Questions Asked on
January 11, 2013

  1. Math

    1. 5h – 9 = –16 + 6h (1 point) 4 –7 7 10 2. 4x + 4 = 9x – 36 (1 point) –8 –7 8 –3 3. Which of the following equations has an infinite number of solutions? (1 point) 3x – 3 = –4x 2y + 4 – y = 16 7x + 5 = 4x + 5 + 3x 6y – 2 = 2(y – 1)

    asked by plz help
  2. Physics

    Black Holes are suspected when a visible star is being noticeably pulled by an invisible partner that is more than 3 times as massive as the Sun. A red giant star is accelerated in a linear direction by gravity at 0.075 m/s2 towards an object that is 9.4

    asked by Alex
  3. English 11A Please Help.

    In three to five sentences, explain how Ambrose Bierce's use of foreshadowing or flashback influence "An Occurrence at Owl Creek Bridge."

    asked by Ghost
  4. geometry

    What is the most precise name for quadrilateral ABCD with vertices A(–3, 2), B(–1, 4), C(4, 4), and D(2, 2)? 1. parallelogram 2. rhombus 3. quadrilateral 4. rectangle

    asked by Bob
  5. Math

    Write a Problem Write a multiplication story for 9x8. Include the product in your story.

    asked by Quan
  6. physics

    An engine moves a motorboat through water at a constant velocity of 22 meters/second. If the force exerted by the motor on the boat is 5.75 × 103 newtons, what is the power of the motor?

    asked by luis
  7. Math conversion

    If one meter is equal to 39.4 inches, how many centimeters are in one foot? Answer 30.4 cm How is this answer obtained? i know there is 12 in in a foot and 100 centimeters in a meter. what happens next?

    asked by jakey
  8. science

    You need to get to class, 200 meters away, and you can only walk in the hallways at about 1.5 m/s. (if you run any faster, you’ll be caught for running). How much time will it take to get to your class?

    asked by dar
  9. Business Math

    Al Smith, who lives in Territory five, carries 10/20/5 compulsory liability insurance along with optional collision that has a $300 deductible. Al, who was at fault in an accident, caused $4,000 damage to the other auto, as well as $900 damage to his own.

    asked by Wally
  10. Physics

    A point charge +6.7 uC is placed at the origin, and a second charge –3.6 uC is placed in the X - Y plane at (0.40 m , 0.55 m ). Where should a third charge be placed in the plane so that the net force acting on it is zero?

    asked by Jim
  11. Math

    An open-topped box can be created by cutting congruent squares from each of the four corners of a piece of cardboard that has dimensions of 20cm by 30cm and folding up the sides. Determine the dimensions of the squares that must be cut to create a box with

    asked by Cadmus
  12. Biology

    check my answers? 1. What is the difference between Darwin's theory of evolution and Lamarck's theory of evolution? A)Darwin believed that organisms changed gradually over time, but Lamarck thought they changed suddenly. B)Lamarck believed that organisms

    asked by Corie
  13. math

    sin a=3/5, a lies on quadrant 1 and sin b=5/13, b lies on quadrant 2. Find cos(a+b)

    asked by i need help
  14. health

    If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a A. coding specialist B. medical assistant C. receptionist D. transcriptionist

    asked by Bobby
  15. 7th grade health true or false

    11. Disagreements are a normal part of life. (1 point) True False 12. Talking to a trustworthy adult is the best way to stop sexual abuse and get help. (1 point) True False 13. Some conflicts are made worse by peer negotiation. (1 point) True False 14.

    asked by Delilah
  16. VERY URGENT MATH~!!!!!!!!

    1. 2(x – 3) = 2x (1 point) one solution no solutions infinitely many solutions 2. 3(y – 3) = 2y – 9 + y (1 point) one solution no solutions infinitely many solutions 3. 10x – 2 – 6x = 3x – 2 + x (1 point) one solution no solutions infinitely

    asked by Gabby
  17. Chemistry

    For each pair of compounds, identify the one with the higher boiling point. I)GeCl4 or SnCl4 II)PF3 or PF5 III)H2O or H2S

    asked by Chemgam
  18. Finance

    23. Using Stock Quotes [L03] You have found the following stock quote for RJW Enterprises, Inc., in the financial pages of today’s newpaper. What was the closing price for this stock that appeared in yesterday’s paper? If the company currently has 25

    asked by Chasey
  19. Consumer Math

    Compute the square footage of carpet needed to cover a room 12' 3" x 18' 4".

    asked by Will
  20. Physics

    A ball of mass m(1) = 0.250 kg and initial v(1) = 5.00 m/s collides head-on with a ball of mass m(2) = 0.800 kg that is initially at rest. What are the velocities of the balls after the collision if they stick together?

    asked by Jackie
  21. Chemistry

    what type of reaction is AgF + CaCl2 --> AgCL + CaF2 ?

    asked by Toni
  22. math

    write a multiplication story for 9x8. include the product in your story.

    asked by Shaun
  23. History

    4. European leaders began to introduce reforms at the end of the nineteenth and the beginning of the twentieth centuries. Which of the following was not proposed? (Points : 3) shorter work hours for children accident insurance for workers old age pensions

    asked by Haylie
  24. calculus

    A car is traveling at 50 mi/h when the brakes are fully applied, producing a constant deceleration of 26 ft/s2. What is the distance covered before the car comes to a stop? (Round your answer to one decimal place.)

    asked by bobo
  25. Social Studies

    How did Roosevelt’s response to German aggression toward Britain differ from his response to Japanese aggression toward China? I think it is C or D? A.He condemned the aggression toward China but not toward Britain. B.He condemned the aggression toward

    asked by Timothy
  26. Chemistry

    (a) Propylene, H2C=CH-CH3, can be reacted to form a polymer known as polypropylene (PP). What type of polymerization reaction is most appropriate for the formation of polypropylene? i)Addition Polymerization ii)Anionic Polymerization iii)Condensation

    asked by Chemgam
  27. maths

    find the equation of the line joining the origin to the point of intersection 4x+3y=8 and x+y=1

    asked by manpreet
  28. finance

    Misty needs to have $15,000 at the end of 5 years to fulfill her goal of purchasing a small sailboat

    asked by Anonymous
  29. maths

    if the price of 3 books,2 copies, 1 pen is 320, and the price of 2 books, 3 copies, 4 pens is Rs 230 then what is the price of 1 book, 1 copy and 1 pen?

    asked by ishmal ahmed
  30. maths

    Find the equation of the straight line passing through (3,-2) and making an angle of 60 degree with the positive direction of y-axis

    asked by manpreet
  31. physices

    A molecule of DNA (deoxyribonucleic acid) is 2.22 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.95% upon becoming charged. Determine the

    asked by Anonymous
  32. solid mensuration

    what is the area of a section bounded by a closed elliptical figure in which the major and minor segments measure 60 cm and 45 cm

    asked by grace
  33. 7th grade health please

    1. The process of talking directly to the other person to resolve a conflict (1 point) conflict negotiation assault compromise 2. Forced sexual intercourse (1 point) gang assault rape neglect 3. A disagreement between people with opposing viewpoints,

    asked by Delilah
  34. history

    please help me with this!!!!!! 13. Which statement below would an Islamist be most likely to agree with? (Points : 3) All aspects of society—political, legal, economic, social, and cultural—should be guided by strict Muslim teaching. If people of the

    asked by Matt
  35. health

    Combining two or more segments of the industry to deliver the best care, at the most cost-effective rate, in the best setting refers to a/an A. integrated delivery system. B. diagnosis-related group. C. health maintenance organization. D. preferred

    asked by Bobby
  36. Data

    Research South Carolina for data that is commonly used in health services systems. This includes census data, vital statistics data (birth, deaths, marriages, and divorces), surveillance data, administrative data, and survey research data. Keep in mind

    asked by Norma
  37. HISTORY

    In his Farewell Address, Washington warned against permanent foreign alliances and A. the formation of political factions. B. lowering the tariff on imported goods. C. the power of the moneyed interests. D. the unjust oppression of black slaves.

    asked by Anonymous
  38. chemistry

    ) The solubility of bismuth iodide (BiI3) in water is 5.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)

    asked by ani
  39. Statistics & Probability

    A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in

    asked by Alia
  40. Statistics & Probability

    A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in

    asked by Alia
  41. chemistry

    For AsClF42-: a) Name the hybridization of the orbitals of the central atom. s sp sp2 sp3 sp4 sp3d sp3d2 b) Estimate the Cl-As-F bond angle. Slightly less than 90∘ Exactly 90∘ Slightly greater than 90∘ Slightly less than 109.5∘ Exactly 109.5∘

    asked by Anonymous
  42. Chemistry

    For AsClF4^2-: a)Name the hybridization of the orbitals of the central atom. i)s ii)sp iii)sp2 iv)sp3 v)sp4 vi)sp3d vii)sp3d2 b)Estimate the Cl-As-F bond angle. i)Slightly less than 90 ii)Exactly 90 iii)Slightly greater than 90 iv)Slightly less than 109.5

    asked by Chemgam
  43. Chemistry

    What is the mass of water that can be heated from 39 C to 80 C by the combustion of 150 g of methane. CH4 + 2O2 => CO2 + 2H2O Delta H= -890kJ

    asked by Lisa
  44. chemistry

    Shown below is a rough sketch of the unary phase diagram (pressure vs. temperature) for carbon dioxide (CO2), dry ice. Note the diagram is not drawn to scale and contains breaks in the axes to signify this. Using the diagram, answer the following

    asked by Dylanprof
  45. math

    The illumination a surface receives from a light source varies inversely with the square of the distance. A table lamp is 3ft from a certain work area. How far is another work area if it receives only 1/3 as much illumination as the first work area? (W/

    asked by HELP HELP HELP MNHS
  46. Chemistry

    The solubility of bismuth iodide (BiI3) in water is 10.291 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)

    asked by T
  47. chemistry

    mass of evaporating dish 22.34 mass of evaporating dish +hydrate 24.64 mass of evaporating dish +anhydrous salt 23.85 CuS04XH2O=CuSO4+XH2O 1.determine the mass of the water lost 2.determine the number of moles of the water lost

    asked by may
  48. Chemistry

    On more than one occasion when our kids were small, we would come inside from playing in the snow and I would make hot chocolate by heating the chocolate milk in the microwave. Invariably, I would get the milk too hot for at least one of them. One time,

    asked by Breanne
  49. organic chemistry

    malonic ester with urea gives

    asked by navraj
  50. Chemistry

    I have this question which I believe I solved correctly, but I was wondering if someone could look it over to make sure? The question is... Assay for Vitamin A (a fat soluble vitamin) required an extraction step into ether. In this assay, 2.00 mL of serum

    asked by Rob
  51. everything

    If you work in a hospital or doctor's office and assign numeric values to procedures and diagnoses for the purpose of reimbursement, you are a A. coding specialist B. medical assistant C. receptionist D. transcriptionist

    asked by Bobby
  52. chemistry

    (a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 ∘C.

    asked by lena
  53. math

    Which option best explains the sentence below in math terms? The Earth is covered by 30 percent land and 70 percent water.

    asked by Anonymous
  54. Algebra

    Solve each inequality algebraically:how do I solve this problem? What is the answer? Show the work. x+4/x-2 less than equal 1 thanks for your help

    asked by Jackie C
  55. Math, Statistics

    According to a recent survey, 38% of americans get 8 hours or less of sleep. if 25 people are selected, find the probability that 14 or more people will get 8 hours or less of sleep.

    asked by Sherry
  56. Chemistry

    (a) The solubility of bismuth iodide (BiI3) in water is 4.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi^3+ (aq) and I^- (aq). (b) Do you expect the solubility of (BiI3) in 0.1 M NaCL (aq) to be equal to,

    asked by Chemgam
  57. math

    how would I solve 10=7-m? I don't understand how to find the variable and I use flowchart!none of my math books show me how! so how can I solve problems like these?

    asked by Emi
  58. physics

    A 2kg and a 4kg hang freely at opposite ends of a light inextensible string which passes over a small and light pulley fixed to a rigid support calculate the acceleration of the system

    asked by john
  59. physics

    You are driving a car 33 down the road. The stoplight in front of you suddenly turns red and you slam on the brakes, skidding to a halt. You get out of the car and measure the skid marks made by your tires to be 23.5 meters (Assume positive x to be in the

    asked by Ashley
  60. spanish

    Write a complete sentence using the elementd below and replacing the words in parentheses with a direct object pronoun. 1. Jorge y erensto/quieren cerrar(su tienda)temprano 2. Sonia y yo/ nucnca perder(el dineto) en la tienda 3. Yo/no entender(tu) 4.

    asked by sherianna
  61. health

    what is the risk factor in the following situation? You and your sister are frying some eggs when a fire starts on the frying pan. Your sister starts filling a glass of water to put out the fire.

    asked by Anonymous
  62. Algebra

    My second question is in section 5.4, problem 39. x+4/x-2 < or = 1; Since the inequality in not , should the answer to this problem in the back of the book be: {x|x< or = 2}, or in interval notation: (-infinity, 2)? Please explain this problem. Thanks.

    asked by Mike P
  63. general chemistry

    Identify and discuss the differences between the terms ‘theories,’ ‘laws,’ and ‘hypotheses.’ Describe ‘controlled conditions

    asked by bea
  64. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 593.0 kg of PbS and 890 kg of PbO.

    asked by Anonymous
  65. Chemistry

    Which is the higher density of polyethylene, linear or branched? Select the choice with the best accompanying explanation. Linear polyethylene is the higher density form, as the chains are able to pack better and partially crystallize, resulting in better

    asked by c
  66. reading/language arts

    write a paragraph about using resources responsibly using these three words:renewable,nonrenewable,generate.

    asked by Ana
  67. HELP!

    y + 5 ≥ 7 y ≤ 2 y ≤ 12 y ≥ 2 y ≥ 12 can someone help me with this problem or steve could u help me?

    asked by Gabby
  68. Science

    Glass bricks are used where people want light allowed through, but still have privacy. What do the bricks do to make this happen? Please help I have searched everything and can not find the answer.

    asked by Cherie
  69. Health

    How should someone respond to avoid danger in the following situation? You are home alone when a stranger comes to the door and asks if he can use your phone.

    asked by Anonymous
  70. math

    solve the pair of equation for x and y respectively,2xpower-1 - 3y-1 equals 4 and 4xpower-1 + ypower-1 equals 1

    asked by Muiz
  71. Precalculus

    5. A water wheel has a radius of 60 feet, and the center is 14 feet above the water level. The water wheel makes a complete rotation every 45 minutes. A specific cup starts at the top of the wheel. Write a sine equation to model the above water wheel.

    asked by Valerie
  72. Chemistry

    (a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 Celsius. (b) Classify each of the following compounds as either "acidic", "basic", or "amphoteric" (able to act as

    asked by Chemgam
  73. Business English

    Which of the following should be included in the first paragraph of a prospecting job application letter? A. A complete discussion of the writer's skills and qualification. B. A statement that you are applying for a particular advertised position. C. Dates

    asked by Chandan
  74. Chemistry

    Arginine O 2.01 H2N---CH--C----OH 9.02 CH2 CH2 CH2 NH 12.48 C==NH NH2 ________________________________________ 9.78 O 2.35 H2N----CH---C----OH CH3 Glycine ________________________________________ Shown above are images of two amino acids, along with the

    asked by Chemgam
  75. Chemistry

    The energy versus bond length for the average bond in two solids, A and B, is shown below. Atoms in the two solids have the same number of nearest neighbots. (a) Which solid has the largest cohesive energy? A or B (b) Which solid has the smallest bond

    asked by Chemgam
  76. maths

    if Kis the smallest positive integer such that(2k)(5200) has 303digits. Find the sum of the digits of that number when expanded.

    asked by Anonymous
  77. Psychology

    Human relations are universal, but those defined as basic or primary are: a. the same from culture to culture b.defined differently in different cultures

    asked by Brian
  78. chemistry

    mass of evaporating dish 22.34 mass of evaporating dish +hydrate 24.64 mass of evaporating dish +anhydrous salt 23.85 CuS04XH2O=CuSO4+XH2O 1.determine the mass of the water lost 2.determine the number of moles of the water lost

    asked by lela
  79. Chemistry

    Shown below are several options for the box notations of the ground state electron configuration of the following gas-phase species. Identify the correct electronic configuration. i. Al2− ii. Mn (a)Select the reason that best explains why the first

    asked by c
  80. Math

    Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

    asked by Bill
  81. Chemistry

    Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.

    asked by selly
  82. Math

    Kamman VanMarko Plumbing equipment sales Commission rate: 9 1/2% Annual base salary: $17,496 Month's sales: $2,460 What is the monthly pay?

    asked by Anon
  83. english

    explain how content purpose and audience and tone impact academic writing. not good in writing papers

    asked by Tracey
  84. Chemistry

    (a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. (b) Calculate the absorption edge of this material. Express your answer as a wavenumber

    asked by Ling
  85. Chemistry PLEASE HELP:(

    I really need someone to explain this stoichiometry problem. Directions: Outline how to determine the limiting agent. Determine the excess reactant and how much is left over. Determine the amount of each of the products produced. CaSO4 + AuF3 = CaF2 +

    asked by Shelbie
  86. Physics

    The International Space Station is 370 km above the Earth's surface (Re = 6378 km, Me = 5.98 x 10^24 kg). What is the linear velocity of the space station in m/s

    asked by Alex
  87. Chemistry

    A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 1.828×10−10 m. Determine the frequency (in hz) of the interacting photon.

    asked by kaken
  88. chem

    What volume of 0.250 M H2SO4 is required to titrate a solution containing 0.200 g of KOH to its endpoint?

    asked by bob
  89. books

    Hi I need help with a novel illustrated by Wayne Permenter 'The Stray' I need reference to context and question answers on them since it is very difficult for me to work on it. Can you please be of any help.

    asked by Anonymous
  90. Physics

    For the problem (8.99 X 10^9 NM^2/c^2)(1 X 10^-6c) / (.1m)^2 = .90 N When I put this in my calculator I did not get .90N. Am I suppose to convert the units to get the answer. Thank you for your help.

    asked by Hannah
  91. Chemistry

    Answer the following questions by referencing the six stress-strain curves below. (a) Which of the stress-strain curves are for materials that are purely elastic? A B C D E F You have used 0 of 2 submissions 1.0 POINT (b) Which purely elastic material has

    asked by Ankur
  92. Chemistry

    Shown below is a rough sketch of the unary phase diagram (pressure vs. temperature) for carbon dioxide , dry ice. Note the diagram is not drawn to scale and contains breaks in the axes to signify this. Using the diagram, answer the following questions: (a)

    asked by Chemgam
  93. Chemistry

    (a) What is the distance between second nearest neighbor atoms in vanadium? Express your answer in cm. (b) What is the interplanar spacing between (110) planes in vanadium? Express your answer in cm. (c) At what angle must (110) planes of vanadium be

    asked by Chemgam
  94. Chemistry

    Identify the element that, acting as a target in an x-ray tube, generates Lα radiation of wavelength, λ, equal to 3.07 nm (3.07 x 10-9). i) Cu ii) Ni iii) Li iv) Ti v) K vi) Mo vii) W

    asked by Chemgam
  95. Chemistry

    Shown above are images of two amino acids, along with the pKas of each of their titrateable groups. (a) Calculate the isoelectric point (pI) of the dipeptide Glycine-Arginine. unanswered (b) Calculate the isoelectric point (pI) of the dipeptide

    asked by Ankur
  96. Chemistry

    (a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. (b) Calculate the absorption edge of this material. Express your answer as a wavenumber

    asked by Chemgam
  97. To all the Chemistry spammers ...

    anang, John, Prya, Sergey, Dylanprof, Amelia, kkr, kiril, Lena, c ~ Dumping ALL your homework questions in any one place (such as this website) is considered spamming. I've removed your collective 50+ posts except for those which received responses. Do not

    asked by Writeacher
  98. greenhouse biology

    what organism is a porkaryotic cell?

    asked by ana
  99. chemistry

    The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% of its

    asked by Anonymous
  100. Chemistry

    Identify the element that, acting as a target in an x-ray tube, generates Lα radiation of wavelength, λ, equal to 3.07 nm (3.07 x 10-9). Cu Ni Li Ti K Mo W

    asked by Sergey
  101. chemistry

    Tricky one- my math fails here (a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in

    asked by mangozier
  102. find the LCM

    Lcm of 2b, 6c

    asked by Anonymous
  103. Math

    I am stuck on several probability questions. A spinner that has 15 equal sized sections numbered 1 to 15 is spun twice. What is the probability the spinner lands on an odd number and then on an even number? A. 56/225 B. 169/225 C. 1/15 D. 21/225 I chose A.

    asked by Jack
  104. medical transcriptionist

    what is extremely importan in terms of patient care as well as for legal purposes.

    asked by tammy
  105. algebra

    simplify and express the answer using positive exponents only m8m-14

    asked by Queen
  106. Unit Conversion. Help Please.

    Hi, I having trouble with unit conversions. I don't really get the concept of what I have to do. Please, if anyone could help and explain step by step on how to approach an equation like this, it would much appreciated. Thanks. 55miles per hour to ?yards

    asked by Patrick DiCoco
  107. maths

    If cosθ + cos^2 θ = 1, then sin^12 θ + 3 sin^10 θ + 3 sin^8 θ+ sin^6 θ + 2 sin^4 θ + 2 sin^2 θ – 2 =?

    asked by Anonymous
  108. math

    show me how to calculate percentage return on the security if the payoff to the security in one year is $1000 and the security costs is $1500 today?

    asked by ron
  109. Math

    -k=287.658. I don't understand how to get the answer

    asked by Alana
  110. Algebra 1

    So as I was doing me hw, I ran into this question, and I cant figure it out... Anyone wanna try? 7. The ratio of the perimeters of two triangles is 2:5. The perimeter of the larger triangle is 20 cm. What is the perimeter of the smaller triangle?

    asked by Miranda
  111. CHEMISTRY

    The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.

    asked by jon
  112. Chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 807.0 kg of PbS and 1210 kg of PbO

    asked by mangozier
  113. chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 553.0 kg of PbS and 830 kg of PbO.

    asked by ani
  114. economics

    The privatisation of public enterprises will lead to efficient management of resources in the economy. The statement can be best be described as

    asked by murjanatu
  115. Chemistry

    Calculate the maximum wavelength of electromagnetic radiation capable of breaking the C-N bond in lysine. DATA: Average Bond Energies (kJ/mol) N-N 160 C-C 350 Express your answer in meters.

    asked by selly
  116. Chemistry

    The rate constants for a first order decay reaction are found to be: k287.3∘C=1 x 10−4 s−1 k327.4∘C=19.2 x 10−4 s−1 (a) Determine the value, in s-1 of k250∘C (b) How long will it take, at 350 ∘C, for the reactant to decay to 1% of its

    asked by selly
  117. subject verb agreement

    there are several forms that you have to complete when you adopt a pet

    asked by tasha
  118. Chemistry

    The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.

    asked by Ankur
  119. algebra

    solve 9x+8=2+8

    asked by Queen
  120. chem

    (a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 ∘C.

    asked by larry
  121. Discreete math problem

    Determine the quotient q and remainder r for each of the following. where a is the dividend and b is the divisor. a=23, b=7

    asked by john
  122. chem

    calculate the surface energy of 100 surface of niobium. The enthalpy of atomization of niobium is 745 kj/mol. express anser inunits of j/cm^2

    asked by larry
  123. Chemistry

    A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 5.908 X 10^-10m . Determine the frequency (in hz) of the interacting photon.

    asked by Ling
  124. Chemistry

    A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of CO2

    asked by selly
  125. Chemistry

    (a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of

    asked by Ling
  126. Creative Writing

    I'm writing a story about a boy who wakes up after dying, and he is trapped in the passageway between heaven & hell. When he wakes, he has no memory of what happened. So... When you wake up in a hospital, what are some of the first things you

    asked by Chelsea
  127. chemistry

    (a) The solubility of bismuth iodide in water is 9.091 x 10-3 M. Calculate the value of the solubility product. The dissolution products are and

    asked by mike
  128. Algebra

    The two x-intercepts are -1/2 and 3. Near -1/2: f(x)=(2x+1)(x - 3)squared show the work on solving this problem for example how do they get (2x+1)(-1/2 + 3)sqrt. Thank you for your help

    asked by Jackie C
  129. Chemistry..

    1.What is going on at the atomic level if a precipitate forms in a double replacement reaction? 2. Has a single or double replacement reaction occured if water or a gas is formed? What would you perceive as evidence that a reaction has occured if either

    asked by Anonymous
  130. Chemistry

    At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 220.0 kg of PbS and 330 kg of PbO.

    asked by kaken
  131. Chemistry..

    What is the chemical formula for stickers. Please post any links about stickers and what makes them stick.

    asked by Anonymous
  132. Creative Writing

    Help me fix this so it flows better, and has more imagery? Written from POV of a guy, just saying. "I didn't speak my question aloud; it only echoed in my mind and shine in my chestnut brown eyes as I struggled to use what little strength remained in my

    asked by Chelsea
  133. colledge algebra

    Find the slope‐intercept equation of the line with the following properties: Parallel to the line y= 7; containing the point (-3,5)

    asked by reanna
  134. Chemistry

    The solubility of bismuth iodide (BiI3) in water is 3.691 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi3+(aq) and I−(aq)

    asked by kaken
  135. chemistry

    (a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer with thickness 100 microns and net effective area of 100 cm2 covers a small perforated port in the container. The solubility of

    asked by schoolgirl
  136. chemistry

    The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern of aluminum is measured in a diffractometer with Fe Kα radiation. At what angle, θ, do you expect to observe the first

    asked by schoolgirl
  137. chemistry

    A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 3.188*10^-10m Determine the frequency (in hz) of the interacting photon.

    asked by schoolgirl
  138. Math

    Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

    asked by Bill
  139. Social Studies

    How did the Persian Gulf War affect daily life in Kuwait?

    asked by Anonymous
  140. Math

    At breakfast, Gino drank 2/3 of the orange juice in a container. He drank 15 ounces of orange juice. a) Write a multiplication equation that you can use to find the amount of orange juice that was in the container before Gino had breakfast

    asked by Gray M.
  141. algebra

    how to factor 3x^2-3x+9/16

    asked by zamarra
  142. algebra

    how to factor (2a+3b)^2-4c(2a+3b)+4c2

    asked by zamarra
  143. Math

    Show that (a^2+b^2)(c^2+d^2)=(ac+bd)^2 + (ad-bc)^2

    asked by Bill
  144. Chemistry

    The rate constants for a first order decay reaction are found to be: K287.3C = 1 X 10-4s-1 K327.4C = 19.2 X 10-4s-1 (a) Determine the value, in s-1 of K250C (b) How long will it take, at 350C, for the reactant to decay to 1% of its original concentration?

    asked by Chemgam
  145. Chemistry

    Consider a niobium single crystal. Which of the following directions has the largest Young's modulus? [100][110][111]

    asked by chacho
  146. Chemistry

    HELP!!! At temperatures above 930 ∘C, PbO reduces PbS to form metallic lead (Pb). The byproduct of the reaction is SO2. Calculate the amount of lead produced (in kg) when a reactor is charged with 487.0 kg of PbS and 750 kg of PbO.

    asked by T
  147. Calculus

    How do you simplify: 5*e^(-10x) - 3*e^(-20x) = 2 I'm not sure if I can take natural log of both sides to bring down the exponents.

    asked by Kyle
  148. Algebra 1

    Okay one last one that I've spent all night truing to figue out. 2. The width of a rectangle is 6 cm longer than its length. Its perimeter is more than 36 cm. Let l equal the length of the rectangle. a. for the width in terms of the length. W= l + 6=

    asked by Miranda
  149. Chemistry

    xplain why the value of the band gap energy, Eg, decreases in the following homologous series: Cdiamond=5.4 eV; Si=1.1 eV; Ge=0.72eV; Sn=0.08 eV. As we move down the group, bond strength increases. As the strength increases, materials become more metallic

    asked by Ankur
  150. math

    find the amplitude of y = 3sin2πx.

    asked by linda
  151. maths

    if Kis the smallest positive integer such that(2k)(5200) has 303digits. Find the sum of the digits of that number when expanded.

    asked by Anonymous
  152. physical science

    determine the velocity of the ball when it is 8m above the thrower's hand

    asked by gomolemo
  153. farmingdale

    in rhombus abcd the measure in inches of ab is 5x+7 and dc is 2x+25 find the number of inches in the length of dc

    asked by dana
  154. math

    the measures of the angles of a triangle are represented by 2x+30, 5x+10 and 7x the triangle is

    asked by dana
  155. Chemistry

    Calculate the surface energy of the (100) surface of niobium. The enthalpy of atomization of niobium is 745 kJ/mole. Express your answer in units of J/cm2.

    asked by Ankur
  156. math

    in rhombus abcd the measure in inches of ab is 5x+7 and dc is 2x+25 find the number of inches in the length of dc

    asked by liz
  157. Chemistry

    The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.

    asked by Chemgam
  158. Physical Science

    1. The most diffuse elements have the largest atomic weight. -False? 2. A quantum is a small energy unit. -False? 3. Light travels in a continuous wave. -True?

    asked by mysterychicken
  159. life

    The first antibiotic was made because of properties discovered in a certain type of A. spider. B. mold. C. blood. D. herb.

    asked by Bobby
  160. Chemistry

    Consider the following surfactants: (a) Which are nonionic surfactants? i) A ii) B iii)C iv) D v) E

    asked by Chemgam
  161. .345 g anhydrous

    What would .345g sample of anhydrous sample do to someone. Could it be harmful.

    asked by T
  162. Chemistry

    A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 0.468×10−10 m. Determine the frequency (in hz) of the interacting photon.

    asked by T
  163. english

    write a composition about whirlpools !

    asked by sarah
  164. 7th grade science

    What could increase the damage to human built structures during an earthquake? A-buildings far away from the pint of origin of the earthquake B- loose material in underlying land C- solid rock beneath buildings D-flexible buildings is it C???

    asked by Aisha
  165. Chemistry

    (a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 ∘C.

    asked by Anonymous
  166. math

    8x 5

    asked by angeline
  167. science

    What is true about the amplitude of a tsunami? A- it increases in shallow water near the shore. B- is is always lower in amplitude that a wave made by wind C- it is high enough to topple ocean liner far out sea. D- in deep water, it is 3 times higher than

    asked by Aisha
  168. social studies

    what did the US learn from the persian gulf war?

    asked by Anonymous
  169. maths

    n! is greater or equal to 2^n-1 prove by induction

    asked by Jess
  170. chemistry

    The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern of aluminum is measured in a diffractometer with Fe Kα radiation. At what angle, θ, do you expect to observe the first

    asked by jon