
  60. Chemistry

    Calculate ΔG at 25°C for the precipitation of lead(II) iodide from mixing 100. mL of 0.10 M lead(II) nitrate solution with 100. mL of 0.10 M sodium iodide solution. The ΔG° for this precipitation reaction at 25°C = −46.2 kJ/mol.

    asked by DrBob21 on February 27, 2017
  61. Chemistry

    A 25.00 mL sample of sulfuric acid is titrated with 6.02 x 10^2 M barium hydroxide. The equivalence point is reached at 21.68 mL of barium hydroxide solution. what is the molarity of the sulfuric acid solution?

    asked by jess on February 23, 2016
  62. Chemistry

    Calculate the concentration of chloride ions in the following solution. 73.28g of sodium chloride in 862. mL of solution. would it be 73.28g x 2 / 58.44g NaCl = 2.50 mol of Cl 2.50 mol Cl / .862 L = 2.91 M Cl

    asked by Anonymous on September 18, 2016
  63. chemistry

    what mass of barium sulphate can be produced when 100.0 ml of a 0.100M solution of barium chloride is mixed with 100.0 ml of a 0.100M solution of Iron(lll) sulphate?

    asked by NONO on November 20, 2011
  64. Chemistry

    Calculate the change in PH when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl. And calculate the change in PH when 6 ml of 0.1 M NaOH is added to the original buffer solution.

    asked by Mima on March 27, 2012
  65. chem

    An ethylene glycol solution contains 23.9 g of ethylene glycol (C2H6O2) in 86.9 mL of water. Compute the freezing point and boiling point of the solution. (Assume a density of 1.00 g/mL for water.)

    asked by Sara on May 21, 2011
  66. chemistry

    What mass of barium sulphate can be produced when 100.0 mL of a 0.100 M solution of barium chloride is mixed with 100.0 mL of a 0.100 M solution of iron (III) sulphate? Please explain!

    asked by Rachel on December 12, 2011
  67. Chemistry

    An etheral solution contains benzoic acid, 9-fluorenone, abd ethyl 4-aminobenzoate. Why would benzoic acid and 9-fluorenone not be extracted from this etheral solution by aqueous HCl ?

    asked by Samantha on May 15, 2012
  68. Chemistry

    Calculate the change in PH when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl. And calculate the change in PH when 6 ml of 0.1 M NaOH is added to the original buffer solution.

    asked by Mima on March 27, 2012
  69. Chemistry PLEASE

    an empty 3.5 L container weighs 650 g when empty. When filled with a 3.5%, by mass, of salt solution, the total mass then is 3.375 kg. How many grams of salt are there in the solution in the container?

    asked by Andrea on September 26, 2011
  70. Chemistry

    PLEASE HELP!! 40 mL of 0.1 M solution of a weak acid (adjusted to a pH of 7.75) is titrated with 0.2 M HCl to a final pH of 2.1. Once the pH of the weak acid reaches 2.1, it is then titrated with 20 mL of 0.25 NaOH. What is the final pH of the solution?

    asked by AA on October 17, 2013
  71. chemistry

    The temperature of a dilute 0.847 M solution of NaBr was increased from 25 degrees Celcius to 40 degrees Celcius. What effect did this temperature change have on the molarity of the NaBr solution?

    asked by bob on January 3, 2013
  72. Multiplying and Dividing Rational Expression

    Can someone solve these for me?Can someone correct meif I didn't type these right 1.(m-2)/(m-5)*(m+5)/(m-2) 2.4(x+2)/5x*(6x^2)/2x 3.(25-x^2)/12*6/(5-x) 4.(a^2-9)/a^2*(a^2-3a)/(a^2+a-12) 5.(5x-5)/(16)/(x-1)/6 6.(6-3x)/(5)/(4x-8)/25 7.(x^2-9)/(4X+12)/(x-3)/6

    asked by mike on May 16, 2007
  73. Chemistry

    ---This was the previous one--- Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all of which are colorless.

    asked by Gg on October 7, 2014
  74. Chemistry

    In the laboratory exercise "Preperation and Properties of Polymers", polyvinyl alcohol is dissolved in water and then reacted with borax (Na2B4O7·10H2O) in water. Which of the following are expected results of this reaction? True or False? 1. Polyvinyl

    asked by Chem on April 22, 2011
  75. Physics

    Can someone help me solve this problem? This example problem will help me solve the actual homework problems If an 0.6kg apple is dropped from 0.5m height onto a seesaw and flips up a 0.25kg kiwi. To what height does that kiwi reach. Assume all the energy

    asked by Mariam on February 1, 2018
  76. ALgerba 2

    I would really appreciate help on these equations. 3. Devon tosses a horseshoe at a stake 30 feet away. The horseshoe lands no more than 3 feet from the stake. (a) Write an absolute value inequality that represents the range of distances that the horseshoe

    asked by Peter on March 10, 2009
  77. Math

    Mr.jacobs budgeted $1,200 for tiles. His sketch of the floor requires him to use 38 white tile. each white tile cost $12. Write and solve an inequality to find the maximum amount he can spend on his brown tile. I'm not sure how to write and solve the

    asked by Penelope on August 20, 2015
  78. ALGEBRA 2

    would really appreciate help on these equations. 3. Devon tosses a horseshoe at a stake 30 feet away. The horseshoe lands no more than 3 feet from the stake. (a) Write an absolute value inequality that represents the range of distances that the horseshoe

    asked by Peter on March 10, 2009
  79. I need help again

    A car enters a turnpike 22 miles north of a town. The car travels north at an average speed of 64 miles per hour. How far is the car from the town after 4 hours? How do you solve the linear function then solve the problem? If you could help me understand

    asked by Priscilla on November 5, 2015
  80. Algebra

    What is the difference between and equation and an expression? Include an example of each. Can you solve for a variable expression? Explain. Can you solve for a variable in an equation? Explain. Write a mathematical phrase of sentence that can be

    asked by Michelle on February 9, 2010
  81. government

    How did Brown v. Board of Education overturn Plessy v. Ferguson? A. The Court ruled that the Plessy ruling applied only to private schools. B. The Court ruled that separate white and black school systems were inherently unequal. C. The Court ruled that

    asked by dbh on April 19, 2019
  82. chemistry

    Need help stepping through this for a review. I need to prepare 40grams of a 29% sugar solution. How do I calculate how much sugar and how much water is needed? Was given this formula: weight% (w/w)=100 * (mass of solute/total mass of solution) I set up my

    asked by j3z on February 3, 2015
  83. Chemistry

    I am very confused on this problem. Any help would be great: 50 g of silver nitrate is mixed with 50 g of hydrochloric acid in a water-based solution. A white precipitate forms (silver chloride.) The solution is filtered and the white precipitate collected

    asked by Ted on June 23, 2009
  84. Chemistry

    A solution contains one or more of the following ions: silver, barium, and Copper (II). CY 105 student adds sodium chloride to a small sample of the solution of the unknown and a white precipitate is formed. He/she filters out the precipitate and then add

    asked by Allison on March 10, 2015
  85. college algebra

    Isn't this a plug and chug? I will be happy to critique your thinking. Your equal signs in the function are not correct, I assume that is a typo. suppose a baseball is shot up from thr ground straight up with an initial velosity of 32 feet per second . A

    asked by bobpursley on June 10, 2007
  86. Algebra 2

    One hundred liters of a 57.84% acid solution is obtained by mixing a 75% solution with a 42% solution. How many liters of each must be used to obtain the desired mixture? A) 40 liters of 75% acid and 60 liters of 42% acid B) 53 liters of 75% acid and 47

    asked by Lewis on November 23, 2016
  87. Algebra 2

    One hundred liters of a 57.84% acid solution is obtained by mixing a 75% solution with a 42% solution. How many liters of each must be used to obtain the desired mixture? A) 40 liters of 75% acid and 60 liters of 42% acid B) 53 liters of 75% acid and 47

    asked by Lewis on November 23, 2016
  88. business ethics

    2. Reah filed a case against her employer who dismissed her from service for reporting to work under the influence of alcohol. Which of these would be valid reason to contest the dismissal? a.)Reah's employer had not listed reporting to work after

    asked by vedrana on July 18, 2011
  89. Reiny! Reiny! Reiny! Answer Check and HW Help!

    Translate to a system of equations and solve: 1) The sum of two numbers is 36. One number is 2 more than the other. Find the numbers. Answer: (17,19) 2) Find two numbers whose sum is 66 and whose difference is 18. Answer: (37,29) These ones I am not sure

    asked by Britney on February 12, 2009
  90. Chemistry

    An aqueous solution that 2.00 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.00×10−2 M in Cl− and 0.260 M in I−. When the second ion begins to precipitate, what is the remaining concentration of the first ion? I know that

    asked by Sydney on June 5, 2016
  91. chemistry

    A sample of water is found to contain 0.059 ppm of Pb2+ ions. Calculate the mass of lead ions per liter of this solution (assume the density of the water solution is 1.0 g/mL) 1.2E-2 g/L Pb2+ 5.9E-8 g/L Pb2+ 5.9E-5 g/L Pb2+ 1.2E-5 g/L Pb2+ 2.9E-10 g/L Pb2+

    asked by Heaton on February 5, 2012
  92. chemistry

    A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.39{\rm \\%} naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr.

    asked by kales on February 8, 2015
  93. Chemistry (Acid/Base)

    Consider a solution made by mixing 100 mL of 2.0 M acetic acid (Ka= 1.8e-5) with 100 mL of 0.00020 M benzoic acid (Ka= 6.4e-5). How many moles of solid NaOH must be added to the solution so that half of the benzoic acid is protonated (i.e. such that [HA] =

    asked by Emily on April 9, 2015
  94. chemistry

    A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentration of 11.07 % naphthalene by mass. Calculate the vapor pressure at 25 ∘C of hexane above the solution. The vapor pressure of pure hexane at 25 ∘C is 151 torr.

    asked by elizabeth on September 24, 2016
  95. chemistry

    Draw the tritration curve for the neutralization of a 100ml sample of 1M solution of HCl with a .6M solution of Naoh point 1: 2 ml NaOH edded point 2: 40 ml NoOH ADDED POINT 3: EQUIVALENCE POINT 4: 80 ML NaOH added

    asked by sam on April 3, 2011
  96. chemistry

    In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same

    asked by george on November 4, 2010
  97. chem

    A 27.4 mL sample of an unknown HClO4 solution requires 45.4 mL of 0.101 M NaOH for complete neutralization. What was the concentration of the unknown HClO4 solution? The neutralization reaction is shown below. HClO4(aq) + NaOH(aq) H2O(l) + NaClO4(aq)

    asked by BOBBY on March 14, 2011
  98. english

    Given the context which meaning best fits the use of the word meanest a. dullest b. stingiest c. unkindest d. most ashamed e. least important passage: Yet, love, mere love, is beautiful indeed And worthy of acceptation. Fire is bright, Let temple burn, or

    asked by Henry on September 24, 2018
  99. calculus

    Find the average rate of change f(x)=x^3-8x+9 a. from -3 to -2 b. from -1 to 5 c. from 5 to 9 A. what is average rate of change of f(x)=x^3-8x+9 from -3 to -2? B. what is the average rate of change of f(x)-x^3-8x+9 from -1 to 5? C. what is the average rate

    asked by confused--please help on December 12, 2012
  100. Social studies

    What legacy did Emperor Justinian leave for modern Europe? A legal code that organized Roman laws. (MY ANSWER) A treaty with the Roman Catholic Church. A method of absolute rule. An ancient sports stadium.

    asked by LOVE on February 18, 2016

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