1. calculus

    How do I solve for this 2 π ∫ from 1 to 3 (y (1-(y-2^2)dy) the answer is 16π/3 This is what I have try but couldn't get to the answer 2 π ∫ (y (1-((y-2)(y-2))dy ) 2 π ∫ (y (1-(y^2-4y+4))dy ) 2 π ∫ (y (1-y^2+4y-4)dy ) 2 π ∫ (y (-y^2+4y-3)dy

    asked by Anonymous on December 9, 2018
  2. AP Physics

    A bucket full of water (15kg) is swung in a vertical circle on a rope 1.5m long. What is the minimum speed it can be swung so that the water doesn't fall out at the top? With what was given, which equations do I need to use to solve for V?

    asked by Anonymous on November 3, 2010
  3. gr10 math

    The playing surface in the game of curling is a rectangular sheet of ice with an area of about 225 m^2. The width is about 40m less than the length. Find the approximate dimensions of the playing surface. How would i solve this?

    asked by Rebecca on May 31, 2011
  4. chemistry step by step for thank a lot

    10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of caco3. The answer 1000 who helps me to solve it for me step by step thank a lot

    asked by ken on July 6, 2014
  5. GEOMETRY

    If a diagnol for a rectangle ABCD was measured to be 20 and a square was put in it slanted(looking like a rhombus). This rhombus is called EFGH. Prove find the perimeter of EFGH. (IT IS EASIER TO DRAW IT THEN SOLVE IT =))

    asked by JEFF BOMB on November 13, 2009
  6. GEOMETRY

    If a diagnol for a rectangle ABCD was measured to be 20 and a square was put in it slanted(looking like a rhombus). This rhombus is called EFGH. Prove find the perimeter of EFGH. (IT IS EASIER TO DRAW IT THEN SOLVE IT =))

    asked by JEFF BOMB on November 13, 2009
  7. physics repost

    I am still trying to solve for H in this equation but I am still lost MgH = (1/2)*k*(H-2-10)^2 + Mg*2 I was told to expand the square on the right, gather terms, put it in the standard quadratic form, and use the quadratic formula, but I don't know how.

    asked by Chris Adison on April 24, 2008
  8. physics repost

    I am still trying to solve for H in this equation but I am still lost MgH = (1/2)*k*(H-2-10)^2 + Mg*2 I was told to expand the square on the right, gather terms, put it in the standard quadratic form, and use the quadratic formula, but I don't know how.

    asked by Chris Adison on April 24, 2008
  9. chem

    Next step, multiply both sides by (.01-x) .012(.01-x)=.01x+x^2 gather terms, put in standard binomial form, use the quadratic equation, and solve for x. is the standard binomial x^2+.022x-1.2x10^-4

    asked by lyne on March 26, 2008
  10. Quadratic Equations

    The height of an object projected upward from ground level is given by h=-16t squared + 128t. When will the object be 240 feet above the ground? (Please provide steps/explanation to solve this problem.)

    asked by purpletree on March 29, 2009
  11. Chemistry

    Please help me solve this question: A layer of peat beneath the glacial sediments of the last ice age had a carbon-14 content of 25% of that found in living organisms. How long ago was this ice age?

    asked by Mon on March 22, 2013
  12. Math topic part 2

    18. Complete the table. a 5 6 7 8 9 b 3.8 4.6 5.4 (2 points) Essay: 9.39 and 10.6 i did 5.4 divided by 7 times 8 and i received thees answers 1 /2 points I like that you figured out the rule first. Remember, when finding the rule, you want to determine

    asked by Newscapepro on May 26, 2016
  13. Math help practice test

    Harvey has 3 pets. On Monday she uses d cans of pet food. On Tuesday she used 6 cans and wed thurs fri she uses 4 cans each day. How many cans does she use during these 3 days. Which number is not needed to solve this problem. 4 3 5 6 And why?

    asked by Daniel on May 13, 2014
  14. Math

    barbara can walk 3200 meters in 24 minutes.Mavis can walk 11,808 feet in 24 minutes.Who walks at a faster rate of speed?Explain the steps you take to solve the problem.

    asked by Mina on March 27, 2018
  15. Math - Geometric Vectors

    Find the length and the direction of the resultant of each of the following systems of forces: a) forces of 3 N and 8 N acting at an angle of 60° to each other I'm completely lost. I don't know how to solve this question using geometric vectors. Please

    asked by Anonymous on February 17, 2008
  16. Algebra

    Solve by using the quadratic formula x^2=-7x+12 First, put all the terms on one side. x^2=-7x+12 x^2 + 7x -12 = 0 If the original sign for the 12 were negative, this would lead you to: x^2 + 7x + 12 = 0 This could factor into: (x+3)(x+4) = 0 However, as

    asked by PLEASE HELP on July 12, 2007
  17. Geometry

    I am doing 7th grade algebra, and my homework is due by 9:00 and I don't know how to solve this question: Find the measures of supplementary angles 1 and 2 if, A) m angle 1 is less than m angle 2 by 40 degrees B) m angle 1:m angle 2=5:4 Please help soon my

    asked by Ava on September 24, 2016
  18. Roots, complex numbers

    I want to solve z^5=-1 But all the examples I've seen use positive numbers. The -1 is throwing me off somewhat. Most of the examples I've worked with would be solved using the polar form I.e Z^5(cos5+i sin5)=1(cospi +i sinpi) But as I said negative numbers

    asked by Mrbob on April 25, 2016
  19. alg2/trig

    I got this question wrong on my test, and I have to correct it :/ How many permutations are there of all the letters in the word "TEXAS" ? The answer to this part is 120, but I have no idea on how to solve the second part without having to write it all

    asked by Chris on April 1, 2009
  20. precalculus

    Use a Double- or Half-Angle Formula to solve the equation in the interval [0, 2π). (Enter your answers as a comma-separated list. Round your answers to three decimal places where appropriate.) sin 2θ + sin θ = 0

    asked by Ama on October 28, 2012
  21. Math

    Tiny scored 94, 68 and 88 on her first 3 Algebra 1 tests. Her next test is her final which counts as double. Write and solve an equation that Tina could use to determine the minimum grade she must score on her final to have a mean score of 80.

    asked by Reanah on November 17, 2016
  22. Calculus I

    The 8-ft wall shown here stands 27 ft from the building. Find the lenght of the shortest straight beam that will reach to tthe side of the building from the ground outside the wall. ANSWER 46.87ft How do i solve???

    asked by Anonymous on November 28, 2007
  23. health care

    Hello, I really need help in revising this paper. hope to receive help from someone soon. Thank you. The US Institute of Medicine defines quality as the "degree to which health services for individuals and populations increase the likelihood of desired

    asked by Rimmy on April 4, 2009
  24. mat115

    Need assistance with this problem. I have computed the problem but my answer isn't matching one of the multiple choices. What am I doing wrong? 11-6 ____ 7-7 11 - 7 = 4 4 - 6/7 = 3 + 7/7 - 6/7 =3 1/7 which is the same as 22/7 the multiple choices on my

    asked by adore001 on August 26, 2010
  25. Algebra

    What type of graph does not show the number of times a response was given? A.box-and-whisker plot B.line plot C.stem-and-leaf plot D.bar graph I think it is a bar graph/D

    asked by Cassie on March 4, 2013
  26. English

    I need an attention grabber for my essay about comparing 2 genres of media, a TV news show and a gossip website. Can anyone help me with an attention grabber, I've basically written the whole essay already I just need a really good attention grabber... Any

    asked by Jasmine on February 25, 2009
  27. Jimmie

    I am nearly done with my Red Badge of Courage Analysis, but I would prefer one more thought from someone other than me. If you have read the work, could you tell me what you think Crane felt about soldiers as individuals? I think he thought they were

    asked by Laura on October 6, 2007
  28. Physics

    In 1989, Carl Lewis established a world record when he ran the 100 meter dash in 9.92 seconds. What was his average speed(in m/s) for the race? Remember to include your data, equation, and work when solving this problem. I am not sure how to do this

    asked by Jake on March 29, 2009
  29. physics

    A uniform rectangular marble slab is 3.4m and 2.0m wide.it has a mass of 180kg.its originally lying on surface flat ground with It's 3.4m*2.0m surface facing up.How much work is needed to stand it on It's short end?(hint,think about its centre of gravity)

    asked by sarah Basheer zubair on February 16, 2017
  30. Anthropology

    Suppose two populations come into contact. As organisms will do, they find some attractive members of the opposite sex and interbreed. The populations have now exchanged genes. The next generation produces several children with new traits. What

    asked by Anonymous on May 19, 2016
  31. Chemistry

    I havent been at school for 8 days due to somthing wrong with my heart, but the teachers gave me work. I have no clue how to do them. I really need help please, There all due tomarrow. Determine the pressure inside a televison picture tube with a volume of

    asked by Help please on April 5, 2010
  32. HRM can u tell me if i am correct

    Describe in one or two sentences how you will access job analysis and job description information for your selected position. mine is an elementary school teacher. Would it be ok to write about the tasks, knowledge, skills, abilities, interests, and work

    asked by scooby9132002 on September 18, 2009
  33. physics:energy

    A car (mass 920 kg) drives up a hill (height 328 m) in 143 seconds. At the bottom of the hill, it has a speed of 24 m/s, but at the top, it has slowed down to 14 m/s. Neglecting friction, what is the average engine power? I tried using 1/2mv^2 and it

    asked by Ashley on October 31, 2010
  34. english

    Do as shown... 1) she left the house.her mobile phone rang (no sooner) 2) marina talked to her mete during the break (while) 3)he had no sooner set the table than the guests arrives (hardly) 4)she remembered her old friend.she knew him before (because)

    asked by kalbaz on October 20, 2009
  35. Analyzing arguments

    What is the difference between an unsound argument and an invalid argument? http://www.wisegeek.com/in-logic-what-are-sound-and-valid-arguments.htm Let us know if you need further help. =) i want to mary you my phone number is : 8551234 i am a sexy girl

    asked by Larissa on July 3, 2006
  36. Calc

    Calculate the area bounded by the x-axis and the function f(x)= -(x-a)(x-b), where a

    asked by Tezuka on November 27, 2006
  37. History

    The Supreme Court's decision in Plessy v. Furguson (1896): Select one: a. Was a unanimous decision b. Sanctioned racial segregation c. Voided (undid) the Thirteenth Amendment to the Consititution d. Limited the hours that women could legally work. I think

    asked by TayB on February 25, 2015
  38. social psychology

    Is this one the few ways to obtain self-efficacy? I also feel that self efficacy can occur in oneself as well as others from charity or volunteer work and spiritual activities such as attending temple or church and reading religious texts. Yoga,

    asked by Sharon on August 22, 2011
  39. factoring

    let f(m)=m^3 + 3m^2 + 3m + 1 notice f(-1) = 0, so m+1 is a factor. Using division, the answer is m^2 + 2m + 1 which factors once more to (m+1)(m+1) so you have (m+1)^3 = 0 and then m = -1 Are you familiar with Pascal's triangle? Did you notice the pattern

    asked by Reiny on March 11, 2007
  40. english

    According to the strategies discussed in the lesson, when you have trouble making sense of what you have read, what is one strategy you can use? Share thoughts and questions with friends. Try not to overthink the problems you have. Read the same material

    asked by oscar on September 5, 2015
  41. Physics

    I believe I've done this right A penguin sildes 1.5 m/s across the ice on her belly. The coefficient of kinetic friction is .02 How far will she slide before stopping? I do not need to see the work to this problem just need to know if I did it right. I got

    asked by Kate on January 5, 2010
  42. QUESTION--Please Help

    What,if anything,is wrong with this sentence? Do you advise me to go to college or that I should get a job after high school? A. Properly constructed sentence B. Misplaced part C. Lacks parallel parts D. Run-on I think the answer is C, am I CORRECT? Joyce,

    asked by Joyce on October 19, 2006
  43. english

    Which of the following topics relate directly to a work's authenticity? 1)believability of characters 2)the appeal of a certain guitar riff 3)sincerity expressed in a love song 4)the likely appeal to all teenagers 5)the way the setting matches the mood of

    asked by danny on November 1, 2010
  44. Math

    What do we have for home work, 6th grade MR. Saccatello? october 17, 2006 People who read this message board live all over the country and have no way of knowing assignments in individual schools. Please contact your teacher or another student in your

    asked by Rae Rae on October 17, 2006
  45. w.g

    ship breakers wreck old ships in order to: A)create a light industry B)provide work gor unemployed city residents C)**assist cottage industries D)recycle iron and steel i think that's it but i really think is for them to know whose ship is whose but that's

    asked by henry on September 24, 2009
  46. Business

    If the research question were defined as “will buyers purchase more of a product in a blue colored or silver package?” the most appropriate type of research would be A. exploratory B. descriptive C. causal D. associative E. none of the above I chose E

    asked by Steve on January 15, 2011
  47. physics

    Starting from rest, a 4.4 kg block slides 3.5 m down a rough 22.3o incline in 2.4 seconds. Determine the energy lost due to friction. (Hint: find the final kinetic energy and subtract that from the work done by gravity.) Enter your answer here: J

    asked by em on May 4, 2011
  48. english

    Inthe short story ''the guest'' what does this quote mean ''...dirty white snow...''(Camus 9) Explain the quote interms of the figurative device. what is the theme? How does it connect to human nature? pls i really need your help. this work is due tomorow

    asked by ted on February 14, 2011
  49. Physics

    An airplane whose speed is 150km/hr climbs from a runway at an angle of 20° above the horizontal. What is its altitude two minutes after takeoff? How many kilometers does it travel in a horizontal direction during this two minute period? My work:

    asked by Anonymous on October 10, 2014
  50. physics

    Ice fishing equipment weighing 3,000 N is pulled at a constant speed V = 0.5 m/s across a frozen lake by means of a horizontal rope. If the coefficient of kinetic friction is 0.05, what is the work done (in J) by the fisherman in pulling the equipment a

    asked by Drew on October 3, 2012
  51. Art

    I need an idea. I am supposed to create an artwork in the style of Isamu Noguchi. Based specifically on his work "Monument to Heroes". The only thing I can think of was to put holes in a box and paint it yellow. Hence, cheese. But this doesn't seem to be

    asked by Anonymous on May 10, 2008
  52. English-Speech

    I am workng on my introduction part of my speech and here is my transition sentence: With my voice, I can make a difference in 5 different ways. Would these be like the examples of the "5 different ways" ? preventing people from doing a bad action, helping

    asked by Emma on December 1, 2012
  53. culturally diverse

    Young children's functional use of language within a work context is often observed in... a. mainstream industrialized societies b. triadic interactions in Mexico-American group c. rural Appalachian Black communities d, Native American cultures

    asked by katrina on December 29, 2013
  54. Physics

    An X-ray binary consists of 2 stars with masses m1 (the accreting compact object) and m2 (the donor). The orbits are circular with radii r1 and r2 centered on the center of mass. (a) Find the orbital period T of the binary following the guidelines given in

    asked by jennifer on November 24, 2013
  55. Science

    1) How does the pH of a solution affect its solubility and structure of weak organic acids and bases, such as proteins and nucleic acids? 2) Why would a zipper or a Velcro strip be a good analogy to weak interactions between biological molecules? Thank

    asked by Tenshi on February 10, 2017
  56. calculus

    Please help with this very complicated question! Using 3(x-3)(x^2-6x+23)^1/2, as the chain rule fifferentiation of f(x)=(x^2-6x+23). Please explain how I find the general solution to dy/dx= 2/27(x-3)SQUARE ROOT BEGINS (x^2-6x+23)/y SQUARE ROOT ENDS (y>0),

    asked by Amy on April 18, 2011
  57. Chemistry

    What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 mL of 0.24 M calcium chloride? Also, Calculate the concentrations of each ion remaining in solution after precipitation is complete. Cl ‾ NO3‾

    asked by Ashley on June 21, 2013
  58. biology

    If iodine and water are mixed together and form a clear yellow solution and then cornstarch is added to iodine and form a dark brown color, what is the signifigance of the two different colors? Which one showed a positive presence of a sugar?

    asked by astrid on November 20, 2008
  59. chemistry

    if Maalox is mixed with 40ml of 0.1 M HCI and isn't neutralized, how much extra help with this antacid pill need to neutralize 40ml of 0.1 M HCL by adding 0.05 M NaOH drop by drop to back-tritrate the solution until the pH is neutral?

    asked by Tamy on September 26, 2008
  60. Chemistry

    Using the activity series (Table 4.5), write balanced chemical equations for the following reactions. If no reaction occurs, simply write No Reaction. Chromium metal is immersed in an aqueous solution of cobalt(II) chloride.

    asked by Thomas on February 26, 2019
  61. Lab Math

    A stock solution of inulin has a concentration of 500mg/ml. From this stock 0.50ml is diluted with 0.50ml of sterile saline. After 30 min blood is sampled and produces a result of 50ug/ml. What is total extravascular volume?

    asked by Amy on September 6, 2017
  62. st anns

    from linear equation if the total bill of a house in delhi is rs 4000 for a month assuming that the consumption is x units as per delhi tariff slabs shown in the actual bill math otba solution

    asked by faisal on April 2, 2016
  63. Chemistry

    A 0.3146-g sample of a mixture of NaCl(s) and KBr(s) was dissolved in water. The resulting solution required 37.20 mL of 0.08765 M AgNO3(aq) to precipitate the Cl–(aq) and Br–(aq) as AgCl(s) and AgBr(s). Calculate the mass percentage of NaCl(s) in the

    asked by Woof on November 30, 2017
  64. Math: matrices

    If A and B are both square n x n matrices, If AB = I, prove BA = I Presumably you have to do this without using the usual properties of the inverse of matrices. But we do need to use that if there exists a matrix B such that A B = I then the equation A X =

    asked by mathstudent on December 4, 2006
  65. Chemistry

    A sample of solid monoprotic acid with molar mass equal to 137.9 g/mol was titrated with 0.1879 M sodium hydroxide solution. Calculate the mass in grams of acid to be used if the volume of NaOH to be used is 25 mL.

    asked by Raj on October 8, 2007
  66. chemistry

    URGENT!!! How many grams of sodium benzoate (NaC6H5CO2) must be added to 500 mL of 0.15 M benzoic acid (HC6H5CO2) to make a buffer solution with pH of 5.0? Assume no volume change upon sodium benzoate dissolution. Ka = 6.46 x 10-5 How would I go about this

    asked by Rainbow on March 26, 2014
  67. chemistry

    A student mixed 75.0 mL of water containing 0.75 mol HCl at 25�C with 75.0 mL of water containing 0.75 mol of NaOH at 25�C in a foam cup calorimeter. The temperature of the resulting solution increased to 35�C. How much heat in kilojoules was

    asked by Alexis on February 7, 2012
  68. chemistry

    Faraday¡¯s Law of Electrolysis • Practice Problem. • What is the oxidation state of the osmium atom in an unknown salt if 26.7 grams of osmium plate out when a current of 15 amps is passed through a solution of this salt for 1 hour?

    asked by Jin on July 27, 2010
  69. Chemistry

    for each of the following acid-base reactions calculate the mass (in grams) of each acid necessary to completely react with and neutralize 4.85g of the base solution 1)2HNO3(aq)+ Ca(OH)2 (aq)> 2h20(l)+ Ca(NO3)2 2) H2SO4(aq)+ 2KOH(aq)---> 2H2O(l)+ K2SO4

    asked by Mark on September 22, 2015
  70. Chemistry help

    What mass of silver chloride can be prepared by the reaction of 160.0 mL of 0.26 M silver nitrate with 150.0 mL of 0.24 M calcium chloride? Also, Calculate the concentrations of each ion remaining in solution after precipitation is complete. Cl ‾ NO3‾

    asked by Ashley on June 21, 2013
  71. chemistry

    3.0g of a mixture of potassium carbonate and potassium chloride were dissolved in a 250cm3 standard flask. 25cm3 of this solution required 40.00cm3 of 0.01M HCl for neutralization. What is the percentage by weight of K2CO3 in the mixture? (K = 39, O = 16,

    asked by kelly on June 28, 2018
  72. chemistry

    3.0g of a mixture of potassium carbonate and potassium chloride were dissolve in a 250cm standard flask. 25cm of this solution required 40.00cm of 0.01mole HCl for neutralization what is the percentage by weight of K2Co3 in the mixture?

    asked by CEO on June 23, 2019
  73. ap chem

    i am stuck on this problem from school A solution is made by mixing 30.0 mL of toluene C6H5CH3d=0.867gmL with 130.0 mL of benzene C6H6d=0.874gmL . Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are

    asked by ted on August 8, 2008
  74. Chemistry #17

    When a 5.00g sample of KBr is dissolved in water in a calorimeter that has a total heat capacity of 3.982 kJ-K, the temperature decreases by .210 K. Calculate the molar heat of solution of KBr. =____kJ/mol

    asked by Chelsea on October 28, 2013
  75. Chemistry

    At –10.00 °C (a common temperature for household freezers), what is the maximum mass of fructose (C6H12O6) you can add to 1.00 kg of pure water and still have the solution freeze? Assume that fructose is a molecular solid and does not ionize when it

    asked by Heather on February 21, 2012
  76. Linear Algebra

    Let L be the line with parametric equations x = 1−2t y = 3+3t z = −1−3t Find the shortest distance d from the point P0=(1, −4, −2) to L, and the point Q on L that is closest to P0. Use the square root symbol '√' where needed to give an exact

    asked by Ramit Rana on November 29, 2016
  77. chemistry

    How would you do this question: A student dissolved 5.0 g of vitamin C in 250 mL of water. The molar mass of ascorbic acid is 176 g/mol, and its Ka is 8.0 × 10−5. Calculate the pH of the solution. Note: Abbreviate the formula of ascorbic acid to HAsc.

    asked by Q on June 7, 2014
  78. Chemistry

    A 0.3146-g sample of a mixture of NaCl(s) and KBr(s) was dissolved in water. The resulting solution required 47.40 mL of 0.08765 M AgNO3(aq) to precipitate the Cl–(aq) and Br–(aq) as AgCl(s) and AgBr(s). Calculate the mass percentage of NaCl(s) in the

    asked by DeJanee on October 1, 2013
  79. Chemistry

    Consider the titration of 100.0 mL of 0.260 M propanoic acid (Ka = 1.310−5) with 0.130 M KOH. Calculate the pH of the resulting solution after each of the following volumes of KOH has been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b)

    asked by Margaret on March 13, 2013
  80. Math

    Use inverse trigonometric functions to find a solution to the equation in the given interval. Then find solutions? cos x = -0.6 , 0

    asked by George on November 8, 2014
  81. chemistry... HELPP

    Pyridine is a weak base that is used in the manufacture of pesticides and plastic resins. It is also a component of cigarette smoke. Pyridine ionizes in water as follows: C5H5N + H2OC5H5NH+ + OH- The pKb of pyridine is 8.75. What is the pH of a 0.190 M

    asked by joane on November 30, 2012
  82. Chem

    Which of the following salts is water soluble? AlCl3, Li2SO4, BaC2O4, NaF, NiS, FeBr2, (NH4)2CO3, Zn(NO3)2, Na3PO4, Mg(OH)2, Ca(CH3CO2)2. Also specify the concentration of each ion in solution for the following: .10 M AlCl3 (aq) and .15 M (NH4)2SO4 (aq)

    asked by Erin on February 12, 2017
  83. Chemistry

    A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you

    asked by Matthew on January 24, 2009
  84. Algebra

    The jaguars basketball team was down 21 points at halftime. In the second half, they started to catch up at a rate of 2 points per minute. The inequality below can be solved to determine the number of minutes it took the jaguars to take the lead. -21+2m>0

    asked by Chloe on January 19, 2017
  85. Organic Chem

    What is the product formed from the nitration of 1,2-dimethoxybenzene ( veratrole)? What would be the equation for the reaction. Details. Veratrole was mixed with glacial acetic acid.This mixture was then added dropwise to a solution of nitric acid and

    asked by Niki on March 2, 2010
  86. chemistry

    6.0g of impure and hydrous Na2SO4 were made up to 1dm^3 of solution neutralize 22.20cm^3 of 0.1mol/dm^3 of HCL.calculate: a)concentration of Na2CO3 in mol/dm^3. b)concentration of Na2CO3 in gram/dm^3. c)percentage purity in carbon.

    asked by faith on January 28, 2012
  87. Chemistry

    Suppose that a 0.6123-g unknown chloride-containing sample was dissolved, and and AgCl precipitated by adding a AgNO3 solution. The precipitate was filtered, ignited, and found to weigh 0.3324 g. What was the percent chloride in the unknown?

    asked by Anonymous on October 26, 2011
  88. Chemistry repost

    A student determined that ethanol was the best solvent to use for a recrystallization based on small scale trials. When the recrystallization was carried out on a larger scale, no crystals were obtained on cooling the hot solution. Why? and how would you

    asked by Matt on January 25, 2009
  89. chemistry

    Prepare 150 ml of a reaction buffer containing 0.75% MgCl2, 35mM glucose, 750 nM ATP, and 20 mM Tris-Cl, pH 7.5. In addition, you have a 20% MgCl2 stock solution and the lab freezer has 10 mM ATP that you can dilute to the correct concentration.

    asked by steven on September 25, 2012
  90. Chemistry

    If a .01M Mn(NO3)2 solution has an ammonia concentration of 6M, would a precipitate form? Calculate the ion product and compare to Ksp. I'm way too confused. I'm pretty sure a precipitate would form so I set up an ice table but don't know where to go from

    asked by Juliana on November 6, 2012
  91. College Chemistry

    calculate the average volume of sodium hydroxide required for the titration of 25.00mL of the standard sulfuric acid solution. From my data i have trial 1 and 2 to be 19.80ml and 19.80ml of NaOH used so do i just add them and divide it by two to get the

    asked by Anonymous on September 28, 2012
  92. Physics

    A body of mass 2kg, moving at 3ms-¹ on a rough horizontal floor is brought to rest after sliding through a distance of 2.5m on the floor. Calculate the coefficient of sliding friction (g=10ms-²). Please I need the full solution.

    asked by Sadiya on February 9, 2018
  93. chemistry

    6.0g of impure and hydrous Na2SO4 were made up to 1dm^3 of solution neutralize 22.20cm^3 of 0.1mol/dm^3 of HCL.calculate: a)concentration of Na2CO3 in mol/dm^3. b)concentration of Na2CO3 in gram/dm^3. c)percentage purity in carbon.

    asked by faith on January 28, 2012
  94. physics (work posted)

    For a body to be in equilibrium under the combined action of several forces. a) all the forces must be applied at the same point b) all of the forces form pairs of equal and opposite forces c) the sum of the components of all the forces in any direction

    asked by Diane on December 10, 2006
  95. physics

    When a ball falls down from a height h, its P.E is transformed into K.E as it's free-falling, BUT..... wot abt objects not falling freely? So... What happens to the potential energy of an aeroplane when it lands, does it change to K.E (well it already has

    asked by Mike on June 29, 2005
  96. Social Studies

    What prompted the establishment of the Articles of Confederation? States needed to be sure that they maintained control over their land. Colonies wanted to show Britain that they were an organized union.***** Delegates thought that the colonies needed to

    asked by Snow on September 12, 2017
  97. Math

    Label picked up 105 pieces of trash on Beach Cleanup day day.what did she write to show the 0 in 105 using expanded form? The fence around a triangular flower bed is 10 feet long on all sides. What type of triangle does the fence form?

    asked by Nawaf on December 8, 2013
  98. in chem

    calculate the mass of this sample: 1.05 * 10 to the power of 26 atoms of neon, Ne(g) I know that I have to first divide by the avagadros constant, then once get the moles I need to multiply by the molar mass of neon to get the grams, I did that sevral

    asked by Help on December 24, 2012
  99. math problem

    You are going to drive 480 miles today at an average speed of 60 miles per hour. Thus you are going to drive for a total of 8 hours. The diameter of the wheels on your car (including tires) is 25 inches. Thus each wheel is going to turn a total of ___

    asked by carol on September 23, 2010
  100. Physics

    A car can decelerate at -4.80 m/s^2 without skidding when coming to rest on a level road. What would its deceleration be if the road were inclined at 13 degrees uphill? Assume the same static friction force. Supposively the answer is -7.00 m/s^2 but I keep

    asked by Jake on December 21, 2009

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