Margaret

Popular questions and responses by Margaret
  1. Chemistry

    4NH3+5O2 = 4NO + 6 H20 If a container were to have 10 molecules of O2 and 10 molecules of NH3, initially, how many total molecules (reactants plus products) would be present in the container after this reaction goes to completion?

    asked on September 17, 2010
  2. Chemistry

    10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

    asked on October 8, 2013
  3. ENGLISH

    Many people are surprised to learn how __1__ poverty is __2__ America. Today millions live below the poverty line, and the number seems to escalate daily. Judy and Martin Reed exemplify the old saying, “Opposites attract.” A __3__ Judy chooses work

    asked on December 6, 2012
  4. Algebra

    A truck can be rented from Company A for $90 a day plus $0.70 per mile. Company B charges $60 a day plus $0.80 per mile to rent the same truck. How many miles must be driven in a day to make the rental cost for Company A a better deal than Company B?

    asked on January 18, 2016
  5. Chemistry

    10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

    asked on October 8, 2013
  6. Math

    how is the following simplified 3x to the third power plus 5x to the fifth power

    asked on December 31, 2010
  7. Chemistry

    A sample of gaseous PCl5 was introduced into an evacuated flask so that the pressure of pure PCl5 would be 0.54 atm at 425 K. However, PCl5 decomposes to gaseous PCl3 and Cl2, and the actual pressure in the flask was found to be 0.85 atm. Calculate Kp for

    asked on February 13, 2013
  8. physics

    Certain neutron stars (extremely dense stars) are believed to be rotating at about 100 rev/s. If such a star has a radius of 10 km, what must be its minimum mass so that material on its surface remains in place during the rapid rotation?

    asked on February 3, 2010
  9. Math

    The dimension of a rectangular pool are 32.5 feet by 15 feet. The depth of the water is 5 ft. Each cubic feet contains 7.48 gallons of water. How many gallons of water to the nearest tenth are needed to fill the pool to 75 %

    asked on May 19, 2020
  10. math

    Felicia's mom is 4 times as old as Felicia. In 16 years years her mom will be twice her age. How old is Felicia now?

    asked on September 30, 2018
  11. math

    a radio station is giving every third caller a t shirt and every tenth caller a mug. which caller will be the first to receive both prizes

    asked on September 30, 2018
  12. Psychology

    Much research is being conducted on repairing faulty sensory organs through devices such as personal guidance systems and eyeglasses, among others. Do you think that researchers should attempt to improve normal sensory capabilities beyond their

    asked on January 17, 2015
  13. Science

    Two students measured the outside temperature at noon from a thermometer hung in the playground. The two students recorded very different measurements. Give two possible reasons for why the students got such different measurements. I know one reason is one

    asked on January 7, 2013
  14. Science

    How much time is required for reflected sunlight to travel from the Moon to Earth if the distance between Earth and the Moon is 3.85 x 10 to the 5th exponent?

    asked on October 8, 2012
  15. physics

    A red bead releasd from rest at height H slides down a wire without sticking to a green bead initally at rest. The mass of the green bead is half that of the stuck together beads both continue to slide down the wire and then slide back up. With the

    asked on December 6, 2011
  16. engineering physics

    An object of mass m is dropped at t=0 from the roof of a building of hdight h. A wind blowing parallel to the face of the building exerts a constant force F on the object. At what time t does the object strike the ground? Express t in terms of g and h.

    asked on September 25, 2011
  17. math

    is x to the 4th power plus x to the 4th power equal to x to the 8th power?

    asked on December 31, 2010
  18. math

    Heidi spent $60 on clothing items. she bought 2 pairs of shorts $10 each. some t-shirts for $4 each and some sandals for $12 each. How many of each clothing item did she purchase

    asked on September 30, 2018
  19. Math

    Explain why the great white shark can grow to a length of 4.9 m.

    asked on January 14, 2016
  20. Math

    the great white shark can grow length of 4.9 m. the mako shark can grow to a length of 40 dm.which shark can grow to the greater length? explain answer

    asked on January 14, 2016
  21. statistics

    The time needed to complete a final examination in a particular college course is normally distributed with a mean of 79 minutes and a standard deviation of 8 minutes. Answer the following questions. Assume that the class has 60 students and that the

    asked on November 15, 2015
  22. Psychology

    A researcher strongly believes that physicians tend to show female nurses less attention and respect than they show male nurses. She sets up an experimental study involving observations of health clinics in different conditions. In explaining the study to

    asked on January 13, 2015
  23. math

    The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal

    asked on October 14, 2013
  24. Physics

    A 2.5 kg block sits on an inclined plane with a 30 degree inclination. A light cord attached to the block passes up over a light frictionless pulley at the top of the plane and is tied to a second 2.5 kg mass freely hanging vertically. The coefficients of

    asked on October 11, 2013
  25. Chemistry

    Calculate the pH after 0.013 mole of gaseous HCl is added to 272.0 mL of each of the following buffered solutions. (Assume that all solutions are at 25°C.) (a) 0.080 M C5H5N and 0.19 M C5H5NHCl (b) 0.72 M C5H5N and 1.52 M C5H5NHCl

    asked on March 13, 2013
  26. Chemistry

    Consider a solution that contains both C6H5NH2 and C6H5NH3+. Calculate the ratio [C6H5NH2]/[C6H5NH3+] if the solution has the following pH values. (Assume that the solution is at 25°C.) (a) pH = 4.70 (b) pH = 5.26 (c) pH = 5.42 (d) pH = 4.96

    asked on March 13, 2013
  27. Chemistry

    Calculate the pH of a solution that is 0.124 M C2H5NH2 and 0.124 M C2H5NH3Cl. (Assume that the solution is at 25°C.)

    asked on March 13, 2013
  28. Chemistry

    Determine the theoretical field of aspirin for a student who started the experiment with 2.489 g of salicylic acid. Show your work.

    asked on February 12, 2013
  29. Science

    How many minutes are required for a radio signal to travel from Earth to a space station on Mars if Mare is 7.83 x 10 to the 7th power km?

    asked on October 8, 2012
  30. Economics

    To improve its standard of living, a nation’s economy must A. remain stable. B. grow through innovation. C. reach economic equity. D. allow the central government to make economic decisions. Reset Selection

    asked on September 5, 2012
  31. Math Help Please

    Let U = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18}, A = {10, 12, 14, 16}, B = {13, 17}, and C = {10, 13, 16, 17, 18}. List all the members of each of the sets. (Enter solutions from smallest to largest. If there are any unused answer boxes, enter NONE in the

    asked on November 13, 2011
  32. tenth grade science

    What can you conclude about the effect of the thermal expansion of water on sea level?

    asked on October 24, 2011
  33. Physics

    A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? b. To

    asked on September 19, 2011
  34. physics

    A landscape architect is planing an artificial water fall. Water flowing at 1.11 m/s will leave the end of a horizontal channel at the top of a vertical wall h=4.00 m high. Will the space behind the waterfall be wide enough for a pedistrian walkway? To

    asked on September 19, 2011
  35. Physics 112

    Two stationary point charges of 5.00 and 2.00 are separated by a distance of 60.0 . An electron is released from rest at a point midway between the charges and moves along the line connecting them. What is the electric potential energy of the electron when

    asked on February 11, 2011
  36. Physics

    A 21.0-kg box rests on a frictionless ramp with a 15.1° slope. The mover pulls on a rope attached to the box to pull it up the incline. If the rope makes an angle of 43.6° with the horizontal, what is the smallest force F the mover will have to exert to

    asked on October 9, 2010
  37. Marketing Foundation

    Select a purchase you personally have made recently and describe your buying process, including any other parties involved in the buying process and their roles in your purchase decision. To do this, please complete the following template and make sure to

    asked on June 2, 2010
  38. Math 7th grade

    Susan has red, blue, and yellow sweaters. Joanne has green, red, and white sweaters. Diane's sweaters are red, blue, and mauve. Each girl has only one sweater of each color and will pick a sweater to wear at random. Find the probability that each girl

    asked on May 23, 2010
  39. Managerial Economics

    From Table 4-1 in the text, determine by how much the demand for Florida Indian River oranges would change as a result of a 10 percent increase in the price of Florida interior oranges, and vice versa. Table 4-1: Type of Orange Florida Indian River Florida

    asked on December 14, 2009
  40. 4th grade

    can someone tell me how I can figure out what is a long i & short i, & how I can tell the diference? thank you

    asked on August 25, 2009
  41. Spanish

    The instructions say: "Change the verbs from the present tense to the present progressive" and gives the following example but no answer "Yo miro la television." What do I do?

    asked on November 27, 2007
  42. math

    a cube has an edge length of x cm write an equation for the volume v of the cube in term of x . if the length of each edge were doubled how would the volume change if the length were tripled how would volume x³ i mean the equation would be v=x³

    asked on January 21, 2007
  43. math

    faces of alarge cube are painted 864 are painted on one face what is the length edge of large cube how many are unpainted how many are painted on two faces and three faces See my response to your previous question. Use that information for this problem. I

    asked on January 21, 2007
  44. math

    a large cube is built from centimeter cube. faces of large cube are painted 1000 are unpainted what is the edge length ,how many are painted on one face two face and three faces If 1000 are unpainted, that must mean that the inner dimensions are 10x10x10.

    asked on January 21, 2007
  45. math

    a cube has an edge length of 12cm faces of large cube are painted how many are painted on 3,2,1 and how many are unpainted This makes absolutely no sense to me. Sorry.

    asked on January 21, 2007
  46. chem

    Can someone please help me with the following questions? 1:Suppose you were given an ancient wooden box. If you analyze the box for carbon-14 activity and find that it is 50% of that of a new piece of wood of the same size, how old is the wood in the box?

    asked on January 2, 2007
  47. Sociology

    Government institution,family institution which is more important in the society?

    asked on September 26, 2018
  48. BC Calculus

    Solve this problem algebraically, using your knowledge of derivatives. Do not solve by graphing. If 800 feet of fencing is used to enclose a rectangular plot of land that borders a river, what is the maximum area that can be enclosed?

    asked on April 16, 2018
  49. AP Physics

    Hi! I'm supposed to derive an algebraic formula to solve for the acceleration using one of the linear kinematics formulas of an elevator with a person inside that begins to accelerate from rest moving downward. If it travels a know distance, d, in reaching

    asked on March 30, 2018
  50. Health And Physical Education

    Identify a common defense mechanism that protects you from an uncomfortable? A.reaction formation B.abstinence C.mature behaviors D.acceptance I would like to know if anyone knew the answer and if so can you please tell me my parents are getting on to me

    asked on October 7, 2016
  51. geography

    Some have a hundred some have none Clues given -It is very colourful -You see it every morning

    asked on September 8, 2016
  52. Business maths

    An amount of k20.000 is invested for 5 years in a credit union which pays an annual untreated rate of 4.5 percent. Find accumulated value after 4 years if intrest rate is a: annually b:semi annually c:quarterly e:monthly

    asked on August 17, 2016
  53. science

    How much sodium bromide do I need to make 100 ml of 0.2m solution?

    asked on March 20, 2016
  54. Math

    Suzy earned $6.10 per hour in 2008 and $9.15 in 2011. How many times greater was the amount Suzy earned per hour in 2011 then in 2008? $9.15 - $6.10= $3.05

    asked on February 3, 2016
  55. Algebra 2

    Can someone please tell me how to solve and graph this system of trinomial quadratic inequalities? {y is greater than or equal to x^2+6x+12} {y

    asked on June 16, 2015
  56. Algebra 2

    Can someone please tell me how to solve and graph this system of trinomial quadratic inequalities? {y is greater than or equal to x^2+6x+12} {y

    asked on June 16, 2015
  57. Chemistry

    I have water pH 7.0 insulation with various other things that do not affect pH, I am trying to add X amount of HCL to lower the solution to a pH of 1.5 I know pH=-log[HCl] but I'm not sure how to approach this problem, after this I am then trying to add

    asked on April 24, 2015
  58. Math

    you need to clean the gutters of your home. the gutters are 24 FT above the ground. for safety, the distance a ladder reaches up a wall should be four times the distance from the bottom of the ladder to the base of the side of the house. Therefore the

    asked on February 19, 2014
  59. Accounting. Present Value.

    Suppose you want to have $5,000 saved at the end of five years. The bank will pay you 2% interest on your money. How much would you have to deposit today to have the $5,000 you want at the end of five years.

    asked on February 4, 2014
  60. Chemistry

    How many moles of Aluminium Bromide is fromed from 4.0 moles of Aluminium in equation: 2Al + 3 Br2 = 2 AlBr3?

    asked on November 5, 2013
  61. math

    The Fourier series expansion for the periodic function,f(t) = |sin t|is defined in its fundamental interval. Taking π = 3.142, calculate the Fourier cosine series approximation of f(t), up to the 6th harmonics when t = 1.09. Give your answer to 3 decimal

    asked on October 14, 2013
  62. Chemistry

    10.7L of a gas at 1.75 atm are expanded to 20.0L at a mass constant temperature.what the new gas pressure?

    asked on October 8, 2013
  63. Mathmatics

    A function of two variables is given by, f(x,y) = e^2x-3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places. Any kind soul to help on the problem. My professor raise this problem to me. i am so stuck.

    asked on September 29, 2013
  64. English Composition 1

    I need to change the syle of writing from a chapter in a book. From whatever syle it is written in to one of, gothic romance, pulp fiction or horror story. I don't know how to write in any of those styles, I don't know how to write!

    asked on July 22, 2013
  65. Finance

    Calculate the return and standard deviation for the following stock, in an economy with five possible states. If a Boom (Probability=25%) economy occurs, then the expected return is 30%. If a Good (Probability=25%) economy occurs, then the expected return

    asked on June 4, 2013
  66. 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 on March 13, 2013
  67. Chemistry

    Consider the titration of 41.5 mL of 0.213 M HCl with 0.123 M KOH. Calculate the pH of the resulting solution after the following volumes of KOH have been added. (Assume that all solutions are at 25°C.) (a) 0.0 mL (b) 10.0 mL (c) 40.0 mL (d) 80.0 mL (e)

    asked on March 13, 2013
  68. Chemistry

    Calculate the pH of a solution formed by mixing 124.8 mL of 0.481 M KF and 130.7 mL of 0.084 M HClO3.

    asked on March 13, 2013
  69. Chemistry

    What volumes of 0.47 M HF and 0.47 M NaF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.50? HF NaF

    asked on March 13, 2013
  70. Chemistry

    You make 1.00 L of a buffered solution (pH = 5.10) by mixing propanoic acid and potassium propanoate. You have 1.00 M solutions of each component of the buffered solution. What volume of each solution do you mix to make such a buffered solution? propanoic

    asked on March 13, 2013
  71. Chemistry

    How many moles of NaOH must be added to 1.0 L of 2.2 M HF to produce a solution buffered at each pH? (a) pH = pKa (b) pH = 4.24 (c) pH = 4.60

    asked on March 13, 2013
  72. Chemistry

    A buffered solution is made by adding 48.6 g C2H5NH3Cl to 1.00 L of a 0.77 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

    asked on March 13, 2013
  73. Chemistry

    Calculate the pH after 0.016 mole of NaOH is added to 1.05 L of a solution consisting of 0.138 M HONH2 and 0.127 M HONH3Cl, and calculate the pH after 0.016 mole of HCl is added to 1.05 L of the same solution of HONH2 and HONH3Cl. (Assume that all

    asked on March 13, 2013
  74. Chemistry

    Calculate the pH after 0.14 mole of NaOH is added to 1.07 L of a solution that is 0.54 M HF and 1.15 M NaF, and calculate the pH after 0.28 mole of HCl is added to 1.07 L of the same solution of HF and NaF. 0.14 mole of NaOH 0.28 mole of HCl

    asked on March 13, 2013
  75. Chemistry

    Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

    asked on February 28, 2013
  76. Chemistry

    Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

    asked on February 27, 2013
  77. Chemistry

    Would you expect the pressure of a 12.5 mL syringe of natural gas to be the same as the pressure of 12.5 mL of air? In other words, is Boyle's Law dependent on the type of gas that is being measured?

    asked on February 26, 2013
  78. Chemistry

    Given the following functions, answer the questions: Temperature (°C) Kw 0 1.1410−15 25 1.0010−14 35 2.0910−14 40. 2.9210−14 50. 5.4710−14 Is the autoionization of water exothermic or endothermic? (b) What is the pH of pure water at 35°C? (c)

    asked on February 19, 2013
  79. Chemistry

    Determine if the solubility would increase, decrease, or stay the same: 1) A saturated solution of sugar water is cooled from room temp to 0 degrees Celsius. 2) A solution of ocean water with dissolved oxygen is heated from 10 degrees Celsius to 15 degrees

    asked on February 19, 2013
  80. Chemistry

    What is the % M/M concentration of 5.00 mL of methanol in 25 g solution of methanol in water? The density of methanol is 0.791 g/mL. The density of water is 1.000 g/mL. What is the % V/V concentration for the solution? Please show work.

    asked on February 19, 2013
  81. Chemistry

    How many grams of magnesium sulfate would you need to make 0.500 L of a 10.0% M/V solution in water? Please show work.

    asked on February 18, 2013
  82. Chemistry

    If you want to make 75 mL of a 0.015 M solution of B(OH)3 in water, how many grams of B(OH)3 would you need?

    asked on February 18, 2013
  83. Chemistry

    Given the following equilibrium constants are given at 377°C, 1/2 N2(g) + 1/2 O2(g) NO(g) K1 = 110−17 1/2 N2(g) + O2(g) NO2(g) K2 = 110−11 N2(g) + 3/2 O2(g) N2O3(g) K3 = 210−33 N2(g) + 2 O2(g) N2O4(g) K4 = 410−17 determine the values for the

    asked on February 13, 2013
  84. Chemistry

    At a particular temperature, 13.7 mol of SO3 is placed into a 3.9-L rigid container, and the SO3 dissociates by the reaction given below. 2 SO3(g) 2 SO2(g) + O2(g) At equilibrium, 3.8 mol of SO2 is present. Calculate K for this reaction.

    asked on February 13, 2013
  85. Science

    At 25°C, Kp = 2.910−3 for the following reaction. NH4OCONH2(s) 2 NH3(g) + CO2(g) In an experiment carried out at 25°C, a certain amount of NH4OCONH2 is placed in an evacuated rigid container and allowed to come to equilibrium. Calculate the total

    asked on February 13, 2013
  86. Math

    X^3+9x^2-108¡Ý0

    asked on December 29, 2012
  87. physics

    2) Tube (b) is also filled with water, A1 is 0.05m2 and A2 is 0.08m2 Two pistons are placed in both ends of the tube and forces, F1 and F2 are exerted on the pistons so that they remain at the same height. If F1 = 20N what is F2? (I got the answer to this

    asked on November 7, 2012
  88. Statics

    The right angle uniform slender bar AOB has mass m. Assuming a frely hinged pivot O, determine the magnitude of the normal force at A and the magnitude of the pin reaction at O.

    asked on October 16, 2012
  89. Health

    What causes depression? A. Genetic issues B. Biochemical issues C. There is no known cause D. Environmental issues Reset Selection

    asked on October 10, 2012
  90. Science

    In black and white photography, a photon energy of about 4.00 x 10 to the negative 19th power I is needed to bring about the changes in the silver compounds used in the film. Explain why a red light used in a darkroom does not affect the film during

    asked on October 8, 2012
  91. Economics

    How does the market price of a good in a monopoly market compare with the market price of the same good in a perfectly competitive market? A. The price is higher. B. The price is lower. C. The prices cannot be compared. D. The prices are the same.

    asked on September 12, 2012
  92. Penn

    I need to write a paragraph why i choose medical billing. It has to have different experiences that motivate you to choose that field

    asked on July 30, 2012
  93. writing

    what is the behaviors associated with editing

    asked on April 22, 2012
  94. Microeconomics

    What is the definiton of marginal proficiency consumer?

    asked on April 11, 2012
  95. chemistry lab

    Explain how the differences in the solubility products of AgI and AgCl make this experiment possible. Include in your discussion a narrative of what is happening to the electrode potentials and the I-, Cl-, and Ag+ ions.

    asked on December 2, 2011
  96. G-Chem

    How man grams of Fe+3 are required to make 1.0L of an aqueous solution of 10 ppm Fe+3: (Assume the densit of water is 1.00g/mL)

    asked on October 5, 2011
  97. physics

    A ball is thrown upward. After reaching a maximum height, it continues falling back to- ward Earth. On the way down, the ball is caught at the same height at which it was thrown upward.If the time (up and down) the ball remains in the air is 2.3 s, find

    asked on September 15, 2011
  98. physics

    A stone is thrown straight up from the ground with an initial speed of 30.5 m/s . At the same instant, a stone is dropped from a height of h meters above ground level. The two stones strike the ground simultaneously.Find the height h. gravity is 9.8 m/s2 .

    asked on September 15, 2011
  99. algebra

    . Solve using the multiplication principle. 5¡Á¡Ý-4

    asked on May 20, 2011
  100. Physics 112

    Three point charges with values = 4.00 , = 1.00 , and = 7.00 are placed on three consecutive corners of a square whose side measures = 5.00 . Point A lies at the fourth corner of the square, diagonally across from . Point B lies at the center of the

    asked on February 11, 2011

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