Questions Asked on
July 26, 2014

  1. Chemistry

    A 0.60 g sample consisting of only CaC2O4 & MgC2O4 is heated at 5000C, converting the two salts of CaCO3 and MgCO3 . The sample then weighs 0.465 g. If the sample had been heated to 9000C, where the products are CaO & MgO, what would the mixtures of oxides

    asked by Susan
  2. math

    x = t − 2 sin t, y = 1 − 2 cos t, 0 ≤ t ≤ 6π Set up an integral that represents the length of the curve.

    asked by Zoey
  3. Chemistry

    A metal M forms the sulphate M2(SO4)3 . A 0.596 gram sample of the sulphate reacts with excess BaCl2 to give 1.220 g BaSO4. What is the atomic weight of M? (Atomic weights : S = 32, Ba = 137.3)

    asked by Susan
  4. Chemistry

    Suppose 26.0g of sodium bromide is dissolved in 150mL of a 0.60M aqueous solution of silver nitrate. Calculate the final molarity of bromide anion in the solution. You can assume the volume of the solution doesn't change when the sodium bromide is

    asked by Angie
  5. Chemistry

    1 mole of equimolar mixture of ferric oxalate and ferrous oxalate will require xmole of KMnO4 in acidic medium for complete oxidation, x isis: a) 0.5 mole b) 0.9 mole c) 1.2 mole d) 4.5 mole

    asked by Susan
  6. calculus 2

    r=1- 3Sin theta¸ find the area enclosed by the inner loop

    asked by sarah
  7. College Bio

    If two parental organisms of genotype pp and PP were crossed, what percentage of F1 offspring would be homozygous recessive? (Assume simple Mendelian pattern of inheritance and unlinked alleles.)

    asked by Jay
  8. Algebra

    A homeowner wants to fence a rectangular garden using 60 ft of fencing. An existing stone wall will be used as one side of the rectangle. Find the dimensions for which the area is a maximum

    asked by Willia
  9. science

    Use standard enthalpies of formation to calculate the value of delata H degree for the rxn:NH3(g) + 3F2(g) = NF3(g) + HF(g)

    asked by Padlock
  10. Math

    A theater seats 200 people and charges $10 for a ticket. At this price, all the tickets can be sold. A survey indicates that if the ticket price is increased by a peso, the number of tickets sold will decrease by 10. What price will yield the greatest

    asked by 123acxcv
  11. Chemistry

    Nitric acid can be produced from NH3 in three steps process: I)4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) II)2NO(g) + O2(g) → 2NO2(g) III)3NO2(g) + H2O(l) →2HNO3(aq) + NO(g) % yield of Ist, IInd & IIIrd are respectively 50 % , 60 % & 80 % respectively the

    asked by Susan
  12. earth science

    Which of the following is not an example of a mineral crystal shape? A. Pyrite B. Kryptonite C. Quartz D. Calcite i think its A am i right

    asked by alex
  13. Chemistry

    Calculate the number of millilitres of NH3(aq) solution (d = 0.986 g/ mL) contain 2.5 % by weight NH3 which will be required to precipitate iron as Fe(OH)3 in a 0.8 g sample that contains 50 % Fe2O3.

    asked by Susan
  14. PHYSICS

    A conductor of length 0.5m moves in a uniform magnetic field of flux density 2 wbm^2. at a uniform velocity of 40m/s. Calculate the induced EMF under the following conditions: (1) the conductor moves at right angle to the magnetic field (2) the conductor

    asked by Please help me
  15. Chemistry Help

    1. Spectroscopic studies of the reaction of azide ion with the cluster [Ru3(CO)12] in acetone solvent confirmed the occurrence of process (i) under a CO atmosphere. Kinetic measurements of this rapid [Ru3(CO)12]+ N3– →[Ru3(NCO)(CO)11]–+ N2(i)

    asked by Jade
  16. Physics

    A butterfly is flying with velocity jˆ i 12 ˆ 10 + m/s and wind is blowing along x axis with velocity u. If butterfly starts motion from A and after some time reaches point B, find the value of u.

    asked by Ram
  17. chemistry

    1. What is the binding energy per nucleon? Why is the binding energy per nucleon, rather than per nuclide, used to compare nuclide stability? 2. When a nucleus forms from nucleons, is energy absorbed or released? Why? 3. Many scientists reacted skeptically

    asked by Annie
  18. physics

    A butterfly is flying with velocity 10i +12jˆ m/s and wind is blowing along x axis with velocity u. If butterfly starts motion from A and after some time reaches point B, find the value of u. Answer this Question

    asked by Ram
  19. physics

    A maass of 0.5kg is attached to one end of the helical spring and produces an extension 2.5cm the mass now set into vertical oscillation of amplitude 10mm the period of oscillation is??....g=10ms2

    asked by kingdavidda1st
  20. math

    A total of 800m of fencing material is used to enclose a rectangular field and to divide the field into four partitions by fences parallel to the width of the field. Find the dimensions of the largest are of the field that can be fenced.

    asked by dsadsad
  21. trigonometry

    Two pulleys have radii 20cm and 6cm,respectively. The smaller pulley rotates 15 times in 12 seconds. Find the angular speed of each pulley in rad/sec

    asked by helpme
  22. Algebra

    HELP! I am not sure how I would even start this problem or solve it. A hyperbola with a horizontal transverse axis contains the point at (4, 3). The equations of the asymptotes are y-x=1 and y+x=5 Write an equation for the hyperbola.

    asked by Tessa
  23. Physics -- check answers please

    I am to fill in the blanks without a word bank, my answers are in brackets. 1. A ____ diffraction pattern is unique because it has a larger central maximum. (single slit) 2. the brightest, clearest diffraction pattern is created with a _____ (barrier)

    asked by Liz
  24. SCIENCE

    A conductor of length 0.5m moves in a uniform magnetic field of flux density 2 wbm. at a uniform velocity of 40m/s. Calculate the induced EMF under the following conditions: (1) the conductor moves at right angle to the magnetic field (2) the conductor

    asked by BNzeal
  25. medical billing and coding

    a new technology that will change the role of the transcriptionist is

    asked by Anonymous
  26. Biology

    A researcher collects high-resolution photographs of the Earth taken from outer space at annual intervals for the last decade. This data would be most useful to analyze which of the following? A. Human movement during crises B. Migration patterns of large

    asked by J
  27. Physics

    I am to fill in the blanks without a word bank, my answers are in brackets. 1. When light waves reflect from media in which the speed of light is slower, their phase (crest or trough) is ____ 2. The trick to being able to observe interference patterns for

    asked by Liz
  28. PHI 208 w33k 3 quiz

    Question 3. 3. Harm may be understood as: (Points : 1) financial, physical, and emotional harm. quantifiable harm. direct but not third-party harm. all of the above.

    asked by debra
  29. Chem: x-ray

    Experiment to obtain the X-ray diffraction peaks of an unknown metal. Radiation is K_alpha from Cu. Through these diffraction peaks you wanted to determine: (a) whether the cell is SC, BCC, or FCC (b) the (hkl) value of the peaks (c) the lattice parameter

    asked by Anonymous
  30. statistic

    Lilly collects data on a sample of 40 high school students to evaluate whether the proportion of female high school students who take advanced math courses in high school varies depending upon whether they have been raised primarily by their father or by

    asked by hnin
  31. math

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -5x2 + 7x + 4. a.{–0.44, 1.84} b.{-5, 7} c.{–1.40, –0.80} d.{–1.25, 1.75} For some reason, I am thinking it is -5,7

    asked by need help
  32. Economics

    Of your implicit and explicit costs of attending college, which is more, why?

    asked by Jake
  33. physics

    A jumper of mass m=55 kg starts in a crouched position with the jumper's center of mass at a position y1=0 m. Just before the jumper leaves the floor, his or her center of mass is at y2=0.7 m. From another measurement, you have found that the velocity of

    asked by Zoey
  34. stats

    The ABC Self-Concept Inventory has a split-half reliability coefficient of 0.90, and the XYZ Self-Concept Inventory has a Spearman-Brown reliability coefficient of 0.90. If all other factors are equal, which instrument would you choose to use?

    asked by Melissa
  35. trig

    two poles of height 25 cm & 20 cm are are parallel to each other with a distance of 12 cm between them. what is the distance between the top of the two poles?

    asked by shrenik
  36. math

    Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -9x2 + 9x + 5. (a){–1.80, 1.80} (b){-9, 9} (c){–1.00, –0.56} (d){–0.40, 1.40}

    asked by help pls
  37. Math - trig

    Determine the general solution of 8 cos^2x - 4cosx - 1 =0 (8cos^2x - 4cosx)/8 =1/8 cos^2x - 4cosx=1/8 cos^2x/cosx =1+4cosx/cosx cosx = 5 x = cos^-1(5) x = error

    asked by Bontle
  38. accounting

    A city is served by two newspapers—the Tribune and the Daily News. Each Sunday reader purchases one of the newspapers at a stand. The following transition matrix contains the probabilities of a customer’s buying a particular newspaper in a week, given

    asked by bcky1958
  39. Life Science

    Less-economically developed countries will experience higher birth rates than more-economically developed countries due to A. decreased availability of sanitary water. B. higher infant mortality rate. C. higher literacy rate of women. D. increased

    asked by J
  40. chemistry

    ph of 6.10mL of 1.20M HCl diluted to 0.560L .

    asked by estonia
  41. wavelength

    A human's wavelength is similar to the size of: a) a cell b) atom c) nucleus d) proton e) something else and why?

    asked by Liz
  42. chemistry

    A silicon ribbon measuring 100 micron thick, 5 mm wide, and 1 m long has 5 volts applied across its long dimension. The resistivity of silicon is 640 ohm-m. How much current will flow through the ribbon? Express your answer in Amps

    asked by Muanda
  43. math

    the table below shows some values for the function f. if f is a linear function, what is the value of a+b? table: X | f(x) 0 | a 1 | 12 2 | b

    asked by anonymous
  44. Spanish use of Imperfect Verbs

    Can someone please check if I've used the Imperfect correctly? Thank You :) ¡Ola mis amigos y familias, me llamo Nick y soy en Miravida Soho en Buenos Aires, la ciudad mayor de Argentina! Mis compañeros de viajes y yo pasamos un buen rato hoy. En la

    asked by Nick
  45. calculus 2

    find dy/dx and (d^2)y/(d^2)x for x=2sint y=3cost 0

    asked by sarah
  46. chemistry

    *This is part of an exam. so please don't give full solution* just trying to bump ahead of a block. The decomposition of NO2 at room temperature exhibits the following variation in concentration with time: The concentration of NO2 is expressed in

    asked by 3.091x
  47. math

    A company charges $200 for each leather bag on order of 150 or less. The cost of each bag is reduced by $1 for each order in excess of 150 pieces. How many bags on order would result in maximum revenue? What is the maximum revenue?

    asked by dsadsad
  48. Ethics

    For Mill, when calculating the utility of any particular action, we must include the happiness it will produce for A. The family of the individual who will perform the action B. All sentient creatures C. The indivvidual who will perform the action D. All

    asked by Pat
  49. Math 221

    How can I explain how I got the answer. I received the help, but no explanation to how the answer was simplified. 1=1(-7) +b b = 8 In other words, you need to explain what you did to simplify 1=1(-7) + b. This is also true for the perpendicular equation

    asked by Karen
  50. College English

    John Winthrop “A Model of Christian Charity" Discuss the manner in which the theories expressed by Winthrop are in some degree evident in American government and culture today. CAN SOMEONE TELL ME IF I ANSWER IT RIGHT? In Prospero's America, Walter W.

    asked by Kiara
  51. math

    Mr. Brown sold a jacket for $240, this making a profit of 20% on his cost. Later, he sold another jacket for $240 this time suffering a loss of 20% on his cost. The result of the two sales was A.He gained $40.00 B.He gained $10.00 C.He lost $20.00 D.He

    asked by Johnny
  52. math

    If I have a peice of carpet that is 9 ft by 8 ft and the cost is .59 per square ft how much does it cost for the carpet?

    asked by nicole
  53. CHEMISTRY

    how to predict that given complex is sp3 dsp2 hybridized

    asked by AYESHA
  54. Math

    What is 5/11 minus 7/11

    asked by Anabelle
  55. CHEMISTRY

    how to predict that given complex is sp3 dsp2 hybridized because in Mcqs they ask to identify hybridization in given compound

    asked by AYESHA
  56. calculus 2

    use the simpsons rule with n=10, arc length y=^3√x, for 1

    asked by sarah
  57. POL 201

    Those who attended the Constitutional Convention believed that (Points : 1) England was an evil society. America had made a great mistake in fighting the revolutionary war. British institutions of government were good but they became corrupt. America would

    asked by Sara
  58. calculus 2

    Evaluate integral x/(1+|x|), (x,-3,3)

    asked by sarah