Posts by dan

Total # Posts: 1,225

  1. AP CHEMISTRY

    I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: ...
  2. AP CHEMISTRY

    I really need this please!!!!!!! : write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: ...
  3. Geometry

    THINK IT'S: 2x^2-8x=0 2x(x-4)=0 x=0 or x= 4
  4. AP CHEMISTRY

    i added info in the last question in AP CHEMISTRY
  5. AP CHEMISTRY

    ........ deltaHf(KJ/mol)...... d.Gf(KJ/mol)..... d.S(J/mol-K) NaHCO3(s) -947.7...... -851.8 ......... 102.1 NaOH(s).. -425.6 ...... -379.5 ........ 64.46 CO2(g) .. -393.5 ...... -394.4 ........ 213.6 Hope that helps
  6. AP CHEMISTRY

    write the equilibrium-constant expression and calculate the value of the equilibrium constant for each of the following reactions at 298 K. (a) NaHCO3(s)<--> NaOH(s) + CO2(g) Answer: Keq = PCO2 (b)Value of the Equilibrium Constant: Please help me find B
  7. math

    the lateral area of a pyramid that has a base 6 and height 8?
  8. geometry

    wat is lateral area if base is 6 and the right angle is 8
  9. PHI103

    strongly supported claim in science should be regarded as? necessarily true correct, but can always be revised
  10. PHI103

    @Ms Sue Thanks you make perfectly good sense. You "should" give yourself a pat on the back!
  11. trig

    If sec theta = radical 5, what is the exact value of cos theta
  12. trig

    If sec theta = radical 5, what is the exact value of cos theta
  13. Chemistry

    Calculate the equivalent mass of each of the following acids. a) HC2H3O2 b) KHCO3 c) H2SO3
  14. US HISTORY

    I need to end an essay on prohibition era and these are my subtopics: crimes, laws, and prohibition movements
  15. US HISTORY

    is there a limited amount on how much alcohol an industry can produce???
  16. Chemistry

    Mastering chemistry homework? Haha. E^(zero)cell= Cathode-Anode E^(zero)cell= 0.82V-.22V= 0.6V Delta G= -n*F*E^(zero)cell Delta G= -4*96485*0.6 Delta G= -231.564 J or -232 kJ
  17. General Chemistry 1

    Gaseous hydrocarbons, which contain only carbon and hydrogen, are good fuels because they burn in air to generate large amounts of heat. A sample of hydrocarbon with mass 1.48 g exerts a pressure of 1.32 atm in bulb with volume 967 mL at 21.5 oC. Molar Mass of this hydrocarbon...
  18. AP CHEMISTRY

    A 1.00-L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C.
  19. Chemistry

    pH = pKa + log([A-]/[HA])
  20. World History! help please :)

    It connects the black Sea to the Sea of Marmara. so your answer is accurate
  21. AP CHEMISTRY

    thanx
  22. AP CHEMISTRY

    Calculate the pH at the equivalence point in titrating 0.100 M solutions of each of the following with 0.080 M NaOH. A) benzoic acid (C6H5COOH) Ka= 6.3*10^-5 for it
  23. ALGEBRA II

    factor (2x^2 - 48)
  24. Trig

    A pilot is flying over a straight highway. He determines the angles of depression to two mileposts, 3 mi apart, to be angle x = 31° and angle y = 49°, as shown in the figure. (Round your answers to two decimal places.) Find the distance of the plane from point A. Find ...
  25. ALGEBRA II

    George jogged downhill at 6mi/hr and then jogged back up at at 4mi/hr. If the total jogging time was 1.25 hours, how far did he jog in all?
  26. ALGEBRA II

    does b=2???
  27. ALGEBRA II

    (3b-2)/(b+1) = (4)- (b+2)/(b-1) The (b+2)/(b-1) is separate from the 4. the 4 isn't included in the division
  28. logic application

    I need help on figuring why this is the answer. 4,5,9. i see how it all adds up.. but i am stuck on the over all reasoning
  29. US HISTORY

    clincher sentence on prohibition era. I want the reader to feel that they want to read more
  30. US HISTORY

    Could someone help me conclude an essay on prohibition. I am writing: even though there were laws and movements for prohibition, it actually didn't work. PLEASE HELPPP!!!
  31. US HISTORY

    could u tell how?? please
  32. US HISTORY

    is the temperance movement still in affect today?
  33. US HISTORY

    THANX !!!
  34. US HISTORY

    Anyone have a good informational website on temperance movement during the prohibition era.
  35. ENGLISH 10

    how the organized crimes expanded and the importance of it
  36. ENGLISH 10

    I need a thesis statement on the crimes of prohibition era
  37. Numerical Methods

    Derive the following formulas using Taylor series and then establish the error terms for each. f'(x) approx= (1/2*h)[4f(x+h)-3f(x)-f(x+2h)] f'(x) approx= (1/4*h)[f(x+2h)-f(x-2h)]
  38. AP CHEMISTRY

    U guys r no helpp!!!!!!!!!!!!! booooooooooooooooooooooooooooooooooooooooo!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
  39. AP CHEMISTRY

    Write the formula for each of the following compounds, being sure to use brackets to indicate the coordination sphere. 1) bis(bipyridyl)cadmium(II) chloride 2)potassium tetrabromo(ortho-phenanthroline)- cobaltate(III)
  40. law

    • What is the role of police in society? What would happen if the role of the police were lessened as it applies to the theory and practice of community policing?
  41. US HISTORY

    What other laws were passed during the prohibition era. (EXCLUDING the 18Th amendment and Volstead act) THANX
  42. US HISTORY

    what laws were passed because of temperance movement. Or what did the government do because of the temperance movement (Prohibition era). Thanks!
  43. US HISTORY

    thank u
  44. US HISTORY

    Where did Prohibition Strongly take place and what were the major developments
  45. US HISTORY

    How Does prohibition era affect today life
  46. french

    thank you
  47. french

    Please can you check the following, thankyou. je vais acheter tu vas acheter il/elle acheter nous allons acheter vous allez acheter ils/elles vont acheter je acheterai tu acheteras il/elle achetera nous acheterons vous acheterez ils/elles acheteront i have to do the same for ...
  48. physics

    The car has a mass of 1200kg Calculate the kinetic of the car when it travels at a speed of 12 m/s.
  49. math

    In the 17th century, there were more than 800,000 inhabitants of Paris. At the time, it was believed that no one had more than 200,000 hairs on their head. Assuming these numbers are correct and that everyone has at least 1 hair on their head, show that there had to be two ...
  50. physics

    our objects are situated along the y axis as follows: a 1.94 kg object is at +3.27 m, a 2.76 kg object is at +2.18 m, a 2.78 kg object is at the origin, and a 3.99 kg object is at -0.360 m. Where is the center of gravity of this system?
  51. physics

    You pick up a board of length 2.60 m and mass 13.00 kg. To do this, you exert a force upward with your left hand a distance LL=0.754 m from the left end of the board and you need to exert a force with your right hand a distance LR=0.264 m from the left end of the board. Assume...
  52. Chem

    How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization ...
  53. math

    i need to find the answer for 964837 x 465
  54. stats

    A final exam in Math 160 has a mean of 73 with standard deviation 7.73. Assume that a random sample of 24 students is selected and the test score of the sample is computed. Assuming the scores are normally distributed, what percentage of sample means are less than 69?
  55. statistics

    A researcher wishes to estimate the mean height of women aged between 60 and 65 in the US. She desires a margin of error of 0.2 inches. Past studies suggest that a population standard deviation deviation of 3.2 inches is reasonable. Estimate the minimum sample size needed to ...
  56. math

    63
  57. physics

    CHICKEN NUGGETS = GOLDEN TAR
  58. physics

    What is the pressure at the bottom of a river (12 m deep) if the air pressure over the river is 98.23 kPa? The density of the river water is 988 kg/m3.
  59. physics

    What is the pressure at the bottom of a river (12 m deep) if the air pressure over the river is 98.23 kPa? The density of the river water is 988 kg/m3.
  60. Spanishanother question

    5. También yo recibí/he recibido muchos regalos de mi familia.
  61. Physics

    v = u + a*t so t = (v-u)/a x = t (v+u)/2 substituting for t, x = (v+u)(v-u)/2a put in known values: 13 = (5)(-5)/2a a = -25/26 m/s^2 f = m*a u(k) * f(normal) = m*a u(k) *m*g = m*a u(k) = a/g u(k) = -25/26 /9.81 = 0.098 where u(k) = coefficient of friction for magnitude of ...
  62. physics

    One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
  63. physics

    One dimension. In Fig. 13-32, two point particles are fixed on an x axis separated by distance d. Particle A has mass mA and particle B has mass 4.00 mA. A third particle C, of mass 80.0 mA, is to be placed on the x axis and near particles A and B. In terms of distance d, at ...
  64. Physics

    You have a 2.4 m high platform that is level on top. A spring launcher is located on the top so that it launches objects horizontally. You want to launch a 0.70 kg ball so that it hits at target on the ground 6.0 m away from the base. If the spring constant is 500 N/m, what ...
  65. algebra

    if the lengths of a triangle are y, y-1 and 7 what is the length of the longest side if the perimeter is 65
  66. Physics

    What is the angular momentum (in kg*m*m/s) of a 790 gram symmetrical rotating bar which is 2.85 m long and spinning at 245 rpm about the center of the bar?
  67. organic chemistry

    Could you use NaOH to separate acetylsalicylic acid (aspirin) and acetaminophen (Tylenol) by acid-base extraction?
  68. spanish

    I have to translate this to indirect style is this correct? Original:Pero cien años después, las personas negras todavía no son libres. Cien años después, la vida de las personas negras sigue todavía tristemente atenazada por los ...
  69. Physics

    A 72.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe", a track that is one-quarter of a circle with a radius of 4.65 m. What speed (in m/s) does he need at the bottom assuming that the local acceleration due to gravity is 9.80 m/s2?
  70. n/a

    Is it not possible to talk to tutors or students directly?
  71. Math

    company is considering offering child care for their employees. They wish to estimate the mean weekly child-care cost of their employees. A sample of 10 employees reveals the following amounts spent last week in dollars.
  72. Physics

    A 72.0 kg skateboarder wants to just make it to the upper edge of a "quarter pipe", a track that is one-quarter of a circle with a radius of 4.65 m. What speed (in m/s) does he need at the bottom assuming that the local acceleration due to gravity is 9.80 m/s2?
  73. Physics, help with a similar problem I just posted

    I posted a the same problem with different numbers a minute ago. The answer to the problem below (same as the other with different numbers) is 28 degrees. Maybe this will help to solve it? Thanks! A block is hung by a string from the inside roof of a van. When the van goes ...
  74. physics

    A block is hung by a string from the inside roof of a van. When the van goes straight ahead at a speed of 28.9 m/s, the block hangs vertically down. But when the van maintains this same speed around an unbanked curve (radius = 144 m), the block swings toward the outside of the...
  75. Physics

    A 9.60 g coin is placed 10.7 cm from the center of a turntable. The coin has a coefficient of static friction of 0.80 and a coefficient of kinetic friction of 0.60 with the turntable. The turntable's angular velocity slowly speeds up until the coin starts to slide off. ...
  76. german

    [german] Sie sind sehr hübsch. = [en] You (formal) are very beautiful.
  77. physics

    a runner run halfway around a circular track whose radius is 60 meters in 45 secs what is the average velocity? what is the average speed?
  78. Physics

    light travels at a constant speed of 3x10*11 cm/sec. how long does it take light to reach the earth a distance of 1.5x10*8 km. give the answers in seconds and minutes.
  79. Chemistry

    when testing for antimony, what reagent prevents tin from reacting with the H2S to form SnS2? What reagent is used to identify copper and explain its function.
  80. Chemistry

    thanks i wish they were in my book
  81. informal Logic

    correct, but something that can always be revised? But can't find the exact answer in text, urrrg!
  82. physics

    A thin 2kg box rests on a 6kg board 50cm long with 20cm hanging off the edge of a table. How far can the center of the box be from the end of the table before the board begins to tilt?
  83. Physics

    Compressed air is used to fire a 41.0 g ball vertically upward from a 1.0-m-tall tube. The air exerts an upward force of 3.7 N on the ball as long as it is in the tube. How high (in m) does the ball go above the top of the tube, assuming that the acceleration due to gravity is...
  84. Algebra Question 1

    business A=x business B=2x-20 business C=2x-20+2(2x-20)-200 x+2x-20+2(2x-20)-200=1035 x+2x-20+4x-40-200=1035 7x=1035+20+40+200 7x=1295 x=185 Bus. A pledged $185 million Bus. B pledged 185x2=370-20=350 million Bus. C pledged 350x2=700-200=500million 185+350+500= $1035 million
  85. math

    You round down and say 500*3 which is 1500 then go 600*3 which is 1800. The number is between 1500 and 1800.
  86. Physics

    No idea
  87. Physics

    A car is traveling at 95km/hr when it collides with a stone wall. The car comes to rest after the first 30 cm of the car is crushed.what was the average horizontal force acting on a 68.1 kg driver while the car came to rest? If 5 cardboard boxes each 1.25 m wide and filled ...
  88. german

    1. Paragraph about some event in the past and how I reflect on it - What do you want to write about? - What don't you know? 2. Wetter - vocabulary? 3. Jahreszeiten - Frühling, Sommer, Herbst und Winter? 4. Partizip - mit|machen - auf|passen - an|kommen - ein|fliegen...
  89. trig

    The captain of a ship at sea sights a lighthouse which is 120 feet tall. The captain measures the the angle of elevation to the top of the lighthouse to be 19 ^\circ. How far is the ship from the base of the lighthouse?
  90. physics

    In the figure below, m1 = 10.0 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60, and the coefficient of kinetic friction is 0.30. m1 is on a table connected to m2 by a string that is on a pulley. m2 is hanging off the table ...
  91. algebra

    a purse contains 26 coins, some of which are dimes and the rest are nickels. Altogether, the coins are worth more than $2.10. At least how many dimes are in the purse?
  92. physics

    A truck at rest at a stoplight accelerates uniformly with acceleration a = 9 meters/second2 for 6.8 seconds after the light turns green. What is the speed of the truck in meters/second after that time interval?
  93. geometry

    if B is the midpoint of AC=1/2AC
  94. geometry

    g is between f and h. fh=8x,fg=6x+7, and gh+28. find fh
  95. algebra

    simplify 8-(y-1)-(10-4y)
  96. physics

    A = 51.15 V= 638.8
  97. physics

    correct me if im wrong solve for a = 102 and v = 1249
  98. physics

    ok i get
  99. physics

    where did you get the 144
  100. physics

    a uniformly accelerating train passes a green light signal at25.0 km/hr it passes a second light 125m farther down the track 12.0s later what is the trains acceleration? what is the trains velocity at the second light?
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