1. Chemistry

    In the lab we synthesised nickel (II) ammine tetraflouroborate using hydrated nickel chloride and ammonia then this solution was added to a slotion of ammonia and ammonium tetraflouroborate,now im struggling to write a fully balanced chemical

    asked by Sikhulile on April 23, 2016
  2. Chemistry

    Raoult's Law and Ionic or Organic Solutions At 55.0 C, what is the vapor pressure of a solution prepared by dissolving 62.8 g of LiF in 247 g of water? The vapor pressure of water at 55.0 C is 118 mmHg. Assume complete dissociation of the solute.

    asked by Saira on January 25, 2010
  3. college chemistry

    Calculate the [CH3NH3+] of a 7.02×10-3 M solution of the weak base CH3NH2 (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. CH3NH2 + H2O = CH3NH3+ +

    asked by sparkle on October 26, 2010
  4. Chemistry

    What is the pH of the solution created by combining 2.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted

    asked by Ashley on May 3, 2010
  5. Chemistry

    If the 50.00mL sample from problem 3 above was titrated with EDTA,what volume of a 0.00420 M EDTA solution would be needed to reach the endpoint? (Your answer should be given in milliliters.) (Problem 3 found that .0000625 moles of calcium carbonate were

    asked by Alex on November 13, 2015
  6. Chemistry

    A compound is known to be a cesium halide, CsX. If 3.00 grams of the salt is dissolved in exactly 100.0 grams of water, the solution freezes at -0.735°C. What is the chemical formula for the salt? i know it would be -0.735= -1.86 * m m= 3g/ X g/mol/kg

    asked by Susy on February 20, 2014
  7. Chemistry

    What is the pH of the solution created by combining 2.70 mL of the 0.10 M NaOH(aq) with 8.00 mL of the 0.10 M HCl(aq)? with 8.00 mL of the 0.10 M HC2H3O2(aq)? What are the pH values if you take into account that the 8.00 mL of 0.10 M Acid was first diluted

    asked by Ashley on May 3, 2010
  8. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.500. If a trial's absorbance is measured to be 0.310 and its initial concentration of SCN– was 0.0010 M, the

    asked by John on June 20, 2011
  9. Chemistry

    A volume of 5oo ml of potassium sodium tartrate solution S1 of c1=0.21mol/l is to prepared. Determine the mass of hydrated potassium sodium tartrate of formula KNaC4H4O6.4H2O needed for this preparation .(molar atomic masses : H=1;C=12;O=16;Na=23;K=39)

    asked by Roro on February 22, 2014
  10. Chemistry

    The active ingredient of the antacid is CaCO3 and so Sally chose titration with HCl as a method for analysis. What is the mass (in g) of the CaCO3 in the sample of antacid, if it is titrated by 21.2 mL of HCl solution with concentration of 0.1048 mol/L to

    asked by Cody on March 14, 2010
  11. Biochemistry

    A buffer solution is prepared by mixing 2.50 mL of 2.00M sodium acetate with 3.30mL of 0.500M HCl and diluting the buffer with water to a final volume of 500.0mL. pK acetic acid: 4.76 what is ph of buffer? what is final concentration of buffer?

    asked by Maria on February 4, 2014
  12. Chemistry

    so i had to calculate the pH of a 100ml solution of .10M acetic acid (ka=1.8x10(-5) I came out to 2.87. But then, they want the pH if 50ml HCL is added. So i thought...Ka = x2/.15M, therefore the square root of .15M x 1.8x10(-5) = .00164(concentration). So

    asked by Kevin on October 20, 2011
  13. chem

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, what is the

    asked by anonymous on April 10, 2008
  14. Chem-Diprotic Acid

    Ascorbic Acid is an organic diprotic acid, H2A, that is found in many natural materials. KA1=7.94x10^-5 and KA2=1.62x10^-12. If you start with a 0.75 M solution of H2A, what is the concentration of ALL species in the solition at ph=3.8? I have no idea how

    asked by Matt on December 7, 2014
  15. chemistry

    This refers to your archive question in 2014 Oct 30 at 4.58 posted by Ruzzle and replied by DrBob222. Small query on the solution , which states 1/6 of D atoms will go to form D2O18. Isn't it 2/6 since out of all 6 D atoms 2 is required to form D2O18.

    asked by senaka on March 13, 2017
  16. Chemistry

    Assuming that Raoults law is followed what would be the vapour pressure of a solution formed when 40g of sugar (molecular mass 342g) is dissolved in 360ml of water at 25oC? At 250C,the vapour pressure of water is 20mm and the density is 1g/ml.

    asked by Aarohi on May 30, 2017
  17. 12th grade chemistry

    A piece of iron wire weighs 2.225g. It is dissolved in acid, which oxidizes the iron to iron(II), and made up to 250 mL. A 25mL sample required 31.0 mL of a 0.0185mol/L solution of potassium dichromate. Calculate the percentage of iron in the wire.

    asked by jerry on November 10, 2008
  18. chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.520. If a trial's absorbance is measured to be 0.275 and its initial concentration of SCN– was 0.00060 M, what is the

    asked by Amy on April 8, 2008
  19. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.530. If a trial's absorbance is measured to be 0.150 and its initial concentration of SCN– was 0.00070 M, the

    asked by Sam on April 9, 2008
  20. chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.510. If a trial's absorbance is measured to be 0.250 and its initial concentration of SCN¡V was 0.00050 M, the

    asked by Gloria on April 10, 2008
  21. chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.500. If a trial's absorbance is measured to be 0.310 and its initial concentration of SCN– was 0.0010 M, the

    asked by thuy on February 22, 2008
  22. Physics

    A capacitor is made from two 1.2 cm diameter coins separated by a 0.18 mm thick piece of paper (K = 3.7). A 6 V battery is connected to the capacitor. How much charge is on each coin? My solution: C= K * Permitivity * A/d = q/v I solved for q and got 1.2 X

    asked by BLESSED on February 6, 2008
  23. Differentail Equations

    I cant figure out how to do this type of problem! Consider the first order differential equation y′+(x/(x^2−4))y=(e^x)/(x−9) For each of the initial conditions below, determine the largest interval a

    asked by Eric on June 6, 2015
  24. Science

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.550. If a trial's absorbance is measured to be 0.350 and its initial concentration of SCN– was 0.0010 M, the

    asked by Bobby on November 3, 2008
  25. chemistry

    Hi DrBob222, this is regarding my Determining Ka of Acetic acid lab I talked about on April 5, 2008. Refer to the volume of NaOH on your graph from question 2. Calculate half this volume and on your graph, find the pH when the solution was half

    asked by Sarah on April 6, 2008
  26. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.550. If a trial's absorbance is measured to be 0.350 and its initial concentration of SCN– was 0.0010 M, the

    asked by Tom on June 28, 2008
  27. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.500. If a trial's absorbance is measured to be 0.310 and its initial concentration of SCN– was 0.0010 M, the

    asked by Chem help on August 10, 2008
  28. algebra

    Solve. Simplify your answer. Type an exact answer using radicals as needed. y^2 + 31 = 12y Solution y = {8.236067978, 3.763932022} 1. y =(12-√20)/2=6-√ 5 = 3.764 2. y =(12+√20)/2=6+√ 5 = 8.236 Which would be the correct way to answer this equation,

    asked by slomo on February 3, 2015
  29. Chemistry

    The standard solution of FeSCN2+ (prepared by combining 9.00 mL of 0.200 M Fe(NO3)3 w/1.00 mL of 0.0020 M KSCN) has an absorbance of 0.500. If a trial's absorbance is measured to be 0.310 and its initial concentration of SCN– was 0.0010 M, the

    asked by Anonymous on June 29, 2008
  30. Chemistry

    Which solution will have the lowest pH? a. 0.10 M HClO2, pKa = 1.96 b. 0.10 M HCN, pKa = 9.21 c. 0.10 M HF, pKa = 3.19 d. 0.10 M HClO, pKa = 7.538 e. 0.00010 M HCl Does the lower the pka stronger the acid, means the lower the ph, so the answer is A?

    asked by Anonymous on November 29, 2015
  31. Chemistry

    If 20mL of a 0.100 M NaOH solution are required to titrate 0.25 grams of an unknown acid, what is the equivalent mass of the acid? If the acid actually contains 3 moles of H+ per mole of acid what is the molecular mass of the acid?

    asked by Linda on February 4, 2014
  32. Art

    in modern printing technology what important type of plate is created a nickel salt solution? Copper plate •• Printing plate Master plate Money plate Correct this if you can

    asked by Tj on February 26, 2016
  33. math

    luke put 2 red pens, 7 blue pens, and 1 black pen in a bag, closed it and shook it up. if the pens are the same size, weight and texture, what is the probally of choosing a red pen? a red or black pen? what is the probability of not choosing a blue pen? if

    asked by bessie on March 29, 2010
  34. Language Art's

    4. How has the political climate of Boston changed since the beginning of the book? (1 point) Previously, Bostonians considered themselves loyal British subjects, but after Parliament passed the Tea Act, they thought of themselves as citizens of an

    asked by YRN DJ on January 5, 2016
  35. Chemistry

    If 32.3 grams of KCl are dissolved in 192 grams of water, what is the concentration of the solution in percent by mass? 5.94% KCl 8.55% KCl 14.4% KCl 16.8% KCl Can someone explain this to me? I don't want the answer I just want to know how to find it.

    asked by Acasia on February 20, 2017
  36. pre-calculus

    R(x)=x^2+x-6 ________ x-3 1. find the domain and y-intercepts 2. find the x-intercepts 3. find the real solution of the equation 4. find the horizontal or oblique asymptotes 5. find the x-axis 6. plot the points

    asked by ladybug on September 29, 2012
  37. history plz help

    Explain how the U.S. became involved in the politics of Southeast Asia. o Explain how this involvement affected the U.S. political climate of the 1950s. can you please help me find some info for this please. So i have a better understanding to do a

    asked by scooby on November 29, 2009
  38. history(am i correct)

    o Explain how the U.S. became involved in the politics of Southeast Asia. o Explain how this involvement affected the U.S. political climate of the 1950s. can you please help me find some info for this please. So i have a better understanding to do a

    asked by scooby9132002 on November 28, 2009
  39. history(answer incl, am i correct)

    o Explain how the U.S. became involved in the politics of Southeast Asia. o Explain how this involvement affected the U.S. political climate of the 1950s. can you please help me find some info for this please. So i have a better understanding to do a

    asked by scooby on November 29, 2009
  40. lit class

    what is the allusion in the passage from a letter written by a world war I veteran in the mid 1920's well we are finally getting what we richly deserve. the adjusted compensation act law. Even Calvin Coolidge wouldn't put his john Hancock on the bill

    asked by mike on May 16, 2011
  41. Calculus

    Twins, Pierre and Francesca were each given 100 dollars on their 15th bday. they immediately put ther money into their individual money boxes. Each week throughout the next year they added a portion of their weekly pocket money. Puerre added 10 each week.

    asked by Daisy on January 22, 2008
  42. Science

    1. Glucose is a simple sugar made up of carbon, hydrogen, and oxygen. What kind of molecule is glucose? A) Glucose is protein B) Glucose is a nucleic acid*** C) Glucose is an organic molecule D) Glucose is an inorganic molecule 2. Glucose is a simple

    asked by orangygirl on January 21, 2016
  43. I Have To Write A 2 page Essay---HELP PLZ!!!

    I have to write down all the factors in my early life that have influenced the way I developed. Then I have to use those factors in an essay. What factors besides hereditary factors and enviromental factors, can I list? Can you suggest maybe a way to begin

    asked by Mandy on November 11, 2006
  44. Physics Please Answer

    A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in

    asked by Steve on July 13, 2013
  45. SCIENCE,PHYSICS

    A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in

    asked by GT on July 10, 2013
  46. help physics

    A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in

    asked by Steve on July 14, 2013
  47. chemistry

    consider a crystallization of sulfanilamide in which 10 mL of hot 95% ethyl alcohol is added to 0.10 g of impure sulfanimide. after the solid has dissolved, the solution is cooled to room temp. and then placed into an ice-water bath. no crystals for, even

    asked by BOB on October 7, 2008
  48. Chemistry

    A mixture of ethane and ethene occupied 35.5 L at 1.000 bar and 405 K. This mixture reacted completely with 110.3 g of O2 to produce CO2 and H2O. What was the composition of the original mixture? Assume ideal gas behavior Im pretty sure i use dalton's law

    asked by Drew on September 19, 2012
  49. physics (mirror)

    a diverging mirror of 52.0 focal lenght produces a virtual image of 26.0cm from the mirror. how far from the mirror should the object be placed? solution f=-52.0cm, v=-26.0cm 1/u + 1/v = 1/f rearranging the terms 1/u = 1/f - 1/v substituting the values of

    asked by Matrix School 2 on July 28, 2009
  50. math

    a number has 4 digits. no digits in the number are repeated. the digit in the tens place is three times the digit in the thousands place. the number is odd. the sum of the digits in the number is 27. what is the number? I started with the 10s and 1000s

    asked by ciera on March 5, 2007
  51. logic

    Sometimes people get caught in a “downward spiral,” a case in which something leads to a result which in turn leads to more of the original thing, bringing on more of the result. As the process continues, the result continually gets worse and worse. An

    asked by kim on October 31, 2010
  52. Biochem

    Desribe the preparation of 2.00 L of 0.100M pH 9.00 glycine starting with the sodium chloride salt of zwitterionic glycinhe and 1.00M NaOh. If a reaction that generated 2.00 mmoles of base were carried out in 100 mL of the above buffer, what would be the

    asked by Sandra on September 13, 2011
  53. Basic Communications

    I'm trying to add more details to this paragraph on my assignment: Lastly, Temporary Marriage Licenses are not a good solution to high divorce rates because couples in a boyfriend-girlfriend relationship should look into all the responsibilities that the

    asked by Alex L. on December 4, 2011
  54. English

    I left out the following statements which I really find it difficult to rephrase.Thank you very much! 1) He considers death from two perspectives: one is the stoic attitude to put an end to life and human misfortune, the second is the hesitation about an

    asked by Henry2 on January 5, 2012
  55. Algebra

    The answer in the book however says -(5x^2-17x-9)/(x-3)(x+2) so I don't know what I am doing wrong, can you take me step by step through the problem. I have a lot of problems, but I think once I understand what I am doing wrong with this one I can get the

    asked by Sara on July 20, 2007
  56. grammar

    If I have to put a apostrophe in this sentence would it be like this The Henderson's never change;They're always complaining about Mr. Scobb farming land that is rightfully their's. No. There is no apostrophe after names and after their. The Hendersons

    asked by patti on November 22, 2006
  57. Chem (electron transfer)

    KMnO4 + HCl → MnCl2 + Cl2 + H2O + KCl If the reaction occurs in an acidic solution where water and H+ ions are added to the half-reactions to balance the overall reaction, how many electrons are transferred in the balanced reduction half-reaction? The

    asked by Summer on April 2, 2018
  58. chemistry

    an aqueous solution contains 2 solutes A&B.A is soluble in hexane,B is not.Hexane is liquid at rom temperature and does not mix with water.The density of hexane at room temperature is 0.7g/dm3.Describe giving full practical details how you would produce a

    asked by Natalia on February 11, 2010
  59. AP Chemistry- please help!

    Glycerol (a non-electrolyte that can be used as antifreeze and coolant in a car radiator) has a density of 1.261 g/mL and a molecular weight of 92 g/mol. If 111 mL of glycerol are mixed with 5.1 kg of water, by how much would the boiling point of the

    asked by Anonymous on April 5, 2018
  60. Chemistry (concentration)

    H2SO4(aq) + 2LiOH(aq) → Li2SO4(aq) + 2H2O(l) 3.2 moles of LiOH enter the reaction and are fully consumed. The molar mass of Li2SO4 is 110 g/mol. The final aqueous solution has a volume of 4.0 L. What is the final concentration of Li2SO4 in g/L? 44

    asked by Summer on April 11, 2018
  61. math

    Please show all of your work in the space below. Please present and organized and complete solution. A garden will be made up of a parallelogram, a rectangle and a triangle. The garden must have an area of 500m square. Draw two possible gardens. Determine

    asked by jhon on November 22, 2013
  62. Chemistry

    An aqueous solution of ammonium nitrate NH4NO2 decomposeds when heated to give off nitrogen. This reaction may be used to prepare pure nitrogen. How many grams of ammonium nitrite must have reacted if 3.75dm^3 of nitrogen gas was collected over water at 26

    asked by Lauren on October 23, 2007
  63. Chemistry

    A student was given a 2.45 g of impure potassium sulfate (K2SO4) sample. He dissolved this sample in 100 mL of water first and then added some barium chloride (BaCl2) solution. A 2.15 g of BaSO4 precipitate was obtained at the end of the reaction. What is

    asked by Anonymous on November 22, 2014
  64. Intermediate Algebra

    Andrews factored expressions -6x63+9x^2-3x as -3x(2x^2-3x-1). But when Melissa applied the distrubutive law and multiplied out -3x(2x62-3x-1) she got -6x^3+9x^2+3x;thus Andrews solution does not appear to check. Why is that? Please help Andrews to

    asked by ladybug on June 13, 2012
  65. AP Chemistry- please help!

    Glycerol (a non-electrolyte that can be used as antifreeze and coolant in a car radiator) has a density of 1.261 g/mL and a molecular weight of 92 g/mol. If 111 mL of glycerol are mixed with 5.1 kg of water, by how much would the boiling point of the

    asked by Kayla on April 5, 2018
  66. ela

    1How are Julie’s parents different from her friends’ parents? Julie’s parents celebrate Halloween, and her friends’ parents do not. Julie’s parents like tea much more than her friends’ parents do. Julie’s parents have different jobs than her

    asked by gaaaa on February 6, 2019
  67. college essay cover letter

    Can someone edit this Dear Admissions, I was pleased to find that the University of Connecticut allowed for applicants to submit a writing supplement along with their applications. So, I have taken this opportunity to show the main experiences that I have

    asked by chhristine on November 15, 2013
  68. math

    Ms.Hernandez has 17 tomato plants that she wants to plant in rows.She will put 2 plants in some rows and 1 plant in the others.How may different ways can she plant the tomato plants? make a table to solve.Ms.Hernandez can plant the tomato plants.....ways.

    asked by leisa on November 26, 2013
  69. chemistry

    Sometimes the basicity of a solution is reported using pOH (pOH = -log[OH-]). What is the a. [OH-] if pOH = 1.90 b. [H3O+] if pOH = 12.94 c. pH if pOH = 9.70

    asked by amber on March 18, 2014
  70. math

    Please help, 1) How do you solve 2017^2017 without a calculator? 2) What is the last digit of the solution to this problem: 2017^(2017^2017)? Thank you!

    asked by Onet on March 10, 2017
  71. Chemistry

    Sometimes the basicity of a solution is reported using pOH (pOH = -log[OH-]). What is the a. [OH-] if pOH = 1.90 b. [H3O+] if pOH = 12.94 c. pH if pOH = 9.70

    asked by chelsey on March 11, 2014
  72. calculus II

    ∫ tan^2 x sec^3 x dx If the power of the secant n is odd, and the power of the tangent m is even, then the tangent is expressed as the secant using the identity 1 + tan^2 x = sec^2 x I thought that since tan is even and sec is odd, we have to put this in

    asked by Sarah on March 2, 2013
  73. English

    Could you help me check these sentences, please? They refer to the same theme as yesterday's ones. (Can you say that?) 1) We met my son’s ski instructor at the baby ski lift (?) at two sharp. 2) Most ski slopes are very simple and therefore suitable

    asked by Henry2 on December 28, 2011
  74. Math

    An external sinusoidal force is applied to an oscillating system which can be modelled by a model spring and a damper. The general solution of the equation of the motion is given by, x = 5 + 3.071cos(2πt – β) + 3.14exp(-7.96t) cos(αt + φ) where α,

    asked by Darren on September 3, 2012
  75. chem

    Assuming the volumes are additive, what is the [Cl-]solution obtained by mixing 210mL of 0.600M KCl and 630ml of 0.385M MgCl2 ? Responses chemistry - bobpursley, Friday, September 19, 2008 at 4:20pm You have to assume each chloride is soluble. How many Cl

    asked by jay on September 20, 2008
  76. algebra

    1. - 5(2x+2)is greater than or equal to -10x - 17 (1 point) a)x is greater than or equal to 7 b)x is less than or equal to 19 c)all real numbers d)no solution

    asked by Emily on October 27, 2011
  77. algebra inequalities

    can you check these tell if the number after the: color is a solution x < 7; 7 i say yes p > -3;3 i say yes k is greater than or equal to 5; 0 i say no 3z is less than or equal to 12;4 i say yes n - 5 > 3; 6 i say no 2g + 8 is geater than or equal to 3;-1

    asked by marko on November 1, 2011
  78. algebra

    Solve the system of linear equations by graphing 3x+y=0 2x-y=5 Graph the system What is the solution of the system of equations?

    asked by Shannon on March 10, 2015
  79. Chemistry

    In a saturated solution of silver phosphate, the concentration of silver is 4.5 x 10^-4 mol/L. What is the Ksp of silver phosphate?

    asked by Brittany on June 17, 2009
  80. chemistry

    What is the pH of the solution created by combining 12.00 mL of the 0.10 M base with 8.00 mL of the 0.10 M acid acid: acetic acid base: ammonia

    asked by unknown on April 9, 2008
  81. math

    Which ordered pair is not a solution of y = -12x - 3? a. (-3,33)* b. (8,-98) c.(-9, 105) d.(3,-39) plz check plz plz plz plz plz

    asked by alabama joe on March 15, 2019
  82. algebra

    determine the nature of the solutions of the equation. Two real solutions, two imaginary solutions, or one real solution. 2t^2-4t=0

    asked by sam on July 11, 2010
  83. math

    Chris puts one tenth of each paycheck into savings. Her current paycheck is $200. She decides to also put into savings, any amount she earns over $200. The expression below represents the percent of her paycheck that Chris saves when she makes x dollars

    asked by Anonymous on December 8, 2016
  84. Math

    7. Yvonne put $4,000 in a savings account. At the end of 3 years, the account had earned $960 in simple interest a. How much does she have in her account at the end of 3 years? b. At what annual simple interest rate did the account grow? Show your work. c.

    asked by Yea Boi on May 14, 2018
  85. english

    Have to summarize this: situationsDick Tracy, Li'l Abner, and other men of action belong to this type. Such people make good lifeguards and construction workers. They like to put out energy. They have lots of muscles and they like to use them. They go in

    asked by jennifer on February 7, 2016
  86. Spanish (Please help me)

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

    asked by Jessie on May 16, 2014
  87. Chemistry

    I've been working on this problem for hours and cant figure it out. I know it should be simple, but I'm stuck... The question is... Describe how to prepare 1.00L of a 1.0% (w/v) NaOH from a 2.0 M NaOH. *I need to figure out how many ml of the stock

    asked by James on January 10, 2013
  88. Math

    Did I solve this problem right? Here is the question: Use least common multiple or greatest common factor to solve this problem. Mark has 153 hot dogs and 261 hot dog buns. He wants to put the same number of hot dogs and hot dog buns on each tray. What is

    asked by B.B. on July 4, 2009
  89. 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
  90. maths

    solution to the question+from the starting point A, a person goes 10m east then 10m north reaching the foot of a vertical pole 5m high, on top of which a red light is fitted. what is the actual distance of the red light as observed from A?

    asked by Anonymous on April 2, 2012
  91. Electroplating in Chem

    Today I began an electroplating lab between a copper strip and a coin in electrolyte solution with a battery. I am struggling to figure out the copper half-reactions that occured, and whether they are reduction or oxidation. I only need two, and one is

    asked by kat on May 9, 2016
  92. chemistry

    calculate the morality of THE H2SO4 solution for each of the three runs. do the three values agree closely together with each other. Part A. Titration 1 volume of unknown acid =20ml initial buret reading of NaOH =0.5 ml final buret reading of NaOH=10.0ml

    asked by ALECIA on October 17, 2012
  93. Qualitative analysis

    X is a solution containing both sodium chloride and sodium sulfate. Three of the following solutions will produce a white precipitate on addition of X. Which one remains clear? A) Aqueous ammonia C) Lead(ll) nitrate B) Barium chloride D) Silver nitrate

    asked by Cheezel on November 17, 2016
  94. Inverse trigonometric functions

    How to find the value of arctan(2 sin (pi/3)) without using calculator or sketching a triangle. It is like taking u=something and then evaluating. Thanks. the solution relies on the fact that you should know the ratio of sides of the 30,60 90 degree

    asked by Jen on April 9, 2007
  95. Chemistry

    The aquation of tris(1,10-phenanthroline)iron(II) in acid solution takes place according to the equation: Fe(phen)32++ 3 H3O++ 3 H2O →Fe(H2O)62++ 3 phenH+. If the activation energy, Ea, is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,

    asked by Derek on December 2, 2014
  96. Chemistry

    Adding 1.530x10^3 J of electrical energy to a constant-pressure calorimeter changes the water temperature from 20.50C to 21.85C. When 1.75g of a solid salt is dissolved in the water, the temperature falls from 21.85C to 21.44C. Find the value of qp for the

    asked by Kayla on January 22, 2013
  97. chemistry

    To prepare the titrant fo amonia nitrogen analysis an analyst weight out 1.20 grams of concentration 98% sulfuric acid and brings to 1000 ml in lab pure water. if the molecular weight is 98 calculate the normality of the solution this analyst has prepare.

    asked by Faye on March 26, 2011
  98. Math

    Dear kind-hearted tutor, Can you check my solution on this question? Given f' (x) = {2x - 1, x≤1; x^2, x>1, find f’ (1) if exist. Since it asks to find f’ (1). I choose the first derivative because it satisfies the condition for 1. 2 x – 1 = 2 (1)

    asked by Adlina Saleh on August 3, 2016
  99. chemistry

    A student wants to determine of an irregularly shaped peice of sodium metal . The student is warned not to use water displacement to find the volume of the peice of sodium . Explain the reason for the warning and pffer a effective solution to the students'

    asked by nina on December 5, 2010
  100. Career Plans

    Does this make sense? My Plan A is to do something with geology. I take deep interest in learning about Earth's structure and about the universe. Exploring and discovering solution connecting with earth would be very intersting. I would somewhat be able to

    asked by Anonymous on January 27, 2011