Questions Asked on
March 12, 2010

  1. Chemistry

    In a saturated solution of silver phosphate, the concentration of silver ion is 4.5 x 10^-4 mol/L. The Ksp of silver phosphate would be which of the following? 6.8  10-8 1.0  10-11 1.4  10-14 none of the above 1.5  10-15 In a saturated solution

    asked by Bobby
  2. College Chemistry

    a solution contains .25M Ni(NO3)2 and .25 M Cu(NO3)2. Can the metal ions be separated by slowly adding Na2CO3?Assume that for successful separation 99% of the metal ion must be precipitated before the other metal ion begins to precipitate, and assume no

    asked by Jim
  3. chemistry

    A flask contains this equilibrium Fe3+(aq) + SCN1-(aq) FeSCN1-(aq) What is observed if a few drops of iron(II) chloride is added to this equilibrium? a it becomes darker red b it becomes lighter red none of the above c it becomes colourless d. nothing

    asked by Stephan
  4. chemistry

    1.2 mol of CH3OH(g) are injected into a 2.0 L container and the following equilibrium becomes established. 2H2(g) + CO(g) CH3OH(g) + 92 kJ If at equilibrium 1.0 mol of CH3OH is still in the container the Ke must be which of the following? a. 25 d. 12.5 b.

    asked by Jess
  5. Algebra

    A landscaping company sells 40-pound bags of top soil. The actual weight x of a bag, however, may differ from the advertised weight by as much as 0.75 pound. Write an inequality involving absolute value that expresses the relationship between the actual

    asked by Anonymous
  6. Chemistry

    Suppose that 0.483 g of an unknown monoprotic weak acid, HA, is dissolved in water. Titration of the solution with 0.250 M NaOH(aq) required 42.0 mL to reach the stoichiometric point. After the addition of 21.0 mL, the pH of the solution was found to be

    asked by Val
  7. chemistry

    how can the mixture of iron fillings and sulphur be separated?

    asked by amos
  8. quimca

    Draw the Lewis structures for the following molecules: a. IBr d. SiCl4 b. CH3Br e. OF2 c. C2HCl

    asked by doralis
  9. Chemistry (heat flow, simple)

    Well I know to calculate heat flow you use, q=ms delta t. for this experiment we mixed naoh with hcl into water. the total mass (volume) of the mixture was 100g the temperature change for naoh was 11.7 degrees C and for hcl it was 11.8 degrees C now im

    asked by Abdullah
  10. Thermodynamics

    a rigid vessel of volume 1m(^3) contains steam at 20bar and 400 degrees Celcius. The vessel is cooled until the steam is just dry saturated. Calculate the mass of steam in the vessel, the final pressure of the steam and the heat rejected during the

    asked by Claire
  11. Chemistry

    Which of the following systems would be considered to be at equilibrium: I. an open flask with 2.0 mL of perfume II. a closed flask with 10 mL of water III. an open flask with 10 mL of water IV. a closed flask with an ice cube and 10 mL of water a. I d. b.

    asked by Mario
  12. personal finance

    Based on the following information,what account would be subtracted from the bank-balance side of a checking-account reconcilation? Service charge $12,Outstanding checks $145,Interest $$ 3.50,Deposit in transit $80 a)$145 b)$12 c)$157 d)$148.50 IS C RIGHT

    asked by vedrana
  13. Chemistry

    A gas-filled balloon having a volume of 3.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are −23°C and 3.00 10−3 atm, respectively. Calculate the final

    asked by Heath
  14. quimica

    Compare the molecules H2NNH2 and HNNH. Which molecule has the stronger N-N bond?

    asked by doralis
  15. Chemistry...Attn DrBob222

    Thanks for your earlier thoughts. Am still working on the problem and would like to know if you have any thoughts on my approach below: If I have a set of data that gives the apparent partition coefficient as a function of pH, over a range of pH 2-10, how

    asked by Renee
  16. CHEm 1442

    Calculate the pH of a 0.21 M CoCl3 solution. The Ka value for Co(H2O)63+ is 1.0 10-5.

    asked by pinki
  17. Chemistry

    In a saturated solution of silver phosphate, the concentration of silver ion is 4.5 x 10^-4 mol/L. The Ksp of silver phosphate would be which of the following? 6.8  10-8 1.0  10-11 1.4  10-14 none of the above 1.5  10-15

    asked by Bobby
  18. Chemistry

    How much heat is needed to melt a 25 gram ice-cube at 0 °C? The molar heat of fusion for water is 6.01 kJ/mol. A) 6.01 kJ B) 8.35 kJ C) 150.25 kJ D) 3.34 kJ E) 9.22 kJ

    asked by Natalie
  19. algebra

    A light-year is the distance that light travels in one year. Find the number of miles in a light-year if light travels 1.86 × 105 miles/second. (Round to one decimal place, and assume that there are 365 days in a year.)

    asked by larry
  20. personal finance

    If your monthly net (after tax) income is $ 1500,what should be your maximum amount spent on credit payments? a)$ 200 b)$300 c)$400 d)$500 IS B CORRECT ANSWER?THANK YOU:)))

    asked by vedrana
  21. science

    a current of 4a flows through a 12v headlight for 10min calculate energy transfered during this time

    asked by nik
  22. Chemistry

    Suppose that 30.0 mL of 0.20 M C6H5COOH(aq) is titrated with 0.30 M KOH(aq). Refer to table 1 and table 2. (a) What is the initial pH of the 0.20 M C6H5COOH(aq)? Using ICE i found to be 2.46 The rest I do not know how to set up or solve... (b) What is the

    asked by Val
  23. PHYSICAL CHEMISTRY

    For the equilibrium 2SO2(g) + O2(g) = 2SO3(g), what will change the value of Kp? A adding a catalyst B adding more O2 C increasing the pressure D increasing the temperature

    asked by HIMADITYA
  24. Chemistry

    State whether each of the following aqueous solutions would be acidic, basic, or neutral. Include appropriate net-ionic equations to show why a given solution is acidic or basic. a) NaNO3 b)KC6H5CO2 c)50:50 mixture of C6H5CO2H+KC6H5CO2 d)(CH3NH3)Cl e)50:50

    asked by Anonymous
  25. Physics

    In a laboratory experiment, one end of a horizontal string is tied to a support while the other end passes over a frictionless pulley and is tied to a 1.3 kg sphere. Students determine the frequencies of standing waves on the horizontal segment of the

    asked by Gabe
  26. moles of water produced?

    We mixed HCl and NaOH into water and got this table, all for trial 1 Here is all of the info for trial 1: trial 1: volume of 2 M NaOH used: 50.0 mL initial temperature of NaOH: 24.4 degrees C volume of 2 M HCl used: 50.0 mL initial temperature of HCl: 24.3

    asked by Abdullah
  27. Chemistry

    For the reaction, 2SO2(g) + O2(g) ¨ 2SO3(g) + heat, at equilibrium, what will be the effect on the net amount of SO3 present if the temperature of the container is increased? A) The concentration of SO3 decreases. B) The concentration of SO3 increases.

    asked by Natalie
  28. trig

    How do I solve for theta in tan theta = -1?

    asked by Matthew
  29. chemistry

    2H2 + O2 yield 2H2O to calculate bond enthalpy, we have to take bond breaking minus bond making, how do we know which one is bond breaking and bond making

    asked by bme1
  30. math

    Hey I need some help with this problem. Any ideas on how to solve it? Thanks lots. : A hardware supplier manufactures three kinds of clamps, types A, B and C. Production restrictions require them to make 10 units more type C clamps than the total of the

    asked by Jacob
  31. chem

    from the equation : c3h8+5O2=3CO2+4H20 HOW MANY GRAMS OF H2O CAN BE PRODUCED FROM THE REACTION OF 8.5X10^22 MOLECULES PROPANE GAS, C3H8

    asked by marina
  32. english

    the sentence--marsha speak excellent german should german be capitlized

    asked by jacob
  33. physics

    Short projectile motion question A German rocket from the second world war had a range of 3000meters reaching a maximum height of 1000meters. Determine the rockets maximum velocity

    asked by jake
  34. quimca

    Dibujar las estructuras de Lewis para los siguientes moléculas: a. IBr d. SiCl4 b. CH3Br e. OF2 c. C2HCl

    asked by doralis
  35. math

    one side of a right triangle has 2cm less than the hypothuse, and 7cm more than the third side what is the lenghnt of each side

    asked by devin
  36. Chemistry

    I am about to do an extraction experiment, and needed help with a question to improve my understanding. Any help appreciated. 1. You have 150 ml of a solution of benzoic acid in water estimated to contain about 5g of the acid. The distribution coeffcient

    asked by Natasha
  37. trig

    y=4cos(3x-2(3.14))

    asked by billy
  38. crt-205

    We gradually came to realize that equal protection really had to say that we can't discriminate in school attendance, and then beyond school attendance into many other fields. Is this a rhetorical device?

    asked by sam
  39. Corporate tax

    11. Molly, Inc. a domestic corporation, owns 15% of PJ. Inc. and 12% of Emma, Inc., both foreign corporations. Molly is paid gross dividends of $35,000 and $18,000 from PJ and Emma, respectively. PJ withheld and paid more than $10,500 in foreign taxes on

    asked by Lashay
  40. Spring Break

    Can I still ask you guys for help during the week of March 15-19? I have a feeling that you won't be available during the break.

    asked by AL 87
  41. Chemistry

    I have another similar problem. I have calculated everything given (Correctly), but I can't seem to get the right pH for the stoichiometric point (I keep getting 7.16) Question: Suppose that 50.0 mL of 0.25 M CH3NH2(aq) is titrated with 0.35 M HCl(aq).

    asked by Val
  42. Financial Engineering

    Describe a potential arbitrage strategy if a put price is the same as the negative of a forward if the strike are the same. You need to specify the number of units you would long/short for each instrument, initial cash flow, and final cash flow. An

    asked by Samuel
  43. math

    A balloon in the shape of a sphere is deflating. Given that t represents the time, in minutes, since it began losing air, the radius of the ballon (in cem) is r(t)=16-t. Let the equation V(r)= 4/3 pi r^3 represent the volume of a sphere of radius r. Find

    asked by andrea
  44. math

    Short projectile motion question A German rocket from the second world war had a range of 3000meters reaching a maximum height of 1000meters. Determine the rockets maximum velocity

    asked by devin
  45. Human Capital

    As a manager, explain the importance of understanding the controllable and uncontrollable financial affects on a business environment. What can you do to limit these financial constraints? What are some of the high cost items from a human resources

    asked by Wallace
  46. math

    Freddie Fast can make 6 4/5 chairs per hour on a furniture assembly line. Warren Weary makes 4 1/2 chairs per hour. In a 10-hour shift, how many more chairs does freddie make than warren? and if i may i would also like a small explanatation please i just

    asked by edward
  47. geometry

    I am trying to find the interior and exterior angles of a 9 sided polygon .

    asked by neil
  48. Thermo

    In an isothermal reaction (either reversible or irreversible), DELTA T is constant..hence zero since temperature remains constant, can we also assume that heat is also zero? if so, how then is an isothermal reaction different from an Adiabatic one?

    asked by Kim P
  49. Finance

    LaJolla Securities, Inc. specializes in the underwriting of small companies The terms of a recent offering were as follows: Number of shares 2 million Offering price $25 per share Net proceeds $45 million LaJolla Securities expenses, associated withthe

    asked by Nancy
  50. math

    In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful?

    asked by Anonymous
  51. social studies

    can someone please help me on creating a timeline on the major themes or paradigm shifts in american history from the columbus voyages through the mexican american war 1846-1848. I need some hel[ i have never done a timeline. If you can give me some

    asked by Dellaine
  52. Chemistry

    What substance is a better oxidizing agent in each of the following pairs? Explain. a) Co2+ or Cr3+ b) Mn2+ or I2 I think C02+ and I2 because they are above on the table. Is this correct or do I need more information in my answer?

    asked by Leanne
  53. geometry

    A triangel has sides 36 5/6 yards, 33 4/5 yards, 17 9/10 yards. What is the perimeter (distance around) of the triangel in yards? Write answer in mixed number form and reduce if possible

    asked by Queen
  54. Math

    Hi, I am doing a practice exam, and I came across this problem and I am have difficultly starting it. A UFO flies horizontally at a constant speed at an altitude of 15 km and passes directly over a tracking telescope on the ground. When the angle of

    asked by Anonymous
  55. Chemistry II (College)

    How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas

    asked by Tim
  56. Intro Chemistry

    An 0.6600 mol sample of an ionic compound has a mass of 131.9 g. Determine the mass (g) of one formula unit of the compound. I have no idea how to do the problem. I need help please, I'm reviewing for an exam. Thank You!

    asked by echem
  57. social studies

    Last 4 discuss the power of the states and procedures for amending the Constitution

    asked by mels
  58. SAT

    This is definitely not homework. I just want to know what would be the best book for preparing my self for the SAT.

    asked by Amir
  59. chemistry

    calculate the enthalpy change for the following (unbalanced equation) assume all reactants and products are in their standard states Fe2O3(s)+Al(s)---> Fe(s)+Al2O3(s) please answer me as soon as possible.

    asked by hrithik
  60. cell biology

    Why do the preparation of the medium in original paper of Eagle needs to put the salts in two different bottles for storage? I guess it has something related to valence but I can't put it in a clear way.

    asked by Holly
  61. sci 275

    Population Size Checkpoint

    asked by Anonymous
  62. physics

    If ball c slid down the hill without friction, how fast would it be traveling the instant it reached the bottom of the hill?

    asked by martin
  63. Chemistry II (College)

    How would I go about solving this problem? Can someone show me an equation that can be used? The decomposition of dimethyl ether at 504°C is a first-order reaction with a half-life of 27 min. (CH3)2O(g) CH4(g) + H2(g) + CO(g) What will be the total gas

    asked by Tim
  64. mat115

    Determine the maximum and minimum values of the following set of numbers. –12, 19, 12, 10, –24, 1, –1

    asked by Lynn
  65. chemistry

    How many moles of O2 are needed to combine with 0.646 mol Al to give Al2O3?

    asked by khin
  66. Political Sciences

    Consider the follow scenario: You are a criminal defense attorney, and your client has just been found guilty by the U.S. district court in Illinois. Respond in 200-300 words with these questions. What are your options for appeal? Describe the appeals

    asked by anonymous
  67. mat 115

    If $1,000.00 is deposited into an account paying 3% interest compounded annually (at the end of each year), how much money is in the account after 5 years? (Round to the nearest cent.) I cannot remeber the formula for this problem can you help

    asked by Mickey
  68. Math

    How do I find the derivative of sin^2(x) or written as sin(x)^2?

    asked by Anonymous
  69. art

    why did kenneth clarks interpretation of the aferican mask is ethnocentric

    asked by Brian
  70. history

    Create a five- to seven-point, bullet point list of the factors that led to political stalemate and the subsequent farmers’ revolt in the late 19th Century.

    asked by Anonymous
  71. maths

    1. Sphere C(-2,1,-3), radius=7. T plane at (4,-2,-1)=? (a) 6x-3y+2z=0 (b) r.(6,3,2)=28 (c) 5x-3y-2z=28 (d) r.(6/7,-3/7,2/7) 2. Sphere (x-1)²+(y-5)²+(z-2)²=49 and planr r.(-2,-6,-3)=0 form which circle?(a) (x-1)²+(y-5)²+(z-2)²=19.53 (b) C(0,0,0),

    asked by Anonymous
  72. Chemistry

    The titration of a 50.0 mL solution of the monoprotic bromoacetic acid (pKa = 3) takes 10 ml of 0.01 mol L-1 NaOH to reach the stoichiometric point. What was the initial concentration of bromoacetic acid? A) 0.02 mol/L B) 0.01 mol/L C) 0.002 mol/L D) 0.001

    asked by Connie
  73. physics

    100cm3 of air at 10 degree centigrade is heated to 80 degrees centigrade.What will be the new volume of the pressure that remains as atmospheric pressure?

    asked by alee
  74. Chemistry

    What is the heat outflow when 2kg of dry saturated steam at 8.0 bar is converted into ice at -10°C

    asked by Beata
  75. Chemistry

    Condensation occurs on a bathroom window at a rate of 0.5 kg per hour. If the bathroom air is at 26°C and fully saturated with water vapour, what is the rate of heat transfer on the window surface if the inside surface is maintained at 5°C.

    asked by Beata
  76. Calculus

    When f(x)= 2/x (4th power) - 7/x (2nd power) + 5 find the derivative

    asked by Pat
  77. History

    Which Native American tribe were the traditoinal alliis of New France

    asked by Kim
  78. learn 49 math

    a road trip has a scale of 5/8 inches for every 125 miles.. how many inches would be needed to represent 1000 miles on the map?

    asked by Ricardo
  79. math

    5 x (x + 2y) - (5x +2y) + y(2x + z) translate into a word phase.

    asked by emily
  80. Finance

    The Norman Company needs to raise $50 million of new equity capital. Its common stock is currently selling for $50 per share. The investment bankers require an underwriting spread of 3 percent of the offering price. The company's legal, accounting and

    asked by Nancy
  81. Finance

    LaJolla Securities Inc., specializes in the underwriting of small companies. The terms of a recent offering were as follows: Number of shares 2 million Offering price

    asked by Nancy
  82. government

    list of three federal government strategies of unification.

    asked by Anonymous
  83. Mat115

    Deterimie the max and min values of the following set of number -12, 19, 12, 10, -24,1,-1

    asked by Lynn
  84. mat115

    Perform the indicated operation. 11/7 - 6/7

    asked by Lynn
  85. chemistry

    How many moles of O2 are needed to combine with 0.646 mol Al to give Al2O3?

    asked by khin
  86. Math

    Find the simple interest on a loan of $100 at an interest rate of 2% for 7 years.

    asked by Julie
  87. english

    what is purpose in characteristics of interpersonal communication between a instructor and classmate

    asked by Anonymous
  88. physics

    1.calculate the commutators a/ [x^2,p^2] b/ [a,a^+n] I don't know how to solve it. Please help. I really appreciate.

    asked by bun
  89. maths

    The line r=(2,3,4)+µ(-1,0,3) and the point (6,0,2) form which plane: (a) r.(-1,0,3)=10 (b) r.(9,10,3)=60 (c) r.(2,3,4)=29 (d) r=(2,3,4)+µ(-1,0,3)+ù(6,0,2) Please help!!! Thanks!

    asked by Anonymous
  90. science

    what happens as a metal breaks? does the crystals of the crystal lines break? explain and make a sketch

    asked by Ernest
  91. social studies

    Who invented the ice box?

    asked by Michaela
  92. algebra 2 factoring

    3psqrt3-21psqrt2-p+7

    asked by justine
  93. History of Religion

    I have two questions for you and for both of these it would help to know something about the Roman Catholic Church in the past. Anyway, firstly, did dioceasan bishops always have to reside within the confines of their dioceases? Also, who was the first to

    asked by Miguel Santos
  94. SCI275

    creating and outline of the risk of using malathion according to the four steps of risk assessment presented in ch.4 figure 4.1

    asked by norma
  95. english

    i need help writing about a goddess that take cares of a lake or river.

    asked by Anonymous
  96. Bio 2

    Why was the recapitulation theory really exciting for everyone back then? And now we don't even have it mentioned in our biology books...

    asked by Nina J
  97. chemistry

    If I have a set of data that gives the apparent partition coefficient as a function of pH, over a range of pH 2-10, how do I calculate the Ka of the compound?

    asked by Renee
  98. english

    What factors should be used to determine a playwright's target audience?

    asked by Terri
  99. Biology

    Need help with this-- 16. The exoskeleton of an insect a. does not have any muscles attached to it b. is moved by muscles that are attached to the inside of the exoskeleton c. is thickest where the joints of the appendages are located d. is moved only by

    asked by mysterychicken
  100. Mat115

    Subtract 7/9 - (-13/18)

    asked by Lynn
  101. math

    x^2-8x+16

    asked by lauren
  102. Imagery

    I need help finding an image that illustrates LIFE. Any suggestions?

    asked by Steph
  103. Math

    Do you know where I can find a list of all the formulas? Like for volume of a cone, sphere, areas, etc?

    asked by Anonymous
  104. Math

    Solve using long division 0.5 ÷ 0.02

    asked by Natatlie
  105. Economics

    Would a change in money supply shift the LAS curve?

    asked by Rach
  106. Math

    How would I find the formual of power function out of these 2 point? (5,75)(10,600)

    asked by Jonathan
  107. 11th grade

    convert into moles 1.44*10^25 atoms C = ? moles C

    asked by Anonymous
  108. computers

    i need this decrypted if anyone can help that would be great 1b4a045c34a0573ca57657a1021dc171

    asked by David
  109. Economics

    Would a reason the aggregate demand curve shifts downward be because of: A lower price level decreases consumption?

    asked by Rach