1. Calculus

    A small aircraft starts its descent from an altitude of 1 mile, 4 miles west of the runway. a) Find the cubic f(x) = ax3 + bx2 + cx + d on the interval [-4,0] that describes a smooth glide path for the landing. b) If the glide path of the plane is

    asked by Jon on December 3, 2007
  2. Physiology

    Suppose a salt and a glucose solution are separated by a membrane that is permeable to water but not to the solutes. The NaCl solution has a concentration of 1.95 g per 250 mL (molecular weight = 58.5). The glucose solution has a concentration of 9.0 g per

    asked by ivy on May 14, 2011
  3. chemistry

    1.000 g of bronze was dissolved in the mixture of acids. The solution was transferred into 100 ml volumetric flask and filled to the mark. 10 ml aliquote of this solution was transferred into another 100 ml flask and diluted to the mark. 10 ml of the

    asked by EMEKA on September 16, 2016
  4. Chemistry

    You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of

    asked by Jack on November 14, 2015
  5. chemistry

    You have a 250ml solution of 0.13M calcium iodate. How many grams of potassium iodate need to be added to the solution to begin to precipitate calcium iodate? The solubility product constant for calcium iodate is6.47 *10^-6. B) you have a 250ml solution of

    asked by anonymous on November 18, 2015
  6. physics

    A net external force is applied to a 13 kg object that is initially at rest. The graph to the left shows net force component along the displacement of the object as it varies with displacement. 1) What is the work done between 0 m and 4 m? 2. What is the

    asked by Anonymous on October 5, 2013
  7. math,algebra

    Use the five properties of exponents to simplify each of the following expressions (y^5)^3(y^3)^2 divided by (y^4)^4 can someone show me how to solve these types of problems (y^5)^3= y^15 multiply the powers (y^3)^2=y^6 multiply the powers again as you

    asked by jasmine20 on January 21, 2007
  8. math

    marcus aaron and jason went to a double feature movie. the show began at 1.45 pm and lasted for 4hrs and 27mins. at what time did the show end? would it be 6.14pm Close, just add again. 6.27pm Nope :) After 4 hours it is 5:45. 15 minutes later it is 6:00.

    asked by ciera on January 23, 2007
  9. Algebra I

    I'm stuck on this problem please help me find the range of this equation y = (x^2 - 4)/(x^2 - x - 12) I know that it is [1/3,-infintiy]U[?,infinity] yes I'm having trouble with that ? At first I was like ok there should be a horizontal asymptote at y=1

    asked by Kate on July 23, 2010
  10. Math

    Ronald need to earn at least Php 2,500 from his two jobs to cover his weekly expenses.This week,he can work for at most 42 hours.His job as a gas station attendant pays Php 52.50 per hour while his job as parking attendant pays Php 40 per hour. A. Write a

    asked by Claire on September 13, 2017
  11. phsyics

    A cart of mass M1 = 6 kg is attached to a block of mass M2 = 3 kg by a string that passes over a frictionless pulley. The system is initially at rest and the table is frictionless. After the block has fallen a distance h = 1 m: What is the work Ws done on

    asked by Jamila on March 27, 2006
  12. Chemistry

    how many moles of Na2C2O4 are there in 25.00 mL of a .7654 M solution of sodium oxalate? 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

    asked by NEED ASAP FOR TOM MORNING!! PLZ HELP!!! on March 3, 2009
  13. College Chemistry Lab

    The absorbance of a 6.3x10^-5M solution of an iron complex was measured to be 0.328 at the optimum wavelength. A second solution of the iron complex has an absorbance of 0.833 measured under identical conditions. What is the molarity of the complex in the

    asked by L** on March 15, 2010
  14. Chemistry

    100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of

    asked by Hannah on March 23, 2015
  15. math

    8. Of the 180 students who took part in the Race for Hunger, about 5/8 were sophomores. Of the sophomores, 40% were girls. How many sophomore girls took part in the race? A.35 girls B.125 girls C.45 girls D.72 girls please explain and show work

    asked by Johnny on July 3, 2014
  16. Algebra 2 grade 11

    Write a prediction line (equation of line of best fit) for the points in the table: x 2 4 6 y 7 13 19 Show all work! List points then write an equation in y = mx+b form. Use the prediction equation to predict the y value for x = 25.

    asked by Anonymous on October 23, 2018
  17. math

    ben saved 1 penny on january 1, 2 pennies on january 2, 4 pennies on january 3, and 8 pennies on january 4. if ben continues to increase his saving at this rate, when will he have saved a total of $10 or more? show your work

    asked by Anonymous on April 12, 2012
  18. math

    here is a riddle: As i was going to Halifax, I met a man with 7 sacks, Every sack had seven cats, Every cats had 7 kits, Man,kits,cats , and sacks were going to Halifax? how many kittens were there? show your work by using powers.

    asked by PLEASE HELP ME! on September 15, 2009
  19. Math

    Martin you some apples to make muffins Omar use some apples to make applesauce Omar used five fewer than half as many apples as Martin use? Could Martin has used 10 apples why or why not use expression to help you decide show your work. I need help

    asked by Olivia on February 25, 2019
  20. Physics PLEASE

    I'm trying to solve this problem Calculate (a) how long it took King Kong to fall straight down form the top of the Empire State Building (380 m high), and (b) his velocity just before "landing". My teacher said try and rearagne this equation for t X = Xo

    asked by Physics PLEASE on June 23, 2009
  21. Math

    Went ahead and did the HW the teach recommended but she did not post the answers and I would like to see if im on the right track. Problem 1: Are the vectors (2,−1,−3), (3, 0,−2), (1, 1,−4) linearly independent? Problem 2 : Is the set {x E R^4 :

    asked by John Rose on May 11, 2013
  22. Physics

    A parachutist with mass 79.7 kg jumps from an airplane traveling at a speed vi= 112 km/hr at a height H = 2570 m. He lands with a speed of vf = 5.21 m/s. What is the change in mechanical energy (J) of the earth- parachutist system from just after the jump

    asked by Casey on June 18, 2011
  23. Literature

    i have to write an evaluative essay on a work of literature. i have chosen Hiroshima; The Noiseless Flash. in this essay i will write my own statement about the value of a work of literature ( ? ) and then provide reasons why your evalutation is correct

    asked by Bella on February 5, 2009
  24. Physics - Verification

    A skier (75 kg) goes down a 15* slope. The coefficient of kinetic friction between the skis and the snow is 0.185. The length of the slope is of 500m. a) What is the work done by gravity? Answer) Wmg = mgd = 75kg(9.8N/kg)500m(sin15) = 354 977 J Is it cos

    asked by Raf on February 6, 2012
  25. Art

    an environment artist created a piece in protest of trash. Anticipation negative public reaction, the artist decided to display the work anyway. what is the most likely reason? A. The artist believed that the purpose of the work was to stir up awareness B.

    asked by Vanessa on February 5, 2016
  26. algebra (HELP)

    Show all work. No decimal answers, except in problem 6. Simplify: 5^0a^6b^3 (-4)^-1 (2a^4y^3)^3 ()-2 Simplify the expression. Write your answer in scientific notation. (4 x 108)(8.2 x 10-2) The amount of bacteria in a raw piece of meat doubles every 3

    asked by heyitslizzz on February 21, 2019
  27. chemistry

    given 2CH3OH+3O2->2CO2+4H2O 1. Calculate number of grams of CH3OH required to react with 34.0L of O2 at STP. 2. How many liters of CO2 at 18 degrees Celcius and 6.94 atm are produced when 3.40 mol of CH3Oh is burned completely. 3. What volume of CO2 is

    asked by sheila on November 13, 2012
  28. language

    1.which factor is most helpful in helping technology to progress? a) unintended consequences b) a better understanding of the natural world c) risk-benefit analysis d)obsolete technologies 2. an oven is a technological system. which of the following

    asked by victoria on September 24, 2013
  29. algebra

    Essay; show all work. Consider that the age, x, of a unicorn in human equivalent years can be given by the formula f(x) = - 0.001518x4 + 0.097326x3 – 1.3367x2 + 12.46x + 2.914. When a unicorn is 2.5 years old, what is its age in human equivalent years?

    asked by joel on May 31, 2011
  30. algebra

    Essay; show all work. Consider that the age, x, of a unicorn in human equivalent years can be given by the formula f(x) = - 0.011718x4 + 0.187326x3 – 1.3367x2 + 12.46x + 2.914. When a unicorn is 2.5 years old, what is its age in human equivalent years?

    asked by joe hahira on March 7, 2011
  31. math

    The figure below is not drawn to scale. The ratio of the area of triangle ABC to the area of triangle DEC to the area of triangle FGH is 7 : 5 :3. If 20% of the area of triangle DEC is shaded, what percentage of the figure is unshaded? PLEASE SHOW ALL YOUR

    asked by lillyyy on July 31, 2018
  32. Alg2

    The tangent to a circle may be defined as the line that intersects the circle in a single point, called the point of tangency. If the equation of the circle is x^2 + y^2 = r^2 and the equation of the tangent line is y = mx + b, show r^2(1 + m^2) = b^2

    asked by Allen on October 22, 2009
  33. Direct way to improve yield of ball mill

    The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided

    asked by selina on June 13, 2013
  34. algebra 1

    can someone show me how to solve the equation x2 + 9x = -14. add 14 to each side. Factor, try 2,7 as factors. add 14 to each side. Factor, try 2,7 as factors.

    asked by mike on July 8, 2007
  35. physics

    Two blocks are connected by a very light string passing over a massless and frictionless pulley (the figure ). Traveling at constant speed, the 20.0- block moves 70.0 to the right and the 12.0- block moves 70.0 downward.During this process, how much work

    asked by john on July 1, 2010
  36. Chemistry

    Cadmium and a solution of cadmium(II) nitrate are used with tin and a solution of tin(II) nitrate to construct a galvanic cell. 1) The reaction run initially at standard state with 100-mL samples of each solution is allowed to proceed until 8.0 g of tin

    asked by chamy on April 29, 2012
  37. Chemistry

    A reaction mixture of 4.0 mL of 0.002 M SCN- and 5.0 mL of 0.002 M Fe3+ is diluted to 10.0 mL with 0.1 M HNO3 to form the blood-red FeNCS2+ complex. The equilibrium molar concentration of the FeNCS2+ determined from a standardization curve is 1.5x10^-4

    asked by Anonymous on March 18, 2013
  38. chemistry

    A reaction mixture of 4.0 mL of 0.002 M SCN- and 5.0 mL of 0.002 M Fe3+ is diluted to 10.0 mL with 0.1 M HNO3 to form the blood-red FeNCS2+ complex. The equilibrium molar concentration of the FeNCS2+ determined from a standardization curve is 1.5x10^-4

    asked by Anonymous on October 13, 2015
  39. science

    What would a counter-example be in math? a.an example that proves the conjecture wrong b.an example to show the formula is wrong c.a very nice granite kitchen-top surface d.an example to show the conjecture is true

    asked by Ros on September 12, 2010
  40. calculus

    The efficiency of an internal combustion engine is given by E= (1-v/V)^0.4 Where V and v are the respective maximum and minimum volumes of air in each cylinder. a) Show that ∂E/ ∂V > 0 and interpret your result b) Show that ∂E/ ∂v < 0 and interpret

    asked by help on March 11, 2012
  41. calculus

    The efficiency of an internal combustion engine is given by E= (1-v/V)^0.4 Where V and v are the respective maximum and minimum volumes of air in each cylinder. a) Show that ∂E/ ∂V > 0 and interpret your result b) Show that ∂E/ ∂v < 0 and interpret

    asked by wei on March 12, 2012
  42. American Government

    Why is it easier for the prime minister of Britain to pass legislation than it is for the U.S. president? * The United Kingdom is a federal system where the prime minister is chosen by the British queen. This provides the prime minister the opportunity to

    asked by Becky on October 10, 2016
  43. math

    John bought a rectangular door mat that was a half meter long and 3 tenths meter wide.How do I show a visual model to show the area of the mat?

    asked by zion on March 3, 2014
  44. Calculus

    Show how the function y = e^(-x) sin x could represent damped oscillation. a) Determine the local extreme for a sequence of wavelengths. b) Show that the local maxima represent exponential decay.

    asked by Connie wong on June 1, 2017
  45. Science

    I am supposed to write a brief paragraph after watching a certain show (which I did), but in it, I am supposed to include if I found the show interesting, what I learned that fascinated me the most, and what program I would create for the series. How can I

    asked by scienceperson on August 23, 2010
  46. Accounting

    Lock boxes Anne teak, The finanicial manager of the furniture manufactures, is considering operating a lock box system. she forcasts that 400 payments a day will be made to lock boxes with an average payment size of $2000. The bank charge for operating the

    asked by Neena on June 26, 2006
  47. Chem

    If a precipitation reaction occurs, when a solution of one substance is added to a solution of the other, enter the formula and state of the spectator ions. Separate by comma. If there is no reaction, enter the formula and state of all ions in solution.

    asked by Keri on February 18, 2010
  48. Chemistry DrBob

    You told me the steps on a previous post but i must have forgot how to work out absorbance or ICE cus i keep getting the wrong answer ... 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

    asked by Amy on April 10, 2008
  49. chemistry

    Two naturally occurring isotopes exist for the hypothetical element dippium. 25.0 percent of dippium atoms have a relative mass of 17.0 amu and 75.0 percent a relative mass of 21.3 amu. What is the atomic mass of dippium? Please show the work thanks

    asked by Lisa on February 4, 2014
  50. Algebra

    Can you please check my answer: Solve the problem. A person with no more than $4000 to invest plans to place the money in two investments, telecommunications and pharmaceuticals. The telecommunications investment is to be no more than 3 times the

    asked by Soly on November 17, 2007
  51. English

    Combine these two simple sentences into a complex sentence. Many industrialized nations use the metric system. The United States refuses to adopt it. A. Although many industrialized nations use the metric system, the United States refuses to adopt it. B.

    asked by Jim on November 22, 2015
  52. Solar Energy Please Help

    a) Family Smith has already installed PV in their house. Now, they also want to cover their needs for warm water with solar energy. For this, they consider having a solar thermal water heating system. Considering that the need for warm water is 100L/day,

    asked by Anonymous on October 26, 2013
  53. Physics

    A 250-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 30.8 ° below the horizontal. The coefficient of kinetic friction is 0.224. What should be the magnitude of P, so that the net work done by it and the kinetic

    asked by Sadi on January 28, 2013
  54. Algebra 1

    1. Solve for x. 4(x – b) = x b= 4/3x b=3/4x x=4/3b x=3/4b Solve for y, then find the value of y when given x = –2. 6x = 7 – 4y –12 7/4 19/4 24 solve for h A= 1/2bh h=2A/b 2A=b/h h=1/2Ab h=2Ab

    asked by Christopher wood on October 6, 2017
  55. algebra

    How do I solve this problem? (4x + 2)(x-3)=0 Set 4x+2 = 0 and solve for x. set x-3 = 0 and solve for x. You will have two answers for x.

    asked by pat on May 3, 2007
  56. Chemistry

    My final exam is coming up so I am doing study guides to help me practice. I would really appreciate any help that is given. 1. The hydronium ion concentration for a solution is determined to be 4.5 x 10^-7 M. What is the concentration of the hydroxide

    asked by Studying on November 25, 2012
  57. Algebra 2

    The Ferris wheel in the figure has a radius of 68 feet. The clearance between the wheel and the ground is 14 feet. The rectangular coordinate system shown has its origin on the ground directly below the center of the wheel. Use the coordinate system to

    asked by alleykatt38 on September 2, 2015
  58. Check 1 question.

    Help please!i'm not sure if i'm right. Honestly i'm not that confident about most of my work. In which of the following thermochemical equations would the deltaH be considered a heat of solution? C6H6 (s)--> C6H6 (l), deltaH = +9.87 kJ 2C8H18(l) + 25O2

    asked by Anonymous on June 22, 2012
  59. Calculus

    Use a symbolic differentiation utility to find the derivative of the function g(x)=xã((x^2)+1). Use the utility to graph the function and is derivative on the same set of coordinate axes. Describe the behavior of the function that corresponds to any

    asked by Jon on November 11, 2007
  60. Compound Interest

    I have no idea how to do this!! Please show work! Starting with the first, on each of Gideon's birthdays, Dr. Joe deposits $1100 into an account earning 2% interest compounded annually. What is the total amount in the account after the deposit made on

    asked by PLEASE HELP ASAP on September 28, 2016
  61. biology

    1. A population which meets the hardy- weinberg requirements: a. Evolves b. is small and usually isolated c. has allele frequency in equilibrium d. changes genotypic distribution from generation to generation e. always has 75% A and 25% a allele

    asked by Nancy on April 30, 2009
  62. Physic

    A vacuum pump is connected to its electric motor by a belt drive (Fig. 9-40, not to scale). The motor rotates at a rate of 1000 rev/min and the diameter of the motor shaft is 2.9 cm. How large (diameter) should the pulley be if it is designed for a speed

    asked by Anonymous on May 1, 2014
  63. Chemistry

    × a 25cm³ aliquot of ammonium iron(ii) tetraoxomanganate(vii) containing 32.9g of its salt in 250cm³ solution, needed 25cm³ of potassium tetraoxomanganate(vii) solution for a colour change to occur. what is the concentration of the potassium

    asked by Joel on July 19, 2018
  64. chemistry

    × a 25cm³ aliquot of ammonium iron(ii) tetraoxomanganate(vii) containing 32.9g of its salt in 250cm³ solution, needed 25cm³ of potassium tetraoxomanganate(vii) solution for a colour change to occur. what is the concentration of the potassium

    asked by Joel on July 19, 2018
  65. Math

    A chemist working on a flu vaccine needs to mix a 10% sodium-iodine solution with a 60% sodium-iodine solution to obtain a 50-milliliter mixture. Write the amount of sodium iodine in the mixture, S, in milliliters, as a function of the number of

    asked by Anonymous on September 6, 2008
  66. Chemistry

    The following questions refer to the following system: 500 mL of 0.02 M Mn(NO3)2 are mixed with 1.0 L of 1.0 M Na2C2O4. The oxalate ion, C2O4, acts as a ligand to form a complex ion with the Mn+2 ion with a coordination number of two. Mn2+ + C2O42- goes to

    asked by Susu on April 5, 2011
  67. CHEM REPOST...PLEASE CHEK!

    Posted by Kat on Monday, March 2, 2009 at 11:21am. A solution of volume 80.0 mL contains 16.0 mmol HCHO2 and 9.00 mmol NaCHO2. If 1.00 ml of 12 M HCl is added to this, what will be the resulting pH? Responses * CHEM HELP...PLEASE!! - DrBob222, Monday,

    asked by Kat on March 2, 2009
  68. physics

    What mechanical work must you do to lift a uniform log that is 3.3m long and has a mass of 100kg from the horizontal to a vertical position? [Hint: Use the work-energy principle.]

    asked by help me please on March 5, 2015
  69. math 11

    The axis of symmetry of a graph is the vertical line x=5. One of the x-intercepts is (11,0). What is the other x-intercept. Explain how to do this either by showing work or how to enter it into the TI83Plus. Up until now I've had equations to work with so

    asked by Juliet on October 23, 2010
  70. Chemistry

    What is the solubility of lead bromide at 25C? (Ksp = 4.6 x E^-6) You have used another name here but work the problem the same way I showed you for AgCl. The only difference is that PbBr2(s) ==> Pb^+2 + 2Br^- Post your work if you get stuck.

    asked by Chem HELP on May 6, 2007
  71. Statistics

    This is my first stats class and I don't know how to do this, could you please help me? Thank you. You are asked to determine the typical number of sales of a certain product at the store you work for. A sample of 50 days over the last quarter shows an

    asked by Melvin on October 31, 2011
  72. algebra

    Todd has 1 liter of a 20% sulfuric acid solution. How much of a 12% sulfuric acid solution must he mix with the 1 liter of 20% solution to make a 15% sulfuric acid solution?

    asked by Jennifer on August 1, 2010
  73. math

    Tickets to a show cost $10 for adults and $5 for children. The show was sold out, and the theatre has 500 seats. If the revenue collected from these ticket sales was $2900, how many adult tickets were sold?

    asked by ray on May 31, 2013
  74. mathematics-need help urgently please

    A tank with a square base of side x has a capacity of 1000m^3. If the total area is pm^3, show that p=2x^2+4000/x. Hence find the least area of the flat sheet that may be used to build the tank. Please show workings #thanks

    asked by P1 on April 17, 2016
  75. english

    to kill a mockingbird movie analysis question. 1) how does the lack of eye contact show Mayella is lying? Why is she lying? How does this show racism?How is this significant to the film? analysis further toward the so what factor. Thanks

    asked by sarah on July 18, 2013
  76. Chemistry

    Consider the following equilibrium reaction: NaHCO3(s) Na2CO3(s) + H2O(g) + CO2(g) When 100 g of sodium hydrogen carbonate are added to a reaction vessel, the temperature is increased to 200°C, and the system comes to equilibrium. What happens to the

    asked by Tanner on February 27, 2012
  77. MATH

    7. A bag contains 7 green marbles, 9 red marbles, 10 orange marbles, 5 brown marbles, and 10 blue marbles. You choose a marble, replace it, in choose again. What is P(red, then blue)? A. 77/164 B. 19/41 C. 90/1681 D. 45/41 I absolutely know is is C.

    asked by Bella on May 19, 2018
  78. Please help with Chemistry?????

    A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%. A) Calculate the absorbance (A) of each solution. B) Using

    asked by Dan on February 26, 2014
  79. Chemistry

    A standard solution with a FeSCN2+ concentration of 1.55x10^-4M has a percent transmittance (%T) of 18.8%. Another solution of unknown FeSCN2+ concentration has a percent transmittance of 44.8%. A) Calculate the absorbance (A) of each solution. B) Using

    asked by Dan on February 26, 2014
  80. solving algebraic equation

    For college orientation week,Mike sold 200 shirts.sweat shirts were priced at $50.00 each ant t-shirts at $20.00 each Mike receive a total of $6250.00 for the shirts. How many type of shirt dud Mike sell for college orientation week ?please help and show a

    asked by tanya on February 8, 2012
  81. Physics

    The efficiency of a pulley system is 47 percent. The pulleys are used to raise a mass of 47 kg to a height of 7.0 m. The acceleration of gravity is 9.81 m/s 2 . What force is exerted on the rope of the pulley system if the rope is pulled for 28 m in order

    asked by Madi on November 18, 2015
  82. physic

    4. If the same two dust particles have -1.0 x 10-10 C of charge on one, and +3.2 C x 10-10 C on the other, what is the force between them now? If the force is pushing them apart, show it as a positive number and if it is attracting them together, show it

    asked by sabrina on January 21, 2011
  83. algebra

    To completely factor 5c^2-24cd-5d^2, I used the following steps: (5c d)(c 5d) to give terms,ignoring signs,5c^2,cd,25cd,5d^2. +cd-25cd. (5c+d)(c-5d) Please correct,if necessary,and show correct way to show this problem. Thank You.

    asked by Anneliese on April 12, 2017
  84. Maths

    Esha spent 4/7of her money on carnival customs 2/5on bus and the rest at her school show what fraction of her money was spent at the show

    asked by Esha on November 10, 2015
  85. math

    A cabaret show is put together by a manager who wishes to present two comedians and three singers. He can choose from 16 comedians and 17 singers. In how many ways can he select the acts for the show?

    asked by Mike Hunt on February 27, 2011
  86. Chemistry

    A solution of AuCl- is mixed with a solution of Sn2+ under standard conditions. What is the equation? the answer is 2AuCl4- + 3Sn2+ -> 3Sn4+ + 2Au + 8Cl- how do i get this? ITS desperate... plz help me! THANK_YOU SO MUCH!

    asked by Chemistry on June 14, 2012
  87. Chemistry AP

    What are the concentrations of benzoic acid and sodium benzoate in a solution that is buffered with a pH of 4.55 and has a freezing point of -2.0 degrees Celsius? (assume complete dissociation and a density of 1.01g/mL for the solution.)

    asked by Cj on February 5, 2014
  88. Chemistry

    A solution is prepared by dissolving 35g hoemoglobin in water to make 1 litter. If osmotic pressure of solution is 10.00mmHg at 25 degree centigrade. Calculate the molarmass of the hoem6globin

    asked by Shuhudaht on June 11, 2015
  89. Chemistry

    Write half-reactions for the oxidation and reduction processes for the following: Sn2+ + IO3- -> Sn4+ + I- (acidic solution) MN2+ + H2O2 -> MnO2 + H2O (basic solution)

    asked by Mary on May 26, 2010
  90. Chemistry

    Chemistry - Danielle , Wednesday, February 11, 2009 at 7:24pm The density of a 22.0% by mass ethylene glycol (C2H6O2) solution in water is 1.03 g/mL. Find the molarity of the solution. Answer in M

    asked by Danielle on February 11, 2009
  91. chemistry

    A chemist must dilute 55.5mL of 2.80 M aqueous nickel(II) chloride NiCl2 solution until the concentration falls to 2.00 M . He'll do this by adding distilled water to the solution until it reaches a certain final volume.

    asked by jil on May 5, 2017
  92. chemistry

    calculate the molarity of an acetic acid solution if 39.96 mL of the solution is needed to neutralize 136mL of 1.41 M sodium hydroxide. the equation for the reaction is HC2H3O2(aq) + NaOH(aq) > Na+(aq) + C2H3O2(aq) +H2O(aq)

    asked by Randy on April 29, 2012
  93. Chemistry

    A 0.05 N solution of a salt occupying a volume between two platinum electrodes seprated by a distance of 1.72 cm an having an area of 4.5 cm2 has a resistance of 250 ohm. calculate equivalent conductance of a solution

    asked by Robin Singh Hayer on June 8, 2012
  94. Chemistry

    0.0158L of 0.25M HCL is needed to nutralize 22.0ml of a potassium hydroxide solution. Write the neutralization reaction then calculate the molar concentration of the KOH solution?

    asked by Donna on September 6, 2012
  95. chemistry

    calculate the molarity of an acetic acid solution if 39.96 mL of the solution is needed to neutralize 136mL of 1.41 M sodium hydroxide. the equation for the reaction is HC2H3O2(aq) + NaOH(aq) > Na+(aq) + C2H3O2(aq) +H2O(aq)

    asked by Randy on April 29, 2012
  96. chemistry help plzzz

    how can i calculate the pH of the solution obtained when 50.00mL of 0.150mol/L hydrochloric acid is added to 75mL of a 0.111 mol/L aqueous sodium hydroxide solution. need help i am stuck with that question thank you :)

    asked by tarkan on December 24, 2010
  97. Biochem

    You prepare a 1L solution of 0.5 M imidazole. (pKa= 7.05). Calculate the pH of the solution after you add 0.1 moles of HCl. I need to create an ICE table. I also know I need to use the Henderson- Hasselbalch equation but I'm confused on what to plug in.

    asked by Ashley on September 23, 2016
  98. Chemistry

    a solution is prepared by dissolving 50 g of calcium chloride in a 250ml volumetric flask which is then filled with distilled water up to the line-mark. Calculate the molar concentration of the solution.

    asked by Huda on April 5, 2014
  99. Chemistry

    Calculate the mass in g of aniline (C6H5NH2, Kb = 4.3 x 10-10) that must be added to 1.4 x 102 mL of 0.24 M (C6H5NH3)Cl solution in order to generate a buffer solution of pH 5.56. Give your answer to 2 significant figures. Noclue...

    asked by Andrew on November 24, 2007
  100. Math Help please!!

    Could someone show me how to solve these problems step by step.... I am confused on how to fully break this down to simpliest terms sqrt 3 * sqrt 15= sqrt 6 * sqrt 8 = sqrt 20 * sqrt 5 = since both terms are sqrt , you can combine them. sqrt 3* sqrt 15=

    asked by Reggie on May 20, 2007

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